CAJ | 학술논문

通过戊烷发泡剂存在下的偏氯乙烯-丙烯腈-甲基丙烯酸甲酯（VDC-AN-MMA）悬浮共聚制备包覆型热可膨胀聚合物微球，考察氯化钠、柠檬酸和重铬酸钾等水相添加剂对聚合物微球颗粒结构和热膨胀特性的影响。结果表明氯化钠、柠檬酸和重铬酸钾的添加均可起到降低聚合过程中形成难膨胀聚合物细微粒子的作用，当氯化钠添加量为4%（质量分数，基于单体，下同）、柠檬酸添加量为2.5%～5.0%、重铬酸钾添加量为0.05%～0.1%时，制备的可膨胀聚合物微球具有粒径分布窄、形态规整、聚合物对发泡剂包覆效果好等特点；加热后未膨胀聚合物微粒数目少，膨胀均匀，膨胀温度区间宽。
통과무완발포제존재하적편록을희-병희정-갑기병희산갑지（VDC-AN-MMA）현부공취제비포복형열가팽창취합물미구，고찰록화납、저몽산화중락산갑등수상첨가제대취합물미구과립결구화열팽창특성적영향。결과표명록화납、저몽산화중락산갑적첨가균가기도강저취합과정중형성난팽창취합물세미입자적작용，당록화납첨가량위4%（질량분수，기우단체，하동）、저몽산첨가량위2.5%～5.0%、중락산갑첨가량위0.05%～0.1%시，제비적가팽창취합물미구구유립경분포착、형태규정、취합물대발포제포복효과호등특점；가열후미팽창취합물미립수목소，팽창균균，팽창온도구간관。
Thermal-expandable polymer microspheres with core-shell structure were synthesized by suspension copolymerization of vinylidene chloride-acrylonitrile-methyl methacrylate (VDC-AN-MMA) in the presence of pentane as a foaming agent. The influence of water phase additives, such as sodium chloride, citric acid and potassium dichromate, on the particle structure and thermal expansion properties of polymer microspheres were investigated. The results showed that the additions of sodium chloride, citric acid and potassium dichromate could significantly reduce the number of un-expandable fine polymer particles. To be specific, when the loading of sodium chloride, citric acid and potassium dichromate was 4%, 2.5%—5.0% and 0.05%—0.1% (based on monomers), respectively, the prepared expandable microspheres exhibited narrow particle size distributions, regular morphology and good encapsulation of foaming agent by polymer. Few particles were unexpanded and the expansion of particles was uniform after the heat treating of the microspheres.