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ID:34960928
大小:1.96 MB
页数:6页
时间:2019-03-15
《纳米纤维素晶须增强生物聚酯p(3,4)hb复合材料》由会员上传分享,免费在线阅读,更多相关内容在工程资料-天天文库。
1、林业工程学报,2016,1(3):85-90JournalofForestryEngineeringDoi:10.13360/j.issn.2096-1359.2016.03.016纳米纤维素晶须增强生物聚酯P(3,4)HB复合材料∗张仁华,张蕤,黎航,凌敏,刘志鹏(南京林业大学化学工程学院,南京210037)摘要:由于纳米纤维素晶须(CNW)表面含有丰富的羟基,亲水性强,制约了其在疏水性聚合物体系中的应用。本研究以硅烷偶联剂KH-550对纳米纤维素晶须进行改性,降低其表面的亲水性,再以改性后的纳米纤维素晶须(STCNW)为增强相、可生物降解聚(3-羟基丁酸酯-co-4-羟基丁酸酯
2、)[P(3,4)HB]为基体,采用溶液浇铸法制备P(3,4)HB/STCNW纳米复合材料。通过傅里叶变换红外光谱、X-射线衍射仪、接触角测试、扫描电镜、偏光显微镜、拉伸测试和热重分析仪等对其微观结构、表面形貌、结晶行为、力学性能和热稳定性等进行表征与分析。结果表明:改性后的纳米纤维素晶须具有良好的疏水性,可均匀分散在P(3,4)HB基体中形成纳米复合结构,能促进P(3,4)HB结晶的形成,提高基体的拉伸强度和弹性模量等力学性能,但热稳定性稍差。关键词:纳米纤维素晶须;硅烷化;聚(3-羟基丁酸酯-co-4-羟基丁酸酯);力学性能中图分类号:TQ35文献标志码:A文章编号:2096-1
3、359(2016)03-0085-06BiopolyesterP(3,4)HB⁃basednanocompositesreinforcedbycellulosenanowhiskers∗ZHANGRenhua,ZHANGRui,LIHang,LINGMin,LIUZhipeng(CollegeofChemicalEngineering,NanjingForestryUniversity,Nanjing210037,China)Abstract:Poly(3⁃hydroxybutyrate⁃co⁃4⁃hydroxybutyrate)(P(3,4)HB)isamemberofPolyh
4、ydroxyalkanoates(PHAs),whichhavelotsofoutstandingproperties,suchasbiodegrability,biocompatibilityandexcellentmechanicalproperties.Nevertheless,thebrittleness,lowelongationatbreak,andlowthermalstabilityofP(3,4)HBduetoitshighlyorderedstructurehavegreatlylimitedtheapplicationofP(3,4)HBinsomeareas
5、.Theadditionofnanofillertoacompositematerialisawell⁃knownapproachinmanyapplicationstoachievereinforcingeffectandthustoimprovethetoughnessalongwithstrengthandstiffnessofthecomposite.Inthisstudy,cellulosenanowishker(CNW)wasmodifiedbythesilanecouplingagentKH-550toimprovetheirdispersibilityandcomp
6、atibilityinhydrophobicpolymers.Then,si⁃lanetreatedcellulosenanowhiskers(STCNW)wasusedasareinforcingagentandwasincorporatedintobiopolyesterpoly(3⁃hydroxybutyrate⁃co⁃4⁃hydroxybutyrate)bysolutioncastingtoprepareP(3,4)HB/STCNWnanocomposites.Themicro⁃structure,surfacemorphology,crystallizationbehav
7、ior,mechanicalpropertyandthermalpropertyofP(3,4)HBanditsnanocompositeswereinvestigatedbyFourierTransformInfraredSpectroscopy(FTIR),X-raydiffraction(XRD),contactangletest,scanningelectronmicroscope(SEM),polarizedopticalmicroscope(POM),te
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