High clarity polyurethane laminating adhesives based on poly(propylene glycol). Effect of hard segment on microphase morphology, haze and adhesion was written by McCreath, S.;Boinard, P.;Boinard, E.;Gritter, P.;Liggat, J. J.. And the article was included in International Journal of Adhesion and Adhesives in 2022.Recommanded Product: 57-55-6 This article mentions the following:
A series of polyurethanes were prepared, with poly(propylene glycol) used as soft-phase due to the high clarity of this polyol and absence of carbonyl functionality, which allows for hard-phase architecture to be resolved with greater resolution In total, eight adhesives were synthesized, each contained a different chain-extender formulation to gauge what influence hard-phase architecture had on laminate haze and peel strength. This was investigated using either 4,4-methylene di-Ph diisocyanate or isophorone diisocyanate as hard-phase with trimethylolpropane as the only chain-extender or by including one of the following sterically hindered diols: 2,2-diethyl-1,3-propane diol, 1,3-butane diol or 1,2-propane diol. DSC anal. showed that microphase morphol. was strongly influenced by the diisocyanate present, as shown by the degree of phase mixing being greater in methylene di-Ph diisocyanate based formulations when compared with isophorone diisocyanate based. This resulted in higher haze values being encountered for both polycarbonate and ethanolamine surface-treated polycarbonate laminates which contained methylene di-Ph diisocyanate based formulations when compared to isophorone diisocyanate based formulations, where all values were <1.5%. In the experiment, the researchers used many compounds, for example, 1,2-Propanediol (cas: 57-55-6Recommanded Product: 57-55-6).
1,2-Propanediol (cas: 57-55-6) belongs to alcohols. Similar to water, an alcohol can be pictured as having an sp3 hybridized tetrahedral oxygen atom with nonbonding pairs of electrons occupying two of the four sp3 hybrid orbitals. Under carefully controlled conditions, simple alcohols can undergo intermolecular dehydration to give ethers. This reaction is effective only with methanol, ethanol, and other simple primary alcohols.Recommanded Product: 57-55-6
Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts