共查询到16条相似文献，搜索用时 406 毫秒
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聚丙烯纤维对木／塑纤维复合材料性能影响的初步研究 总被引：8，自引：2，他引：8
对木／塑纤维复合材料组分中添加聚丙烯纤维和对聚丙烯纤维进行预处理引起材料物理力学性能和模压性能的变化进行了研究。试验结果表明，添加聚丙烯纤维有助于改善材料的模压性能，但导致材料物理力学性能下降。对聚丙烯纤维进行预处理有助于提高复合材料物理力学性能。 相似文献
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为探索纳米CaCO3对增强生物可降解复合材料力学性能的影响,采用混炼、注射成型工艺制备纳米CaCO3改性木纤维/聚乳酸复合材料,研究了纳米粒子添加量（1wt%,2wt%,3wt%,4wt%）及粒子预处理（偶联剂,硬脂酸,偶联剂-硬脂酸）对材料拉伸性能与冲击性能的影响。随着CaCO3添加量增加,复合材料力学强度先增大后减小,质量分数2%时材料拉伸强度和冲击强度分别提高8%与20%,粒子的增韧效果明显。预处理不仅能增强木纤维与聚乳酸的结合,也提高了纳米粒子分散性,增强材料整体力学性能。纳米粒子在聚合物基体中的分散性及其与聚合物界面结合是影响材料性能的关键。 相似文献
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采用捏合法制备木纤维-聚乳酸(WF-PLA)复合材料。通过凝胶色谱法(GPC)和差示扫描量热法(DSC)研究捏合温度和木纤维水分对WF-PLA生物质复合材料中聚乳酸分子质量及热性能的影响。结果表明:捏合温度对WF-PLA生物质复合材料中PLA性能影响显著。随着捏合温度由180℃升高到200℃,WF-PLA复合材料中PLA的重均分子质量(M珚w)明显下降,数均分子质量(M珚n)在200℃时也明显下降,在190℃时,PLA分子多分散系数最小。不同捏合温度的WF-PLA复合材料中,PLA熔融温度略有不同,熔融温度变化与PLA分子质量相关。木纤维水分对捏合法制备的WF-PLA复合材料中PLA的分子质量和热性能的影响不显著。 相似文献
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添加丙纶纤维及其改性处理对木塑复合材料性能的影响 总被引：3，自引：0，他引：3
就木塑纤维复合材料组分中添加丙纶纤维和对丙纶纤维进行改性预处理,改性剂的种类及改性剂的添加方式等引起材料物理力学性能和成网性能、模压性能的变化进行了研究。试验表明：添加丙纶纤维有助于改善材料的成网性能,使之成为具有良好模压性能的材料;对丙纶纤维进行改性的预处理可提高复合材料的物理力学性能;改性剂添加到木纤维中的工艺过程比对丙纶纤维进行预处理的工艺过程简单,并可以达到对丙纶纤维进行预处理的相同效果。 相似文献
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竹节对竹材力学强度影响的研究 总被引：9，自引：2，他引：9
本文对毛竹和刚竹的带节材与不带节竹材的主要力学性质研究表明,带节竹材的抗弯强度、顺纹抗压、抗剪、抗拉强度和冲击韧性都有一定程度降低的趋向,但抗劈开强度和横纹抗拉强度却有明显提高。影响竹材力学强度的主要因素是维管束数量、维管束排列方向及维管束中纤维的力学强度,了解这些规律,对复合材料的结构仿生有重要参考作用。 相似文献
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使用DSC对纯聚乳酸（PLA）、木纤维（WF）/PLA复合材料的熔融和非等温结晶过程进行测定和分析。结果显示木纤维的加入一定程度上会在影响PLA的结晶性能,能够促进PLA的异相成核从而提高其结晶度,但晶核密度的增加会减小晶核之间的空间从而阻碍结晶生长,并且降低结晶的生长速率。本研究还分别采用Avrami方程和莫志深方法对实验结果进行分析,结果表明在非等温结晶过程中,降温速率对PLA结晶性能的影响比较显著。降温速率越快,材料的结晶温度越低,形成结晶的形态也越不一致,结晶度也越低。 相似文献
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Since the structure of oil palm wood varies dramatically, the property gradients of oil palm wood within a trunk are of great interest. In this study, the physical (density, water uptake and swelling in the radial direction) and mechanical properties (bending modulus of elasticity and strength, compressive modulus of elasticity and strength in the direction parallel to the fiber, compressive strength in the direction perpendicular to the fiber and shear strength in the direction parallel to the fiber) of oil palm wood for a whole trunk were examined. The water uptake, compressive strength in the direction perpendicular to the fiber, shear strength in the direction parallel to the fiber, bending modulus of elasticity and strength and compressive modulus of elasticity and strength in the direction parallel to the fiber appeared to be independent of trunk height but tended to be related to the relative distance from surface or density by a single master curve. However, the swelling in the radial direction of the oil palm wood was not correlated with the relative distance from the surface, trunk height or density. Finally, property map of oil palm wood for a cross section at any height was prepared for practical use. 相似文献
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Preparation of acetylated wood meal and polypropylene composites II: mechanical properties and dimensional stability of the composites 总被引：2，自引：0，他引：2
Acetylated wood meals of Sugi (Cryptomeria japonica D.Don) wood were prepared by mechanochemical processing using a high-speed vibration rod mill. Weight percent gain (WPG) of the acetylated wood meals ranged from 7.0 to 35.5 %. Wood–plastic composites (WPCs) containing 50 % acetylated woods were produced by an injection molding technique. The polymer matrix used was polypropylene homopolymer. Maleic anhydride-grafted polypropylene (MAPP) was also used as a compatibilizing agent. The mechanical properties of WPCs in bending and tensile tests were independent of WPG of acetylated wood meals, and the test values for WPCs containing acetylated wood meals were lower than that of unmodified wood meal. The use of MAPP increased bending and tensile strength, but no effect on bending modulus was found. An increase in WPG significantly decreased water absorbability and thickness swelling of WPCs as measured by dimensional stability tests. These results demonstrated that mechanochemical processing is a promising technique for preparing WPC material with improved dimensional stability. The future challenge is to inhibit the decreases in mechanical properties of WPCs containing acetylated wood meals. 相似文献
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Kouichi SETOYAMA 《中国林业科技(英文版)》2002,(4)
The effect of wood species (Chinese fir and Poplar), wood fiber content (10%, 25%, 40%) and wood fiber sizes (16 to 32 mesh, 32-65 mesh, above 65 mesh) on the properties of the wood fiber-Polypropylene composites were studied in this paper. The results indicate that the effect of wood fiber content and size in composite were more important than that of chosen wood species. Compared with polypropylene without wood fiber, the flexural strength of the composites increased when adding wood fiber into polypropylene, but the tensile and unnotched charpy impact strength decreased. And the above strength decreased with the wood fiber content increasing. When the wood fiber size becoming smaller (in higher mesh), the strength increased. In the comparison of wood species, the properties of composite using Chinese fir wood were better than that of Poplar, but not significant. The dynamic mechanical properties of the composites and PP were also tested and analyzed in this paper. 相似文献