| 纳米碳酸钙及其表面处理对等规聚丙烯结晶行为的影响 |
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| 引用本文： | 马传国,容敏智,章明秋.纳米碳酸钙及其表面处理对等规聚丙烯结晶行为的影响[J].高分子学报,2003(3):381-386. |
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| 作者姓名： | 马传国 容敏智 章明秋 |
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| 作者单位： | 1. 教育部聚合物复合材料和功能材料重点实验室
2. 中山大学材料科学研究所,广州,510275 |
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| 基金项目： | 广东省科技计划项目“十五”规划重大专项 (项目号A10 70 2 )，广东省自然科学基金 (基金号 990 2 77)，广东省自然科学基金团队项目资助 |
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| 摘 要： | 应用差示扫描量热方法研究了不同表面改性碳酸钙纳米粒子对聚丙烯 (PP)等温与非等温结晶动力学的影响 ,并研究了上述各聚丙烯结晶样品的熔融行为和晶型 .研究发现纳米碳酸钙具有明显的成核效应 ,并具有较强的诱导 β 型结晶的能力 ,而且与粒子的表面处理密切相关 .
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| 关 键 词： | 聚丙烯 碳酸钙纳米粒子 结晶动力学 β-晶型 |
| 修稿时间： | 2002年7月8日 |
INFLUENCE OF NANO-CaCO3 AND SURFACE MODIFICATION ON THE CRYSTALLIZATION BEHAVIOR OF ISOTACTIC POLYPROPYLENE |
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| MA Chuanguo,RONG Minzhi,ZHANG Mingqiu.INFLUENCE OF NANO-CaCO3 AND SURFACE MODIFICATION ON THE CRYSTALLIZATION BEHAVIOR OF ISOTACTIC POLYPROPYLENE[J].Acta Polymerica Sinica,2003(3):381-386. |
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| Authors: | MA Chuanguo RONG Minzhi ZHANG Mingqiu |
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| Institution: | MA Chuanguo1,RONG Minzhi2,ZHANG Mingqiu2 |
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| Abstract: | Mechanicalpropertiesofpolymerscanbeimprovedbyincorporatingnanoparticles,however,therearefew worksabouttheinfluenceofnanoparticlesonthecrystallizationmechanismofpolymers .Todevelopanunderstanding oftheimportantroleofnanoparticlesinpolymercrystallization ,thecurrentpaperintroduceddifferentsurface modificationsforcalciumcarbonatenanoparticles,andstudiedtheireffectsonthecrystallizationbehaviorofisotactic polypropylene (iPP)byDSCmeasurement.TheCaCO 3particlesusedare 40nmindiameter,andtheirsurfaceswere treatedbystearic coating ,PS grafting ,andPBA graftingmethods ,respectively .Theisothermalcrystallizationresults showthattheadditionofbothneatandmodifiednano CaCO3intoPPhasanobviousnucleatingeffectonthe crystallizationofiPP ,resultinginlowersupercoolingdegree,higherrateofnucleationandoverallrateof crystallization,andhighercrystallinity .EventhroughgraftedPBAandPSbelongtoamorphouspolymers,their evidentnucleatingeffectsindicatesomeregularstructureformingontheparticlessurface .However,thegraftedPBA exhibitsdifferenteffectfromPSbecauseofitsdistinctmolecularpolarityandstiffness .Ontheotherhand ,thenon isothermalcrystallizationresultsshowthattheadditionofthesenano CaCO 3reducedtherateofnucleationand overallrateofcrystallizationofiPP ,whichisrelatedwiththeslowerformationprocedureofβ formcrystallitesof iPP .ThemeltingbehaviorandWAXDresultsrevealedthatallofthesenano CaCO3haveastrongpromotingeffect onthenucleationandcrystallizationofβ formcrystallitesofiPP ,especiallyforthesystemscontainingmodified fillers ,implyingthatthispromotingeffectwasstronglydependentonthesurfacemodificationsofthenano CaCO3 particles . |
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| Keywords: | Polypropylene Calcium carbonate nanoparticle Crystallization kinetics β- Form crystallite |
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