浸水时间对不同复合材料吸水率及其力学性能的影响(英文)  

VARIATIONS OF MOISTURE ABSORPITION AND MECHANICAL PROPERTIES OF DIFFERENT COMPOSITES WITH IMMERSION TIME IN WATER

作　　者：雷文[1] 宋长钱[1] 徐逸[1] 

机构地区：[1]南京林业大学,南京210037

出　　处：《玻璃钢／复合材料》2009年第6期19-24,共6页Fiber Reinforced Plastics/Composites

基　　金：江苏省高校自然科学研究项目(06KJD220083)

摘　　要：以不饱和聚酯树脂(UPR)为基体,玻纤布、苎麻布及碱式硫酸镁晶须为增强材料。采用模压工艺制备复合材料。研究了不同复合材料在30℃及50℃水中浸泡时间对其吸水率及其力学性能的影响。结果表明,所有复合材料的吸水率均随着浸泡时间的延长而逐渐增加,且在起初的0～8h时快速吸水,之后趋缓或不变;50℃时的吸水率总是高于30℃时的吸水率;玻纤布对UPR的增强效果明显优于苎麻布;与晶须混杂后将降低玻纤布或苎麻布增强聚合物复合材料的拉伸强度和冲击强度,但却将增加弯曲强度和拉伸模量;随着浸泡时间的延长,玻纤布增强或玻纤布与晶须混杂增强复合材料的拉伸强度在30℃和50℃时均将下降;苎麻布增强复合材料的冲击强度分别在30℃和50℃水温浸泡16h时达到最大值,分别为49.1kJ/m2和48.8kJ/m2,比浸水前的冲击强度分别提高98.78%和97.57%,而苎麻布与晶须混杂增强复合材料在两个试验温度下的冲击强度均随着浸泡时间的延长而单调增加。Unsaturated polyester resin （UPR） is used as matrix, glass fiber cloth, ramie fiber cloth and/or basic magnesium sulfated whisker are used as reinforcement to form composites by compression molding process. The variations of moisture absorption and mechanical properties of different composites with immersion time in water at 30℃ and 50℃ respectively were studied. The results show that, the water uptakes of all the composites increase with immersion time in water, the composites absorb water much fast from 0h to 8h, then relaxedly or unchanged. The water uptakes at 50℃ are always more than those at 30℃ ;the reinforcement of glass fiber cloth on UPR is far better than ramie cloth ; hybrid with whisker will decrease the tensile and impact strengths of the composites containing either glass cloth or ramie cloth, but increase their flexural strengths and tensile moduli. With the prolong of immersion time in water, the tensile strengths of the composites reinforced with glass cloth along or glass cloth and whisker together at 30℃ and 50℃ will decrease; the impact strengths of the composites reinforced with ramie cloth reach the maxima of 49. 1kJ/m^2 and 48.8 kJ/m^2 at 30℃ and 50℃ respectively when immersed in water for 16h, accordingly 98.78% and 97.57% increased from those before immersion, and the impact strengths of the composites reinforced with the hybrid of ramie cloth and whisker increase monotonously with time at the two temperatures through the whole water immersion test.

关 键 词：复合材料 不饱和聚酯树脂 玻纤布 苎麻布 碱式硫酸镁晶须 吸水率 力学性能 

分 类 号：TB332[一般工业技术—材料科学与工程]