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时间:2020-03-22
《PP/POSS纳米复合材料热氧化稳定性.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、塑料工业第44卷第9期·106·CHINAPIAST【CSINDUSTRY2016年9月PP/POSS纳米复合材料热氧化稳定性水周灿,聂士斌',董翔,张弛,(1.安徽理工大学能源与安全学院,安徽淮南232001;2.煤矿安全高效开采省部共建教育部重点实验室,安徽淮南232001)摘要:采用熔融物理共混和熔融反应共混两种方法制备了聚丙烯(PP)/八乙烯基笼型硅倍半氧烷(OV—POSS)纳米复合材料,并用热重分析对两种方法制备的复合材料热氧化稳定性进行分析和比较。结果表明,在OV.POSS含量同为2%(质量分数)时,
2、物理共混复合材料的热氧化稳定性要优于反应共混复合材料,且物理共混复合材料的热氧化稳定性随着OV—POSS含量的增加而提高。为进一步评估OV—POSS对物理共混复合材料热氧化性能的影响,利用Kissinger法和Flynn.wall-Ozawa方法从热氧化降解动力学的角度对复合材料表观活化能(E。)进行了研究。研究表明,OV—POSS可以明显提高复合材料的E。,含5%(质量分数)OV—POSS的物理共混复合材料的E为92.48kJ/mol(Kissinger法)和97.53H/mol(Hynn-wal1·Ozawa
3、法),而纯PP的E仅为67.79kJ/mol以及61.81H/mol。关键词:聚丙烯;八乙烯基笼型硅倍半氧烷;热氧化稳定性;表观活化能doi:10.3969/j.issn.1005-5770.2016.09.026中图分类号:TQ325.14文献标识码:A文章编号:1005—5770(2016)09—0106—06Thermo.oxidativeStabilityofPP/PoSSNanocompositesZHOUCan.-.NIEShi—bin,-,DONGXiang.一,ZHANGChi,(1.School
4、ofMiningandSafety,AnhuiUniversityofScienceandTechnology,Huainan232001,China;2.KeyLaboratoryofSafetyandHigh—eficiencyCoalMining,MinistryofEducation,AnhuiUniversityofScienceandTechnology,Huainan232001,China)Abstract:Polypropylene(PP)/octavinylpolyhedraloligomer
5、icsilsesquioxane(OV—POSS)nanocompositeswerepreparedbythemethodsofmeltphysicalblendingandmeltreactiveblending.1’hethermo—oxidativestabilityofcompositespreparedbythetwomethodswasanalyzedandcomparedusingthermogravimetricanalysis.Theresultsshowthatintheconditiono
6、f2wt%OV—POSSloading.thecompositesbyphysicalblendinghaveahigherthermaloxidativestabilitythancompositesbyreactiveblending,andthethermaloxidativestabilityofcompositesbyphysicalblendingincreaseswiththeincreasingofOV-POSScontents.InordertofurtherevaluatetheOV—POSS
7、effectonthethermaloxidativedegradationofcompositesbyphysicalblending,theapparentactivationenergy(E)ofcompositeswerestudiedfromtheangleofkineticsofthermaloxidativedegradationusingtheKissingerandFlynn-Wall—Ozawamethods.StudiesshowthatOV-POSScanobviouslyincrease
8、Eofthematerials.WhentheOV—POSScontentis5wt%,Evaluesofphysicalblendingcompositesare92.48kJ/mol(byKissingermethod)and97.53kJ/mol(byFlynn—Wall—Ozawamethod),andEvaluesofpurePParejust67.79and6
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