分别采用水相沉淀聚合法和乳液聚合法制备了丙烯腈-丙烯酸甲酯共聚物（AN/MA,投料比为85/15（物质的量比））,采用傅里叶变换红外光谱（FT-IR）、元素分析（EA）、乌氏黏度计、高级扩展流变仪（TA）、差示扫描量热仪（DSC）、热重分析仪（TG）对共聚物的组成、流变行为和热性能进行了研究。结果表明,水相沉淀聚合法和乳液聚合法制备的AN/MA共聚物物质的量比分别为84.85/15.15,85.30/14.70,均与投料比接近。两种聚合方式制备的共聚物的特性黏度分别为0.53 dL/g与0.51 dL/g,且熔体在30 min内均能保持良好的热力学稳定性,满足熔融加工的条件。与水相沉淀聚合法制备的共聚物相比,乳液聚合法制备的共聚物具有更优良的热力学稳定性和流变性能,可熔融加工性更佳。
Acrylonitrile-methyl acrylate（AN/MA,molar ratio 85/15） copolymers were synthesized by aqueous redox polymerization and emulsion polymerization,respectively. The copolymer composition,rheological behaviors and thermal properties of the copolymers were respectively investigated by Fourier transform infrared spectroscopy（FT-IR）,elemental analysis（EA）,Ubbelohde viscometer,rheology advantage instrument（TA）,differential scanning calorimetry（DSC） and thermogrametric（TG） analysis.The results show that the copolymer composition of the AN/MA（85/15） copolymer prepared from aqueous redox polymerization and emulsion polymerization is 84.85/15.15 and 85.30/14.70,which is very close to feed ratio.The copolymer＇s intrinsic viscosities are 0.53 dL/g and 0.51 dL/g and it exhibits good thermodynamic stability in 30 min,which is consistent with the requirements of melt spinning.In comparison with the copolymer synthesized by aqueous redox polymerization,the copolymer prepared from emulsion polymerization exhibits excellent thermodynamic stability and rheological properties and thus facilitates the copolymer with a better melt processability.
参考文献
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