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时间:2020-03-26
《水滑石与β成核剂复配改性等规PP的等温结晶动力学.pdf》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、第42卷,第1期工程塑料应用v0l·42·N。·1J932014年1月ENGINEERINGPLASTICSAPPLICATIONan.2O14doi:lO.3969/j.issn.1001—3539.2014.O1.020水滑石与p成核剂复配改性等规PP的等温结晶动力学古杨红艳,刘江,周晓红,刁梦娜。,邱学剑,杨成志,秦军[1.贵州大学材料与冶金学院,贵阳550003;2.喀斯特环境与地质灾害防治教育部重点实验室(贵州大学),贵阳550003;3.贵州红林机械有限公司,贵阳5500091摘要:为了研究水滑石(LDH)与p成核剂组成的复配成核剂对等规聚丙烯(PP)的成核效果,采用
2、差示扫描量热(DSC)仪研究了8成核荆和LDH/p改性等规PP的等温结晶动力学。实验结果表明,在等温结晶温度(120,122,124,126,128~(2)下,复配成核剂使等规PP达到最大结晶速率时的时间和半结晶期缩短了83%95%,大幅度提高了等规PP的动力学结晶速率常数(例如当等温结晶温度为120qC时,使等规PP的动力学结晶速率常数从0.35min提高到57.74min)。在等温结晶过程中得到的Avrami指数,z在2.28~3.41之间,在等温结晶条件下,纯等规PP及改性等规PP的晶体可能是二维盘状生长和球晶三维生长。复配成核剂在等规PP中起到了良好的异相成核作用,显著地
3、提高了等规PP的结晶速率。关键词:水滑石;B成核剂;复配成核剂;等规聚丙烯;等温结晶动力学;结晶速率常数中图分类号:TQ325.1+4文献标识码:A文章编号:1001—3539(2014)01.0093—05IsothermalCrystaIlizati0nKineticsofLayeredDoubleHydroxides/pNucleatingAgentModifiedIsotaticPOlyprOpyleneYangHongyan,LiuJiang,ZhouXiaohong,DiaoMengna,QiuXuejian,YangChengzhi,QinJun[1.Schoolo
4、fMaterialsandmetallurgy,GuizhouUniversity,Guiyang550003,China;2.KeyLaboratoryofKarstEnvironmentandGeohazardPrevention(GuizhouUniversity),MinistryofEducation,Guiyang550003,China;3.GuizhouHonglinMachineryCo.Ltd.,Guiyang550009,China]Abstract:Inordertostudythenucleatedefectofcompoundnucleatingage
5、ntcomposedoflayereddoublehydroxides(LDH)andpnucleatingagentonisotaticpolypropylene.Theisothermalcrystallizationkineticsofmodifiedisotaticpolypropylenewasstudiedbydifferentialscanningcalorimeter.Theresultsshowthatwhenaddingthecompoundnucleatingagent,thetimeofreachingthemaximumcrystallizationra
6、teandthehalfcrystallizationtimeofisotaticpolypropylenearesho~enedby83%~95%,andthecrystallizationkineticrateofisotaticpolypropyleneisincreased,forexample,thecrystallizationkineticrateofisotaticpolypropyleneisincreasedfrom0.35min~to57.74minat120℃.Avramiexponentwhichvalueis2.28—3.41isdeterminedf
7、orisotaticpolypropylene,whichimpliesthattheisothermalcrystallizationistwoorthree—dimensionalgrowth.ThecompoundnucleatingagentcouldplayaroleOfheterOgene0usnucleatingagentinisotaticpolypropyleneandincreasethecrystallizationrateofisotaticpolypro
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