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。
The mechanical properties of polypropylene were improved by
reactive blending with a few nylon6, polyethylene terephthalate, epoxy
and compatibilizer.
The morphology of PP/PA6 blends and PP/PET blends were
analysized by ESEM and image processing software. The crosslink action
of epoxy in PP melt was studied in torque rheometer. The melt flow index
and dynamic contact angle of PP/EPOXY blends in water were measured.
The isothermal crystalline state of PP/PA6 blends, PP/ PET blends and
PP/EPOXY blends were observed by polarizing microscope and their
mechanical properties were also tested. At last, the mechanical properties
of the three systems were contrasted.
PP/PA6 is a typical immiscible system. The compatibility was
improved by adding two kinds of compatibilizer, and EPDM-g-GMA was
more efficient. The dimension of PP spherulites minished with PA6
content increasing. PA6 phase distributed among PP spherulites, and the
compatibility was improved by adding PP-g-MAH or EPDM-g-GMA. The
reactive compatibilization and rubber tougheness had cooperative
effectiveness on PP/PA6 blends, after adding EPDM-g-GMA. The Yang’s
modulus of PP/PA6 blends was improved after adding PP-g-MAH, at the
same time, the yield stress was higher than that of immiscible system.
PP/PET is also a typical immiscible system. The compatibility was
improved by adding two kinds of compatibilizer, and EPDM-g-GMA was
more efficient. The dimension of PP spherulites minished after PP had
blended with PET . PET phase distributed among PP spherulites, and the
compatibility was improved by adding EPDM-g-GMA. PET crystal phase
became finer after adding nucleating agent in PP/PET/EPDM-g-GMA
blends. The reactive compatibilization and rubber tougheness had
cooperative effectiveness on PP/PET blends, furthermore, nucleating
agent takes advantage in improving toughness. The Yang’s modulus of
PP/PET blends was improved after adding PP-g-MAH, at the same time,
the yield stress decrease slowly.
Epoxy was likely to begin gelationization, which lift torque curve in
10~15minute, and then Epoxy come into solidify period. After PP blends
with epoxy, the crystallization was baffled by crosslinking and the
dimension of PP spherulites become small and illegible, at the same time,
the hydrophilicity increase and the fluidity descend. The Yang’s modulus
of uncompatibile system increase while the yield stress and toughness
decrease. After adding PP-g-MAH, the Yang’s modulus of blend increase
more, and the yield stress increase slowly and toughness improve.
The results of mechanical properties contrasting show that
PP/PA6/EPDM-g-GMA system was toughest, PP/PET/PP-g-MAH system
was rigidest and PP/E-51/ 203#/PP-g-MAH system is best at yield stress.
引文
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