【摘要】 采用复合挤出与口模拉伸技术制备了共聚聚丙烯(coPP)/等规聚丙烯(iPP)自增强线材,以此为增强体、coPP为基体,经热压成型制备高强全聚丙烯复合板材,并考察其力学性能、动态力学性能、可回收性。结果表明,复合板材的拉伸强度和弯曲强度分别可达160 MPa和63 MPa;增强体的加入使板材的储能模量大幅度提高、损耗因子降低;25%(质量分数,下同)增强体复合板经粉碎、造粒、重新热压得到的回收板材的拉伸强度仅下降7.3%,弯曲强度几乎没有损失,其内部coPP与iPP的相容性良好,复合板材的可回收性能优异。更多还原

【Abstract】 A type of copolymer polypropylene(coPP)/isotactic polypropylene(iPP) self-reinforced wire material was prepared by composite extrusion and die drawing.A high-strength all-polypropylene composite sheet was prepared via hotpressing with this wire material as a reinforcement and coPP as a matrix,and its mechanical properties,dynamic mechanical properties,and recyclability were investigated.The results indicated that the tensile strength and bending strength of the composite sheet reached 160 MPa and 63 MPa,respectively.The addition of the reinforcement greatly improved the energy storage modulus of the composite sheet but reduced its loss factor;A recycled sheet was obtained through pulverizing,granulating and hot-pressing with 25 wt% of reinforced composite board.Its tensile strength decreased by only7.3%,and there was almost no loss in its bending strength.The internal coPP and iPP had good compatibility,indicating good recyclability of the composite sheet.更多还原