长支链型PDMS-g-PE共聚物的制备及其增塑润滑作用  

Synthesis, characterization and lubricating effect of long chain branched polydimethylsiloxane-g-polyethylene copolymers

作　　者：金震[1] 范宏[1] 

机构地区：[1]浙江大学化学工程与生物工程学院,化学工程联合国家重点实验室,浙江杭州310027

出　　处：《化工学报》2016年第2期672-678,共7页CIESC Journal

基　　金：化学工程联合国家重点实验室基金项目(SKL-Ch E-12T08);国家重点基础研究发展计划项目(2011CB606001)

摘　　要：通过低含氢硅油与末端双键聚乙烯大单体的硅氢加成反应,制备了长支链型聚硅氧烷-聚乙烯接枝共聚物(PDMS-g-PE)。采用傅里叶变换红外光谱(FT-IR)、核磁共振波谱(1H NMR)、高温凝胶渗透色谱(HT-GPC)和差示扫描量热分析(DSC)表征了共聚物的结构与性能。考察了硅油含氢量对共聚物结构和热性能的影响,并将其用作HDPE的流动改性剂,研究了其增塑润滑改性效果。结果表明,硅油含氢量越高,能加成上的PE支链越多,PDMS-g-PE的分子量越大。PDMS-g-PE的聚硅氧烷主链具有极低的玻璃化温度(Tg),显示出优异的分子链柔顺性。聚乙烯支链使PDMS-g-PE表现出了较高的熔点和熔融焓。在HDPE中加入2%的PDMS-g-PE,使得熔融指数(MFR)提高21%,断裂伸长率明显提高,冲击强度有所提高,而拉伸强度和弹性模量仅略有降低。Long chain branched polydimethylsiloxane-g-polyethylene（PDMS-g-PE） copolymers were synthesized by hydrosilylation reaction between polymethylhydrosiloxane and vinyl terminated PE macromonomer. The structure and properties were characterized by Fourier transform infrared spectroscopy（FT-IR）, nuclear magnetic resonance spectroscopy（1H NMR）, high temperature gel permeation chromatography（HT-GPC） and differential scanning calorimetry（DSC）. The effect of the hydrogen content of polymethylhydrosiloxane on the copolymer structure and properties was investigated. It was found that the molecular weight of PDMS-g-PE increased with the hydrogen content of polymethylhydrosiloxane since more PE macromonomers were grafted onto the polydimethylsiloxane main chains. The glass transition temperature（Tg） of PDMS-g-PE was extremely low, indicating the excellent molecular chain flexibility. PDMS-g-PE with more PE branched chains showed higher melting temperature（Tm） and higher melting enthalpy（ΔHm）. PDMS-g-PE was used as flow modifier for HDPE. When 2% PDMS-g-PE was added to HDPE, the melting flow rate（MFR） increased by 21%, the elongation at break improved significantly and the impact strength improved a little, while the tensile strength and elastic modulus decreased slightly.

关 键 词：聚二甲基硅氧烷 聚乙烯 聚合物 制备 流动改性剂 

分 类 号：TQ325.1[化学工程—合成树脂塑料工业]