In-situ microfiber reinforced composite based on PET and PE via slit die extrusion and hot stretching:: Influences of hot stretching ratio on morphology and tensile properties at a fixed composition
In-situ microfiber reinforced composite based on PET and PE via slit die extrusion and hot stretching:: Influences of hot stretching ratio on morphology and tensile properties at a fixed composition
复制标题
DOI：
10.1002/pen.10050
复制
发表时间：
2003-03-01
影响因子：
3.2
通讯作者：
Huang, R
中科院分区：
文献类型：
--
作者：
Li, ZM;Yang, MB;Huang, R
采用狭缝模挤压-热拉伸法制备了聚对苯二甲酸乙二醇酯（PET）和聚乙烯（PE）原位微纤维增强复合材料（MRC）。在PE基体的加工温度下，通过注射成型制备试样。在这个温度下，远低于PET的熔化温度，PET相是固体的，在加工过程中能够保持其形状。当PET和HDPE的重量固定（15:85）时，共混物中分散PET相的形态特征取决于热拉伸比。当热拉伸比从1（无拉伸）增加到47.62时，PET颗粒由球状、椭球状变为棒状颗粒，最后变为微纤维状。PET颗粒的最大直径和平均直径逐渐减小，而纤维的最小直径保持不变。随着热拉伸比的增加，PET/PE共混物的拉伸模量和强度显著提高，表明其具有良好的补强性。极限伸长率随热拉伸比的增加而降低，并存在一个临界热拉伸比，超过该临界热拉伸比后发生韧脆转变。
An in-situ microfiber-reinforced composite (MRC) based on polyethylene terephthalate) (PET) and polyethylene (PE) was prepared by slit die extrusion followed by hot stretching. Test specimens were prepared by injection molding at the processing temperature of the PE matrix. At this temperature, far below the melting temperature of PET, the PET phase is solid and able to keep its shape during processing. The morphological characteristics of the dispersed PET phase in the blend, at a fixed weight composition (15:85) of PET and HDPE, were dependent upon the hot stretching ratio. When the hot stretching ratio was increased from I (no stretching) to 47.62, the PET particles changed from spheres and ellipsoids to rodlike particles and finally to microfibers. The maximum and average diameters of the PET particles decreased steadily, while the minimum fiber diameter remained constant. The tensile modulus and strength of PET/PE blends were significantly enhanced with increasing hot stretching ratio, indicating that the microfibers have good reinforcement. Ultimate elongation decreased with increasing hot stretching ratio and there was a critical hot stretching ratio above which a ductile-brittle transition occurred.