CAJ | 학술논문

要:?以过氧化二异丙苯(DCP)为引发剂、1,4-丁二醇二丙烯酸酯(BDDA)为接枝单体,通过反应挤出制备长支链聚丙烯(PP),研究了PP链长及主链中乙烯嵌段含量对PP长链支化程度的影响.随着PP树脂分子链长度降低以及乙烯嵌段含量增加,PP大分子自由基发生接枝和双基偶合扩链反应的几率增大,导致BDDA在PP主链上的接枝率提高,反应挤出产物的熔体弹性效应增强以及在Cole-Cole曲线出现上翘所对应的动态黏度降低.黏度降低表明分子链松弛时间增加,PP长链支化程度增大..
요:?이과양화이이병분(DCP)위인발제、1,4-정이순이병희산지(BDDA)위접지단체,통과반응제출제비장지련취병희(PP),연구료PP련장급주련중을희감단함량대PP장련지화정도적영향.수착PP수지분자련장도강저이급을희감단함량증가,PP대분자자유기발생접지화쌍기우합확련반응적궤솔증대,도치BDDA재PP주련상적접지솔제고,반응제출산물적용체탄성효응증강이급재Cole-Cole곡선출현상교소대응적동태점도강저.점도강저표명분자련송이시간증가,PP장련지화정도증대..
@@@@Polypropylene?(PP)?with?long-chain?branching?was?prepared?with?dicumyl?peroxide?(DCP)?as?initiator?and?1,4-butanediol?diacrylate?(BDDA)?as?graft?monomer?via?reactive?extrusion.?The?influences?of?the?length?of?the?PP?chain?and?the?content?of?ethylene?units?in?the?PP?chains?on?the?degree?of?long-chain?branching?of?the?PP?were?investigated.?With?the?decrease?in?the?PP?chain?length?and/or?the?increase?in?the?content?of?ethylene?units?in?the?PP?chains,?the?probability?of?occurring?of?graft?reaction?of?BDDA?on?the?PP?chains?and?chain?extension?by?coupling?reaction?between?PP?macromolecular?radicals?increased,?as?a?result,?the?grafting?ratios?of?BDDA?onto?the?PP?chains?rose?and?elastic?effect?of?melt?in?the?reactive?extruded?products?strengthened.?The?dynamic?viscosity?corresponding?to?the?upturning?of?the?Cole-Cole?plot?reduced,?indicating?that?the?relaxation?time?of?the?segments?in?the?reactive?extruded?products?became?longer?and?the?degree?of?long-chain?branching?was?raised.