【作者】 许军；

【导师】 盛京；

【作者基本信息】 天津大学 ， 材料学， 2004， 硕士

【摘要】 聚丙烯基体中加入少量 PA6、PET、环氧树脂及反应增容剂，通过反应共混提高了材料的力学性能。 用扫描电镜和图象处理软件分析 PP/PA6、PP/PET 共混物的形貌，在扭矩流变仪中研究环氧树脂在 PP 熔体中的固化行为，测量了 PP/EPOXY共混物与水的动态接触角和 PP/EPOXY 共混物的熔体流动性，用偏光显微镜观察合金等温结晶形态并测量力学性能，最后对三体系力学性能进行对比。 PP/PA6 是典型的不相容体系，加入两种反应增容剂后相容性改善且EPDM-g-GMA 增容效果较好；PP 球晶尺寸随 PA6 含量增加而减小，PA6相分布在 PP 球晶之间，加入 PP-g-MAH 或 EPDM-g-GMA 后相容性改善；PP/PA6 中加入 EPDM-g-GMA 后起到反应增容和橡胶增韧的协同效应；PP/PA6 中加入 PP-g-MAH 后杨氏模量提高，同时屈服强度高于未增容体系。 PP/PET 也是典型的不相容体系，加入两种反应增容剂后相容性提高且 EPDM-g-GMA 的效果较好； PP 球晶随 PET 的混入而明显减小，PET相 分 散 在 球 晶 之 间 ， 加 入 EPDM-g-GMA 后 二 者 相 容 性 改 善 ，PP/PET/EPDM-g-GMA 中加入成核剂后对 PET 结晶有细化作用；PP/PET体系中加入 EPDM-g-GMA 起到反应增容和橡胶增韧的协同效应，进一步加入的成核剂有利于增韧；PP/PET 体系中加入 PP-g-MAH 后模量提高；PP/PET 中加入 PP-g-MAH 后屈服强度缓慢下降。 当共混时间达到 10~15 分钟时，环氧树脂可能凝胶化使扭矩曲线升高，之后进入固化阶段； PP 中加入环氧树脂后，交联阻碍结晶，使 PP 球晶尺寸变小、变模糊；PP 中加入环氧树脂后亲水性提高，熔体流动性下降；随 E-51 含量的增加，未增容体系的模量提高，屈服强度下降，韧性下降，加入 PP-g-MAH 后，模量进一步提高，屈服强度缓慢上升，韧性改善。 力 学 性 能 对 比 表 明 ： PP/PA6/EPDM-g-GMA 体 系 的 韧 性 最 好 ，PP/PET/PP-g- MAH 体系刚性最大，PP/E-51/203#/PP-g-MAH 体系的屈服强度最高。更多还原

【Abstract】 The mechanical properties of polypropylene were improved byreactive blending with a few nylon6, polyethylene terephthalate, epoxyand compatibilizer. The morphology of PP/PA6 blends and PP/PET blends wereanalysized by ESEM and image processing software. The crosslink actionof epoxy in PP melt was studied in torque rheometer. The melt flow indexand dynamic contact angle of PP/EPOXY blends in water were measured.The isothermal crystalline state of PP/PA6 blends, PP/ PET blends andPP/EPOXY blends were observed by polarizing microscope and theirmechanical properties were also tested. At last, the mechanical propertiesof the three systems were contrasted. PP/PA6 is a typical immiscible system. The compatibility wasimproved by adding two kinds of compatibilizer, and EPDM-g-GMA wasmore efficient. The dimension of PP spherulites minished with PA6content increasing. PA6 phase distributed among PP spherulites, and thecompatibility was improved by adding PP-g-MAH or EPDM-g-GMA. Thereactive compatibilization and rubber tougheness had cooperativeeffectiveness on PP/PA6 blends, after adding EPDM-g-GMA. The Yang’smodulus of PP/PA6 blends was improved after adding PP-g-MAH, at thesame time, the yield stress was higher than that of immiscible system. PP/PET is also a typical immiscible system. The compatibility wasimproved by adding two kinds of compatibilizer, and EPDM-g-GMA wasmore efficient. The dimension of PP spherulites minished after PP hadblended with PET . PET phase distributed among PP spherulites, and thecompatibility was improved by adding EPDM-g-GMA. PET crystal phasebecame finer after adding nucleating agent in PP/PET/EPDM-g-GMAblends. The reactive compatibilization and rubber tougheness hadcooperative effectiveness on PP/PET blends, furthermore, nucleatingagent takes advantage in improving toughness. The Yang’s modulus ofPP/PET blends was improved after adding PP-g-MAH, at the same time,the yield stress decrease slowly.<WP=5>Epoxy was likely to begin gelationization, which lift torque curve in10~15minute, and then Epoxy come into solidify period. After PP blendswith epoxy, the crystallization was baffled by crosslinking and thedimension of PP spherulites become small and illegible, at the same time,the hydrophilicity increase and the fluidity descend. The Yang’s modulusof uncompatibile system increase while the yield stress and toughnessdecrease. After adding PP-g-MAH, the Yang’s modulus of blend increasemore, and the yield stress increase slowly and toughness improve. The results of mechanical properties contrasting show thatPP/PA6/EPDM-g-GMA system was toughest, PP/PET/PP-g-MAH systemwas rigidest and PP/E-51/ 203#/PP-g-MAH system is best at yield stress.更多还原