Tag: M.W=400-500

Abdelrahman, Mustafa K. published the artcileEmergent Surface Topography Enabled by Concurrent Crystallization and Polymerization, Synthetic Route of 7575-23-7, the main research area is emergent surface topog enabled concurrent crystallization polymerization.

Materials with dynamic surface topog. may enable a variety of new technologies from smart coatings to biomaterials with controlled cell-material interaction. However, current approaches to create morphing surfaces require programming procedures, either before or after polymerization, that complicate the application of these materials. Here, we exploit the metastability of the microstructure of semicrystalline polymer networks that crystallize while photopolymerizing to create polymer coatings and microstructures that irreversibly morph from smooth to rough in an emergent manner when heated. For example, a smooth polymer coating with a root-mean-square (Rq) roughness of 15 nm transforms into a rough film with a Rq roughness of 688 nm on heating through the melt temperature We show that this behavior is observed across a range of polymer networks and that the degree of undercooling during polymerization is the primary factor that controls the magnitude of roughness. This technique is not limited to polymer films; microstructures fabricated utilizing micromolding or emulsion polymerization also undergo changes in roughness on heating. Finally, we discuss using this approach to create polymer structures with spatiotemporal control of coefficients of friction and contact angles.

Macromolecules (Washington, DC, United States) published new progress about Contact angle. 7575-23-7 belongs to class alcohols-buliding-blocks, name is Pentaerythritol tetra(3-mercaptopropionate), and the molecular formula is C17H28O8S4, Synthetic Route of 7575-23-7.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

Kim, Myung-Jin published the artcileControlling the gate dielectric properties of vinyl-addition polynorbornene copolymers via thiol-ene click chemistry for organic field-effect transistors, Formula: C17H28O8S4, the main research area is gate dielec vinyl polynorbornene thiol click organic field transistor.

A simple way to control the gate dielec. properties of vinyl-addition polynorbornene copolymers bearing pendant vinyl groups (P(NB/VNB)) through thiol-ene click chem. is reported. The optimized content ratio of tetra-thiol cross-linkers leads to the enhanced gate dielec. properties and performance of organic field-effect transistors. Also, this approach provides photo-patternability, low-temperature solution-processing, and air-processability.

Journal of Materials Chemistry C: Materials for Optical and Electronic Devices published new progress about Contact angle. 7575-23-7 belongs to class alcohols-buliding-blocks, name is Pentaerythritol tetra(3-mercaptopropionate), and the molecular formula is C17H28O8S4, Formula: C17H28O8S4.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

Jeong, Songah published the artcileHierarchical Design of Functional, Fibrous, and Microporous Polymer Monoliths for the Molecular Recognition of Diethylstilbestrol, COA of Formula: C17H28O8S4, the main research area is hierarchical fibrous microporous polymer mol recognition diethylstilbestrol; endocrine disruptor mol recognition.

This paper demonstrates the hierarchical design of functional, fibrous polymer monoliths. The monoliths are composed of conjugated microporous polymers that not only are embedded with heteroatoms but also feature fibrous yet compressible structures due to the in situ self-assembly process that occurs during the polymerization process. Therefore, the doped nitrogen atoms can allow the growth of zeolitic imidazolate framework (ZIF) nanocrystals, which causes the homogeneous encapsulation of individual fibers. The resulting hybrid monoliths exhibit enhanced phys. properties as well as catalytic activity, allowing the formation of an addnl. coating layer via a thiol-epoxy reaction. The deliberate inclusion of template mols. during the reaction forms molecularly imprinted sites on the fibers to afford functional monoliths. As a proof of concept, the hierarchically designed materials are able to show effective recognition properties toward diethylstilbestrol, an endocrine disruptor, taking advantage of the binding sites that selectively capture the analyte mols. and the fibrous morphol. that increases the accessibility of these binding sites. We envisage that the incorporation of various heteroatoms or nanocrystals will bring about the bespoke design of advanced monoliths with autonomous functions, leading to smart textile systems.

Analytical Chemistry (Washington, DC, United States) published new progress about Contact angle. 7575-23-7 belongs to class alcohols-buliding-blocks, name is Pentaerythritol tetra(3-mercaptopropionate), and the molecular formula is C17H28O8S4, COA of Formula: C17H28O8S4.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

Liang, Ziwei published the artcileArbitrarily and repeatedly programmable multi-layer soft actuators via “”stress-caching””, Related Products of alcohols-buliding-blocks, the main research area is multilayer shape memory material.

Multi-layered strategy is prevalent in actuator fabrication since only a mismatch of geometric changing between layer(s) under the external stimulus is required, allowing to avoid meticulous mol. synthesis. Nonetheless, their actuation manners are usually limited to simple bending, of which the direction as well as amplitude are not (re)programmable after synthesis. Here, an arbitrarily and repeatedly programmable multi-layered actuator via “”stress-caching””, where a shape memory polymer (SMP) is sandwiched with two coated hydrogel layers, is presented. Via varying the swelling/de-swelling degree between the top and bottom hydrogel layers, the designed internal stress, determining the bending direction and angle, was stored within the actuator due to the constraint of the rigid SMP layer. Upon heating, the release of the cached stress induced a “”snap-like”” fast actuation and the resultant geometry can be designed, preserved or recovered on demand. Addnl., the flame-retardant hydrogel layers safeguarded the actuator to work at high temperatures (even directly exposed to flame), ensuring potential applications in a fire-rescuing scenario as demonstrated. Thus, our stress-caching approach shall diversify the designs of actuator since other myriad smart materials with distinct responsiveness and functionality can be straightforwardly employed.

Chemical Engineering Journal (Amsterdam, Netherlands) published new progress about Contact angle. 7575-23-7 belongs to class alcohols-buliding-blocks, name is Pentaerythritol tetra(3-mercaptopropionate), and the molecular formula is C17H28O8S4, Related Products of alcohols-buliding-blocks.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

Lazauskas, Algirdas published the artcileTrilayer Composite System Based on SiO2, Thiol-Ene, and PEDOT:PSS. Focus on Stability after Thermal Treatment and Solar Irradiance, SDS of cas: 7575-23-7, the main research area is trilayer composite system thermal treatment stability solar irradiance; PEDOT:PSS; SiO2; composite; solar irradiance; stability; thermal; thiol-ene; trilayer.

The trilayer composite was fabricated by combining functional layers of fumed SiO2, thiol-ene, and poly(3,4-ethylenedioxythiophene) poly(styrenesulfonate) (PEDOT-PSS). Optical, scratch-healing, non-wetting, and elec. stability was investigated at different instances of time after thermal and solar irradiance treatment. The trilayer composite was found to be optically stable and highly transparent for visible light after thermal and irradiance treatment for 25 h. Both treatment processes had a minor effect on the shape-memory assisted scratch-healing performance of the trilayer composite. Thermal treatment and solar irradiance did not affect the superhydrophobic properties (contact angle 170 ± 1°) of the trilayer composite. The sheet resistance increased from 90 ± 3 Ω/square (initial) to 109 ± 3 Ω/square (thermal) and 149 ± 3 Ω/square (irradiance) after 25 h of treatment, which was considered as not significant change.

Polymers (Basel, Switzerland) published new progress about Contact angle. 7575-23-7 belongs to class alcohols-buliding-blocks, name is Pentaerythritol tetra(3-mercaptopropionate), and the molecular formula is C17H28O8S4, SDS of cas: 7575-23-7.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

Talanikar, Aniket A. published the artcilePost-polymerization modifiable aromatic (co)poly(ether sulfone)s possessing pendant norbornenyl groups based upon a new bisphenol, Application of Pentaerythritol tetra(3-mercaptopropionate), the main research area is polyether sulfone preparation thiol ene modification thermal property.

A new bisphenol possessing pendant norbornenyl group viz., 4, 4′-(bicyclo (2.2.1) hept-5-en-2 yl methylene) bis (2-methoxyphenol) (BPA-NB) was synthesized by a single-step base-catalyzed condensation reaction of 5-norbornene-2-carboxaldehyde with guaiacol. NMR spectral data indicated formation of BPA-NB comprising of isomeric components. A series of (co)poly(ether sulfone)s possessing pendant norbornenyl groups was synthesized by nucleophilic aromatic substitution polycondensation of varying molar ratio of BPA-NB and bisphenol-A (BPA) with bis(4-fluorophenyl) sulfone. Inherent viscosity values and number average mol. weights of (co)poly(ether sulfone)s were in the range 0.67-1.01 dL/g and 75,400-1,16,300 g/mol, resp. indicating the formation of reasonably high mol. weight polymers. Tough, transparent, and flexible films could be cast from chloroform solutions of these (co)poly(ether sulfone)s. (Co)poly(ether sulfone)s were characterized using FT-IR, 1H NMR and 13C NMR spectroscopy, XRD, TGA and DSC anal. The formation of random copoly(ether sulfone)s was demonstrated by 13C NMR anal. The incorporation of BPA-NB into (co)poly(ether sulfone)s resulted into improvement in Tg values. BPA-NB-based (co)poly(ether sulfone)s offered possibilities for post-modifications involving either methoxyl or norbornenyl groups. A representative copoly(ether sulfone) (PSU-NB-2) possessing pendant norbornenyl groups was chem. modified via thiol-ene reaction with three representative thiol compounds, namely, 1-dodecanethiol, 2-furanmethanethiol and 2-mercaptoethanol to yield corresponding post-modified polymers in a quant. manner. Addnl., it was demonstrated that copoly(ether sulfone) possessing pendant norbornenyl groups could be used to form insoluble cross-linked gel in the presence of a multifunctional thiol cross-linker.

European Polymer Journal published new progress about Crystallinity. 7575-23-7 belongs to class alcohols-buliding-blocks, name is Pentaerythritol tetra(3-mercaptopropionate), and the molecular formula is C17H28O8S4, Application of Pentaerythritol tetra(3-mercaptopropionate).

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

He, Jing published the artcileUncovering the Polydisperse Characteristics of Modification Inhomogeneity for Starch during Oxidation by Sodium Periodate, Name: Pentaerythritol tetra(3-mercaptopropionate), the main research area is uncovering polydisperse inhomogeneity starch oxidation sodium periodate.

Revealing the modification inhomogeneity at the mol. level is important to understand the structure-property relationship for polysaccharide derivatives Herein, we report a study to uncover the polydisperse characteristics of inhomogeneity in both the chem. composition and mol. structure of dialdehyde starch (DA-starch) prepared by heterogeneous oxidation Based on the difference in the ratio (r) of refractive and absorbance index increments or absorbance index increments at two different wavelengths for modified and intact units, we have developed a universal theor. method to analyze the microscopic chem. composition of each fraction, which has been proved to show high accuracy (relative deviation within ±2%) by analyzing the exptl. data using quadruple-detection size-exclusion chromatog. In particular, the result has demonstrated that the degree of modification is much lower for DA-starch chains with larger mol. sizes and higher molar masses. In addition, by analyzing the polydisperse characteristics of inhomogeneity in the mol. structure, we have revealed the slight change of size-mass scaling relation; to be specific, starch macromols. are oxidized and degraded to less branched DA-starch fragments. We believe that the present study provides a fresh perspective regarding the modification inhomogeneity of polysaccharide derivatives, which is useful for practical industry applications.

Macromolecules (Washington, DC, United States) published new progress about Crystallinity. 7575-23-7 belongs to class alcohols-buliding-blocks, name is Pentaerythritol tetra(3-mercaptopropionate), and the molecular formula is C17H28O8S4, Name: Pentaerythritol tetra(3-mercaptopropionate).

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

Tonga, Murat published the artcileA facile strategy for the development of n-type carbon nanotube composites with tunable thermoelectric properties via thiol-ene chemistry, HPLC of Formula: 7575-23-7, the main research area is thiolene n type carbon nanotube composite thermoelec property.

This work exploits thiol-ene chem. for the development of carbon nanotubes (CNTs) -based, solution-processed, and flexible thermoelec. (TE) composites. A systematic study was implemented by optimizing many aspects: (i) use of π-conjugated vs non-conjugated linkers, (ii) amount and type of CNTs (SWNT vs MWNT) in the composite, and (iii) doping. The resulting samples revealed that the materials exhibited n-type semiconducting behavior without requiring a doping process and attained power factors (PF) up to 1.1 μW m-1 K-2. It was also found that the composites made with non-conjugated linkers showed better TE performance than that of π-conjugated linkers. Besides n-type materials, this methodol. is also capable of producing p-type materials, and n-type materials can also convert to p-type upon doping exposure. A variety of distinct surface morphologies with segregated structures were observed on SEM (SEM). The methodol. which has been benefited here relies on the factors beyond just the blend composition or type of CNTs used, including the specific structure of the linkers, doping process, and the morphol. resulting from the crosslinking composites.

Polymer published new progress about Carbon nanotubes. 7575-23-7 belongs to class alcohols-buliding-blocks, name is Pentaerythritol tetra(3-mercaptopropionate), and the molecular formula is C17H28O8S4, HPLC of Formula: 7575-23-7.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

Tang, Longhao published the artcileEffects of modified carbon nanotubes with different sizes on properties of epoxy shape memory polymers, SDS of cas: 7575-23-7, the main research area is carbon nanotube epoxy shape memory polymer property.

Shape memory polymers (SMPs) have occupied an important role in material application, in which the contribution of various fillers on the enhancement of their low mech. and thermal properties is indispensable. Lots of excellent researches on carbon nanotubes improving comprehensive performance have been accomplished, while few comparative studies about carbon nanotubes with different sizes. In the present study, epoxy shape memory composites of multi-walled carbon nanotubes/epoxy matrix (MWCNTs/epoxy) were prepared, in which MWCNTs with different sizes modified through epoxidation act as enhancement filler. The results indicated that MWCNTs with smaller size possess an efficient effect on improving mech. properties, and MWCNTs with larger size achieve higher enhancement on increasing heat resistance as the filler content is low (0.1%, 0.2%). Furthermore, the effect of MWCNTs on shape recovery ratio and shape recovery speed of composites has also been systematically investigated.

Polymer Composites published new progress about Carbon nanotubes. 7575-23-7 belongs to class alcohols-buliding-blocks, name is Pentaerythritol tetra(3-mercaptopropionate), and the molecular formula is C17H28O8S4, SDS of cas: 7575-23-7.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

Warner, John J. published the artcile3D printable non-isocyanate polyurethanes with tunable material properties, Product Details of C17H28O8S4, the main research area is printable nonisocyanate polyurethane tunable material property.

Green chem.-based non-isocyanate polyurethanes (NIPU) are synthesized and 3D-printed via rapid, projection photopolymerization into compliant mechanisms of 3D structure with spatially-localized material properties. Trimethylolpropane allyl ether-cyclic carbonate is used to couple the unique properties of two types of reaction chem.: (1) primary diamine-cyclic carbonate ring-opening conjugation for supplanting conventional isocyanate-polyol reactions in creating urethane groups, with the addnl. advantage of enabling modular segment interchangeability within the diurethane prepolymers; and (2) thiol-ene (click) conjugation for non-telechelic, low monodispersity, quasi-crystalline-capable, and alternating step-growth co-photopolymerization The extent of how these processes utilize mol. tunability to affect material properties were investigated through measurement-based comparison of the various polymer compositions: frequency-related dynamic mech. anal., tension-related elastic-deformation mech. anal., and material swelling anal. Stained murine myoblasts cultured on NIPU slabs were evaluated via fluorescent microscopy for “”green-chem.”” affects on cytocompatibility and cell adhesion to assess potential biofouling resistance. 3D multi-material structures with micro-features were printed, thus demonstrating the capability to spatially pattern different NIPU materials in a controlled manner and build compliant mechanisms.

Polymer Chemistry published new progress about Copolymerization. 7575-23-7 belongs to class alcohols-buliding-blocks, name is Pentaerythritol tetra(3-mercaptopropionate), and the molecular formula is C17H28O8S4, Product Details of C17H28O8S4.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts