硫酸钙晶须/TMB-5 复合成核剂改性聚丙烯的结晶和熔融行为研究  

Effect of Crystallization and Melting Behaviors of Polypropylene Modified with CaSO_4 Whiskers/TMB-5 Combined Nucleating Agent

作　　者：何彬[1] 张跃飞[1] 周培章[1] 任晓琼[1] 何娟[1] 

机构地区：[1]长沙理工大学化学与生物工程学院,湖南长沙410114

出　　处：《中国塑料》2017年第4期81-84,共4页China Plastics

基　　金：国家自然科学基金项目(21376031);湖南省教育厅资助科研项目(16A004);湖南省研究生科研创新项目资助(CX2016B416)

摘　　要：采用硅烷偶联剂(KH-550)对硫酸钙晶须进行表面改性,对改性前后硫酸钙晶须的结构进行了红外光谱表征,运用差示扫描量热仪研究了β成核剂(TMB-5)、改性后的硫酸钙晶须(K-CSW)及K-CSW/TMB-5复合成核剂改性聚丙烯(PP)的结晶和熔融行为,并着重研究了K-CSW与TMB-5在PP中的协同成核改性效果。结果表明,硅烷偶联剂已成功偶联于硫酸钙晶须的表面,K-CSW可有效促进PPβ晶型的形成,且K-CSW与TMB-5在PP中具有明显的协同成核效果,对PP结晶峰温度和β晶成核能力的提升也更加显著;当PP中TMB-5添加量为0.2%(质量分数,下同)、KCSW添加量为2%时,改性后PP中β晶的相对含量高达90.1%,结晶峰温度从纯PP的122.3℃升高至127.2℃。A surface modification of calcium sulfate whiskers was performed by using a KH-550 silane coupling agent,and their structures before and after the surface modification were investigated comparatively by Fourier-transform infrared spectroscopy.The crystallization and melting behaviors of polypropylene（PP）nucleated withβ-nucleating agent（TMB-5）,surfacemodified CaSO4 whiskers（K-CSW）,and a mixture of CaSO4 whiskers and TMB-5were studied by differential scanning calorimetry,and the nucleating effects of these three nucleating agents were compared.The results indicated that the K-CSW could effectively promote the formation ofβ-crystals and it also exhibited a synergistic nucleating effect with TMB-5,thus resulting in an improvement in crystallinity of PP.When 0.2 wt % of TMB-5and 2 wt % of K-CSW were incorporated into PP,the relative content ofβ-crystals in PP reached 90.1 %,and the peak crystallization temperature of nucleated PP increased to 127.2 ℃from 122.3 ℃ of pure PP.

关 键 词：Β成核剂 硫酸钙晶须 聚丙烯 协同成核作用 

分 类 号：TQ325.14[化学工程—合成树脂塑料工业]