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作 者:周起雄[1] 杨良波[1] 申开智[1] 张杰[1]
机构地区:[1]四川大学高分子科学与工程学院,高分子材料工程国家重点实验室,四川成都610065
出 处:《中国塑料》2009年第4期68-70,共3页China Plastics
基 金:国家自然科学基金资助项目(50873072);国家基础研究专项经费资助项目(2005CB623800);国家重点实验室专项经费资助项目
摘 要:采用自行研制的振动装置研究了压力振动对全同聚丙烯(IPP)凝聚态和晶型的影响。在IPP注射成型中引入振动场,通过WAXD测试发现振动带来的剪切能诱导β晶的生成,但存在一个最佳值,当超过这个值后,高的振动压力会破坏亚稳态的β晶,同时高压振动注射有利于形成γ晶。SEM分析表明振动注塑对试样表层影响不大,而使得芯层球晶在流动方向上发生了取向变形。对不同振动条件下试样芯层进行了POM观测,结果显示与常规注塑样品相比,振动样品中IPP球晶在振动方向上被拉伸取向,晶核密度增加,尺寸减小,并且在压力振幅较大的样品中振动的影响更为显著。在振动压力为50MPa的样品中,生成了大量纤维状晶体,说明在此振动压力下芯层结构消失,剪切层成为主导结构。In this paper, the effect of vibration on the morphology and crystal modification of iPP was studied using a self-made vibration injection molding device. WAXD showed that vibrated shear force induced the formation of β crystal up to a threshold value of shear force. When the threshold was exceeded, β form crystal would be destroyed. High pressure vibration injection was propitious to the formation of γ crystal. According to SEM observation, vibration caused orientation of spherulites in the core layer along flow direction; however, had little effect on the surface layer. POM revealed that the spherulite in the core layer was orientated and exhibited a larger density by vibration. These effects became more effective at higher vibration pressures. Under a high vibration pressure of 50 MPa, a large quantity of fibril crystal was observed, which meant in this case the shear layer became predominant.
分 类 号:TQ325.14[化学工程—合成树脂塑料工业]
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