Dynamic mechanical properties of poly(tetramethylene ether) glycol polyurethanes: effect of diol-chain extender structure was written by Duffy, James V.;Lee, Gilbert F.;Lee, John D.;Hartmann, Bruce. And the article was included in ACS Symposium Series in 1990.SDS of cas: 115-84-4 The following contents are mentioned in the article:
The steric effect that pendant groups present in the diol chain extender have on the glass (Tg) and m.p. (Tm) transitions and dynamic mech. properties of some PTMG polyurethanes was studied. A series of poly(tetramethylene ether) glycol/4,4′-diphenylmethane diisocyanate prepolymers were extended with diols that contained either Me, Et, or Bu pendant groups. Differential scanning calorimetry (DSC) was used to determine the Tg and Tm of the soft and hard phases. It was found that diol pendant groups increased the amount of phase mixing in the soft segment while preventing crystallization in both the soft and hard segments. The effect of diol pendant groups on the shear modulus and loss factor of these polyurethanes was determined by a resonance technique. The size of the pendant group had no apparent effect on either Tg, Tm, or the dynamic mech. properties of these polymers. This study involved multiple reactions and reactants, such as 2-Butyl-2-ethylpropane-1,3-diol (cas: 115-84-4SDS of cas: 115-84-4).
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. 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.SDS of cas: 115-84-4
Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts