采用种子乳液聚合方法制备了一系列交联度不同的核壳结构聚丙烯酸丁酯/甲基丙烯酸甲酯-甲基丙烯酸共聚物Poly（BA/MMA-co-MAA）,简称PBMMA,单体总转化率达99.4%,乳胶粒径为302 nm,且理论值与实测值基本一致,说明该体系没有明显的二次成核过程。当交联剂质量分数为0.5%时,尼龙6/PBMMA（100/20）共混物的缺口冲击强度最大。DMA谱图表明,改性体系低温及尼龙6的α玻璃化转变区域变宽及损耗峰幅度减弱,使得尼龙6与PBMMA间有良好的相容性。SEM观察证实了这种改性效果。
A series of poly（BA/MMA-co-MAA） core/shell polymer（PBMMA） with different crosslinking densities were prepared by seeded emulsion polymerization.Gravimetric analysis was used to measure the conversion of monomer to polymer throughout the reactions and revealed that the polymerizations have proceeded under monomer-starved conditions（the final conversion99.4%）.The good agreement shown between experimental and theoretical particle diameters throughout the polymerization for all latexes provided strong evidence that the latex particles are grown without significant secondary nucleation.When using 0.5% crosslinking agent（Allyl methacrylate,ALMA） by mass fraction,the notched Izod impact strength of PA6/PBMMA（100/20） reaches a maximal value.DMA spectra showed that the broaden breadth of the transition zone at low temperature glass transition region and the weaken magnitude of loss peak of nylon 6（Tα） improve the compatibility between nylon 6 matrix and PBMMA particles.The SEM observation verified the results of modifying nylon 6.
参考文献
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