Abstract
AbstractGlass transition temperatures as a function of structure for phosphorus‐containing polyamides and polyamides containing other heteroatoms are analyzed in terms of the effect of polarity, steric behavior, and bond flexibility differences. The side‐chain alkyl or aryl group carried by phosphorus was expected to increase chain mobility (lower glass transition temperatures) by separating chains and reducing intermolecular interaction. This general effect is offset by decreased mobility due to the greater polarity of the phosphorus groups, and the intramolecular steric hindrance to rotation caused by the alkyl or aryl group on phosphorus. Glass transition temperatures indicate the following order of bond flexibility: (CH2NCH2 ≈ CH2SCH2≈ CH2OCH2)> CH2P(R)CH2 ≈ CH2CH2CH2. The phosphorus‐to‐carbon bond showed no enhanced flexibility over a carbon‐to‐carbon bond.
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