Effect of monomer structure on crystallization and glass transition of flexible copolyesters was written by Pan, Chengqian;Lu, Jing;Wu, Binshuang;Wu, Linbo;Li, Bo-Geng. And the article was included in Journal of Polymers and the Environment in 2017.Electric Literature of C9H20O2 The following contents are mentioned in the article:
Amorphous flexible (co)polyesters with low glass transition temperature (Tg) are very desirable in impact modification of biodegradable brittle polymers and synthesis of biodegradable elastomers. However, most flexible polyesters and binary copolyesters made from linear diacid(s) and diol(s) are crystalline polymers. In order to investigate the effect of monomer structure on the crystallization and Tg of such copolyesters, novel ternary or multiple flexible copolyesters containing various structural units were designed and synthesized in this study, and characterized with 1HNMR, GPC, DSC, WAXD, TGA and tensile testing. Introducing aromatic diacid (especially asym. one) or short-chain branched diol is favorable to depress copolyester crystallization, and leads to higher Tg at the same time. From easily crystallized to fully amorphous copolyesters with low Tg were successfully synthesized by adopting different combination of structural units. In addition, the existence of aromatic structural unit in copolyesters is helpful to improve their tensile properties. Graphical Abstract: Flexible copolyesters containing various structural units were designed and synthesized. Introducing asym., rigid aromatic or short-chain branched unit is favorable to depress copolyester crystallization, and leads to higher Tg at the same time. Crystalline to fully amorphous copolyesters with low enough Tg have been successfully synthesized by adjusting the structural units. This study involved multiple reactions and reactants, such as 2-Butyl-2-ethylpropane-1,3-diol (cas: 115-84-4Electric Literature of C9H20O2).
2-Butyl-2-ethylpropane-1,3-diol (cas: 115-84-4) belongs to alcohols. Alcohols are weak acids. The most acidic simple alcohols (methanol and ethanol) are about as acidic as water, and most other alcohols are somewhat less acidic. Grignard and organolithium reagents are powerful tools for organic synthesis, and the most common products of their reactions are alcohols.Electric Literature of C9H20O2
Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts