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首页> 外文期刊>Journal of Applied Polymer Science >Carbon-13 Nuclear Magnetic Resonance Investigation of Styrene-#alpha#-Methylstyrene Copolymers
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Carbon-13 Nuclear Magnetic Resonance Investigation of Styrene-#alpha#-Methylstyrene Copolymers

机译：苯乙烯-α-甲基苯乙烯共聚物的碳13核磁共振研究

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摘要

A copolymer based on #alpha#-methylstyrene (AMS) was investigated by nuclear magnetic resonance (NMR).The styrene-co-#alpha#-methylstyrene (SAMS) was analyzed by solution and solid-state NMR techniques.Three copolymers of SAMS with different compositions presented a particular behavior.The solution results showed the copolymer microstructure and the AMS content.The carbon-13 spectra of SAMS C indicated that the AMS CH_3 signal was detected at three distinct chemical shifts,because of the different comonomer-sequences distribution.The proton spin-lattice relaxation time in the rotating frame (T_1~H P) parameter was chosen because it permits the evaluation of changes in the molecular mobility.The values of T_1~Hpfound for the copolymers confirmed the random distribution in the samples.The copolymer with a low quantity of AMS (1.7%),when analyzed by this relaxation parameter,showed lower values that were interpreted as an antiplasticization effect.The SAMS copolymer with a higher AMS quantity showed a plasticization effect.
机译：通过核磁共振（NMR）研究了基于＃α＃-甲基苯乙烯（AMS）的共聚物，并通过溶液和固态NMR技术分析了苯乙烯-co-＃α＃-甲基苯乙烯（SAMS）.SAMS的三种共聚物溶液的结果显示了共聚物的微观结构和AMS含量。SAMS C的碳13光谱表明，由于共聚单体序列的不同，在三个不同的化学位移上检测到了AMS CH_3信号。选择质子自旋晶格弛豫时间在旋转框架（T_1〜HP）参数中是因为它可以评估分子迁移率的变化。共聚物的T_1〜Hpfound值证实了样品中的随机分布。当用该弛豫参数分析时，具有少量AMS（1.7％）的共聚物显示出较低的值，这被认为是抗塑化作用。具有较高AMS含量的SAMS共聚物韧性显示出增塑作用。

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