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中文摘要：
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8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G晶，同时高压振动注射有利于形成了晶。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。
英文摘要：
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.
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