Side-chain crystallization and phase transition of poly[styrene-co-(maleic anhydride)]-g-alkylamine comb-like polymers,Polymer International

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Side-chain crystallization and phase transition of poly[styrene-co-(maleic anhydride)]-g-alkylamine comb-like polymers
Polymer International ( IF 2.9 ) Pub Date : 2021-08-07 , DOI: 10.1002/pi.6283
Huiqin Mao ₁ , Yanpeng Wang ₁ , Haixia Wang ₂ , Lang Li ₃ , Haifeng Shi _{1,

3}

Affiliation

Taking NHCO as the chemical spacer, poly[styrene-co-(maleic anhydride)]-g-alkylamine (SMACnN) comb-like polymers are prepared through grafting reaction between poly[styrene-co-(maleic anhydride)] and n-alkylamine with n changing from 12 to 18. SMACnN comb-like polymers present an obvious crystallization behavior owing to the introduced alkyl side chains, and the melting temperature and enthalpy of the side-chain crystallites increase from 9.2 to 41.6 °C and from 6.0 to 17.6 kJ mol⁻¹, respectively, showing a variation with the side-chain length. At least 12 side-chain carbon atoms are required to pack into a hexagonal crystal structure for SMACnN comb-like polymers. Fourier transform infrared and X-ray analysis results demonstrate the phase transition from hexagonal to an amorphous state, and the conformationally disordered alkyl chains affect the packing manner of side-chain crystallites. Including the side-chain length and polymer backbone, the chemical spacer between the side chain and the main chain influences the formation of side-chain crystallites and the phase transition process. So, the study of SMACnN further strengthens the understanding of the phase transition behavior and side-chain crystallization of comb-like polymers triggered by the side-chain length and the microstructure differences. © 2021 Society of Industrial Chemistry.

中文翻译：

聚[苯乙烯-共-（马来酸酐）]-g-烷基胺梳状聚合物的侧链结晶和相变

服用 NHCO 作为化学间隔物，聚[苯乙烯-共- （马来酸酐）] -克烷基胺（SMAC Ñ N）的梳状聚合物是通过接枝聚之间的反应来制备[苯乙烯-共- （马来酸酐）]和n-烷基胺，n从12变为18。由于引入了烷基侧链，SMAC n N梳状聚合物呈现出明显的结晶行为，侧链微晶的熔化温度和焓从9.2增加到41.6° C 和 6.0 至 17.6 kJ mol ^-1，分别显示随侧链长度的变化。至少需要 12 个侧链碳原子才能组装成 SMAC n N 梳状聚合物的六方晶体结构。傅里叶变换红外和 X 射线分析结果表明从六方到无定形状态的相变，并且构象无序的烷基链影响侧链微晶的堆积方式。包括侧链长度和聚合物主链，侧链和主链之间的化学间隔物影响侧链微晶的形成和相变过程。所以，SMAC n的研究N进一步加强了对由侧链长度和微观结构差异引发的梳状聚合物的相变行为和侧链结晶的理解。© 2021 工业化学学会。

更新日期：2021-08-07

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