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采用水相沉淀聚合法分批次添加原料制备投料比为85/15(摩尔百分数,下同)的丙烯腈-丙烯酸甲酯共聚物(85/15AN/MA),研究单体投料方式对共聚物组成、黏度、数均序列长度以及可熔融行为的影响;在190~210℃下采用熔融纺丝工艺制备了AN/MA初生纤维。采用红外光谱(FT-IR)、核磁共振波谱(NMR)、差热分析(DSC)、扫描电子显微镜(SEM)和纤维强力仪等对聚合产物和纤维进行了表征分析。结果表明:随着单体投料方式由一次性添加改变至匀速滴加,共聚物的组成与投料比接近,特性黏度由0.88dL/g降低至0.31dL/g,玻璃化转变温度(T_g)由87.6℃降低至83.8℃,熔融温度由140℃降低至138℃,AN单元的数均序列长度由10.53降低至8.00。聚合过程中分3次投料制备的初生纤维表面光滑,横截面致密,断裂强度为2.4cN/dtex,进行后拉伸等处理后,可满足服用要求。
Aqueous acrylonitrile-methyl acrylate copolymer (85 / 15AN / MA) with a feed ratio of 85/15 (mole percent) was prepared by adding raw materials in batches by aqueous precipitation polymerization. Composition, viscosity, length of number average sequence and melting behavior. The AN / MA primary fibers were prepared by melt spinning at 190 ~ 210 ℃. The polymerization products and fibers were characterized by FT-IR, NMR, DSC, SEM and FTIR. The results showed that the composition of the copolymer and the feed ratio were close to each other, the intrinsic viscosity decreased from 0.88dL / g to 0.31dL / g, and the glass transition temperature (T_g) decreased from 87.6 ° C to 83.8 ° C, the melt temperature decreased from 140 ° C to 138 ° C, and the number average length of AN units decreased from 10.53 to 8.00. The primary fiber prepared by feeding 3 times in the polymerization process has a smooth surface, a dense cross-section and a breaking strength of 2.4 cN / dtex. After being subjected to post-stretching treatment, the newborn fiber can meet the requirements for taking the product.