材料加工形态学7-2注塑-形态.ppt
The Crystallinity of different positions across the thickness direction of the part,Fibrillar crystals,Spherulites,Size of crystals,Phase orientation in multi-phase polymers相形态,Shear stress distribution in a mold,Skin-core structure(1),Schematic of the skin/core structure of injection-moulded parts:(a)non-compatibilized blend;(b)compatibilized blend,S.Fellahi,et al.morphological stability in injection-moulded high-density polyethylene/polyamide-6 blends,Polymer,1996,37(13):2615-2626,Where would you gate this part?,Weldline 熔接痕,Weld line,*Source:,Weld line,Mold Filling,Gate,Solidified part,S.Fellahi,et al.morphological stability in injection-moulded high-density polyethylene/polyamide-6 blends,Polymer,1996,37(13):2615-2626,Schematic representation of weldline structure:(a)non-compatibilized blend;(b)compatibilized blend,Phase morphology near weldline,Skin-core structure,注塑聚合物制品的不足：如内部缩孔表面凹陷熔接痕内应力大翘曲变形等制品性能与理论值相差很远,充满矛盾的注塑过程和性能不高的注塑成型制品。,Flow fountain,Causes,Nonuniform shear rate,在热流道板上加了两支动态保压活塞，使型腔中物料在剪切力场中逐渐冻结成型。,动态保压注塑（DPIM）,HDPE(5000S)的拉伸强度可从23.0MPa提高到93.0MPa，提高300。iPP的拉伸强度在纵横方向上从32MPa提高到63MPa,Zhong-Ming Li,Wei Yang,Shuying Yang,Rui Huang,Ming-Bo Yang.Journal of Materials Science,“Morphology-tensile behavior relationship in injection molded poly(ethylene terephthalate)/polyethylene and polycarbonate/polyethylene blends(I):skin-core structure”,2004,39:413-432Zhong-Ming Li,Bang-Hu Xie,Shuying Yang,Rui Huang,Ming-Bo Yang.Journal of Materials Science,“Morphology-tensile behavior relationship in injection molded poly(ethylene terephthalate)/polyethylene and polycarbonate/polyethylene,2004,39:432-443Zhong-Ming Li,Cheng-Guang Huang,Wei Yang,Ming-Bo Yang,Macromolecular Materials and Engineering,“Morphology dependent double yielding in injection molded polycarbonate/polyethylene blend”,2004,289:1004-1011,本课题组主要内容将在如下刊物发表,一张图片被确定为Journal of Materials Science的封面,Ah!Its made from PLASTICS!,
