典型文献
Interfacial Chain Entanglements Induced Melt Memory Effect in Poly(ε-caprolactone)/Silica Nanocomposites
文献摘要：
It is known that the enhanced melt memory effect is strongly correlated with the retarded chain dynamics.However,previous studies using differential scanning calorimetry(DSC)showed a weakened or even vanished melt memory in polymer nanocomposites,although adding nanoparticles in polymers often reduces chain mobility.In this work,we added two kinds of silica nanoparticles,O15 and W22 nanoparticles(with low and high surface silanol density,respectively),to poly(ε-caprolactone)(PCL),where the degree of chain entanglements near nanoparticles increases,and chain dynamics is gradually retarded with increasing silica content.The strongly aggregated W22 nanoparticles show significant heterogeneous nucleation,while well-dispersed O15 nanoparticles exhibit very weak heterogeneous nucleation.In contrast to the restrained self-nucleation effects during the rapid non-isothermal crystallization of two nanocomposites,we found evident melt memory effects during the slow isothermal crystallization in PCL/O15 nanocomposites as indicated by DSC and polarized light microscopy(PLM)measurements.The melt memory becomes stronger with more O15 nanoparticles,but depends non-monotonically on the loadings of W22 nanoparticles.The lifetime of the melt memory effects matches the chain re-entanglement time of the SN melts of nanocomposites,which is consistent with our previous work on PCL miscible blends.The complicated influence of silica on nucleation and crystal growth is induced by the spatial inhomogeneity of chain entanglements in the silica-filled PCL system.The decrease in the entanglement density of the interfacial chains in the SN melts of nanocomposites is conducive to nucleate under slow isothermal crystallization,but the chain mobility is still greatly restrained by the nanoparticles,causing the slow growth rate of spherulites and the difficulty to form nuclei under fast non-isothermal crystallization.
文献关键词：
中图分类号：
作者姓名：
Xiang Liu;Wen-Zhi Cui;Wei Yu
作者机构：
Advanced Rheology Institute,Department of Polymer Science and Engineering,Shanghai Key Laboratory of Electrical Insulation and Thermal Ageing,State Key Laboratory for Metal Matrix Composite Materials,Shanghai Jiao Tong University,Shanghai 200240,China
文献出处：
引用格式：
[1]Xiang Liu;Wen-Zhi Cui;Wei Yu-.Interfacial Chain Entanglements Induced Melt Memory Effect in Poly(ε-caprolactone)/Silica Nanocomposites)[J].高分子科学（英文版）,2022(11):1451-1465
A类：
Entanglements,miscible,spherulites
B类：
Interfacial,Chain,Induced,Melt,Memory,Effect,Poly,caprolactone,Silica,Nanocomposites,It,known,that,enhanced,memory,strongly,correlated,retarded,dynamics,However,previous,studies,differential,scanning,calorimetry,DSC,showed,weakened,even,vanished,nanocomposites,although,adding,nanoparticles,polymers,often,reduces,mobility,this,work,added,two,kinds,silica,O15,W22,high,surface,silanol,density,respectively,PCL,where,degree,entanglements,near,increases,gradually,increasing,content,aggregated,significant,heterogeneous,nucleation,while,well,dispersed,exhibit,very,contrast,restrained,self,effects,during,rapid,isothermal,crystallization,found,evident,slow,indicated,by,polarized,light,microscopy,PLM,measurements,becomes,stronger,more,but,depends,monotonically,loadings,lifetime,matches,SN,melts,which,consistent,our,blends,complicated,influence,growth,induced,spatial,inhomogeneity,filled,system,decrease,interfacial,chains,conducive,nucleate,under,still,greatly,causing,rate,difficulty,form,nuclei,fast
AB值：
0.487609
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