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以丙烯酸丁酯(BA)、甲基丙烯酸甲酯(MMA)、苯乙烯(St)为主要单体,1,4-丁二醇二丙烯酸酯(BDDA)与二乙烯苯(DVB)为核层复合交联剂,DVB为外壳交联剂,采用种子乳液聚合法制备了核壳型聚丙烯酸酯(ACR)粒子。采用FT-IR、TEM、DSC考察了ACR粒子的组成、结构与性能,TEM观察到完整的核壳结构以及核壳间过渡层,DSC分析表明,ACR粒子表现出与内核、过渡层与外壳对应的3个玻璃化转变温度(Tg),分别为-22.73℃、26.37℃、102.16℃。探讨了核层组成、核壳比、交联剂等对核壳型ACR粒子抗冲击性能的影响。缺口冲击强度实验结果表明,当核壳比为65/35、内核/过渡层比为75/25,外壳交联剂DVB、核层复合交联剂(BDDA+DVB)用量分别为外壳单体、核层单体质量的1.2%~1.6%、1.2%时,ACR对PVC具有最佳的抗冲击性能。
The main monomers of BA, MMA and ST, BDDA and DVB were used as the core layer Composite cross-linking agent and DVB as shell cross-linker, core-shell polyacrylate (ACR) particles were prepared by seed emulsion polymerization. The composition, structure and properties of ACR particles were investigated by FT-IR, TEM and DSC. The complete core-shell structure and inter-core-shell transition layer were observed by TEM. DSC analysis showed that the ACR particles corresponded to the core, transition layer and shell Of the three glass transition temperature (Tg), respectively -22.73 ℃, 26.37 ℃, 102.16 ℃. The effects of core layer composition, core-shell ratio and cross-linking agent on the impact resistance of core-shell ACR particles were discussed. The experimental results of notched impact strength show that when the core / shell ratio is 65/35 and the ratio of core / transition layer is 75/25, the amount of shell crosslinker DVB and core layer composite crosslinker (BDDA + DVB) ACR has the best impact resistance to PVC at 1.2% -1.6% and 1.2% of the monomer weight of the core layer.