低缠结超高分子量聚乙烯的制备及其对线性低密度聚乙烯的增强作用  

Synthesis of Disentangled Ultra-high Molecular Weight Polyethylene and Its Application to Enhancing the Properties of Linear Low-density Polyethylene

作　　者：贺登峰[1] 徐杰[1] 关超[1] 陈忠仁[1] 

机构地区：[1]宁波大学材料科学与化学工程学院宁波市特种高分子材料重点实验室,宁波315211

出　　处：《材料导报》2016年第4期47-51,60,共6页Materials Reports

基　　金：国家自然科学基金(21274070);浙江省重点科技创新团队(2011R50001);宁波市"3315计划"高端创业创新团队(A类)(2012S0001)

摘　　要：利用单活性位点前过渡金属FI催化剂（Fenokishi-Imin catalyst）进行乙烯的聚合反应,在较低的温度下,制备出具有低链缠结度的超高分子量聚乙烯。经高温凝胶色谱（PL-GPC）测定,产物分子量达到了（2～5）×10^6;差示扫描量热仪（DSC）检测表明其结晶度达到了70%;流变学研究表明,相对于商业超高分子量聚乙烯,产物链缠结密度大大降低。进一步的力学性能测试显示添加少量的低缠结超高分子量聚乙烯对线性低密度聚乙烯的增强作用非常明显,可使拉伸强度和断裂伸长率大大提高。The present research applied a type of single-active-site transition metal catalyst named FenokishiImin catalyst（FI catalyst）to the polymerization of ethylene at a relatively lower temperature.With the controlled chain growth rate,we successfully synthesized ultra-high molecular weight polyethylene（UHMWPE）with low entanglement density and much improved processing characteristics.Detected by gel permeation chromatography（GPC）,it has a molecular weight range of 2-5million.Differential scanning calorimeter（DSC）test showed that the crystallinity reaches above 70%.Rheological characterization indicated that the synthesized ultra-high molecular weight polyethylene has a much lower entanglement density than commercial UHMWPE.To explore its potential application,a very small amount of this disentangled UHMWPE was blended with linear low-density polyethylene（LLDPE）,obtaining significant improvement of tensile strength and elongation at break confirmed by mechanical tests.

关 键 词：超高分子量聚乙烯 共混 线性低密度聚乙烯 Fenokishi-Imin催化剂 

分 类 号：TQ314.24[化学工程—高聚物工业]