Fabrication of Continuous Fiber-reinforced Thermoplastic Composites from Sheath-core Type Bicomponent Fibers.
Fabrication of Continuous Fiber-reinforced Thermoplastic Composites from Sheath-core Type Bicomponent Fibers.
复制标题
用皮芯型双组分纤维制造连续纤维增强热塑性复合材料。
DOI：
10.4325/seikeikakou.9.920
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发表时间：
1997
期刊：
影响因子：
--
通讯作者：
J. Radhakrishnan
中科院分区：
文献类型：
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作者：
T. Furuta;Hiroshi Ito;T. Kikutani;N. Okui;J. Radhakrishnan
采用高速熔融纺丝工艺制备了以聚对苯二甲酸乙酯（PET）为护套组分，以热致液晶聚合物（LCP）为核心组分的套芯型双组分纤维，并以此为基础制备了连续纤维增强热塑性复合材料。通过与PET共加工，提高了LCP的可加工性，与LCP单组分纺丝相比，PET/LCP双组分纤维中LCP组分的拉伸模量和强度得到了提高。广角x射线衍射结果表明，与双组分纤维相比，热塑性复合材料中LCP组分的分子取向没有发生变化。PET/LCP双组分纤维的拉伸模量和强度与热塑性复合材料相似。为了将纤维纺丝工艺与热塑性复合材料的加工相结合，在纺丝过程中不断改变双组分纤维的皮芯组成，制备了纤维含量呈梯度结构的热塑性复合材料。在三点弯曲试验中，复合材料的力学性能随载荷方向的不同而不同。我们所制备的复合材料的这种行为与具有非常相似结构的竹子的行为相似。
Sheath-core type bicomponent fibers consisting of poly (ethylene terephthalate) (PET) as a sheath component and thermotropic liquid crystalline polymer (LCP) as a core component were prepared by a high-speed melt spinning process, and continuous fiber-reinforced thermoplastic composites were fabricated from these fibers. The processability of LCP was improved by co-processing with PET, and tensile modulus and strength of the LCP component in the PET/LCP bicomponent fibers were enhanced in comparison with LCP single component spinning. Wide-angle X-ray diffraction patterns showed that the molecular orientation of LCP component in thermoplastic composites did not change as compared to those in the as-spun bicomponent fibers. The tensile modulus and strength of PET/LCP bicomponent fibers and thermoplastic composites were also similar. To combine the fiber spinning process with the thermoplastic composites processing, thermoplastic composites with a structural gradient in fiber content were also fabricated from the bicomponent fibers in which sheath-core composition was continuously changed during the spinning process. In the three-point bending test of these composites, different mechanical behavior, depending on load direction, appeared. This behavior of the composites prepared in our study is similar to that of bamboo which has a very similar structure.