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- W2090113592 abstract "Homogeneous condensation of a symmetrical diacyl monomer T with two symmetrical diols D1 and D2 has been studied under low-temperature, nonequilibrium conditions, using the diol sequence in the product as a probe. For terephthalate copolyesters of diols such as bisphenol A and neopentyl glycol the alternation frequency f12 has been related to the rate parameters by measurement [using nuclear magnetic resonance (NMR) and other methods] and calculation. It is usually assumed that all functionalities attached to the same residue have the same reactivity, that is, that all steps of type have the same specific rate; this assumption leads to a random, high-molecular-weight copolyester. If the diacyl species shows a large penultimate group effect, as in phosgene, chloroformate [see M. Matzner et al., Chem. Rev., 64, 645 (1964)], and phthalates, this assumption must be discarded. After simplification the alternation can be calculated exactly in terms of two parameters: r, the relative reactivity of the diacyl functionalities, and δ, the relative reactivity of the two diols. A nonrandom copolyester results only when neither r nor δ is unity. The maximum nonrandomness (for fixed r) occurs when δ → ∞ (sequential reaction)." @default.
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- W2090113592 date "1978-11-01" @default.
- W2090113592 modified "2023-10-14" @default.
- W2090113592 title "Diol sequencing in copolyesters" @default.
- W2090113592 doi "https://doi.org/10.1002/pol.1978.170161111" @default.
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