阴离子聚合制备聚乙烯-g-聚氧化乙烯接枝共聚物

聚烯烃 (聚乙烯 ,聚丙烯等 )的化学改性一直是科学研究和实际生产的一个热点 ,改性过的聚烯烃可以广泛应用到高分子共混物和复合材料中 .在众多聚烯烃中 ,聚乙烯产量最大 ,但因其惰性也最难于化学改性 .我们采取的改性方法是在聚合物中引入反应性基团 ,可以在温和条件下进行有选择的而且高效的化学改性 .由于两亲性共聚物可用作乳液聚合和悬浮聚合中的表面活性剂及稳定剂 ,塑料的表面改良剂和聚合物的共混相容剂等[1,2 ] ,因此人们对该共聚物的研究越来越多 .过去 ,多数两亲性共聚物的研究局限于聚苯乙烯 (ＰＳ)和聚氧化乙烯 (ＰＥＯ)接枝共…

SYNTHESIS OF GRAFT COPOLYMER PE-g-PEO BY A NEW ANIONIC GRAFT-FROM POLYMERIZATION

A new route for synthesis of amphiphilic graft copolymer PE-gPEO containing hydrophobic polyethylene as the backbone and hydrophilic poly(ethylene oxide) a s the side chain has been discussed in this paper.The structure of the copolyme r(such as graft density and graft length),the molecular weights of both polyeth ylene and poly(ethylene oxide) side chain,as well as the molecular weight distr ibution of the copolymer can be designed and controlled easily by this route.Th e molecular weight of poly(ethylene oxide) side chain is proportional to the pol ymerization reaction time and the ethylene oxide monomer concentration,which in dicates the “living" characterization of the anonic polymerization of ethylene oxide.The graft copolymers PE-g-PEO synthesized have been characterized b y 1H-NMR and DSC tests.And the SEM result shows that after adding the amp hiphili c graft copolymer PE-g-PEO as the compatibilizer for the PE/PC polymeric b lend,the compatibility of the blend improved greatly.Therefore,this kind of a mphiphilic graft copolymers can be used as the efficient surfactant for the poly olefin blend and composite materials.