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等规聚苯乙烯结构与性能研究进展 总被引:3,自引:0,他引:3
本文综述了等规聚苯乙烯的结构与性能的研究。着重讨论等规聚苯乙烯的差向立体异构化、结晶行为、凝胶特性及其机械力学性能与结构的关系,同时还讨论了等规聚苯乙烯的加工与应用前景。 相似文献
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基于构建的iPB-1与iPP的双层热压复合膜,设计两相界面结构,并通过撕裂实验、扫描电子显微镜(SEM)和透射电子显微镜(TEM),研究高温退火温度与结晶温度对iPB-1与iPP间界面结构和性能的影响.结果表明,iPB-1/iPP复合样品经退火处理后,界面黏结强度明显下降,且退火温度越高,界面黏结强度和撕裂面粗糙度均越低.另外,经高温退火及两步降温结晶(即iPP于130℃先结晶、iPB-1于60℃后结晶)后,样品的平均界面黏结强度、撕裂面粗糙度、界面层厚度均比经一步降温结晶(iPP和iPB-1于60℃同时结晶)后的更高,且出现iPB-1分子链向iPP相区扩散的界面相结构. 相似文献
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茂钛化合物/改性MAO催化剂制备聚丙烯-b-间规聚苯乙烯嵌段共聚物 总被引:3,自引:0,他引:3
以五甲基环戊二烯基三苄氧基钛化合物 [Cp Ti(OBz) 3 ]为主催化剂 ,改性甲基铝氧烷作助催化剂 ,采用单体顺序投入法 ,合成了聚丙烯 b 间规聚苯乙烯嵌段共聚物 .外加三异丁基铝可以使活性中心的氧化态由Ti(Ⅳ )还原为Ti(Ⅲ ) ,从而提高苯乙烯共聚单体的转化率 .实验表明此催化体系对共聚物的合成具有较高活性 ,适宜的茂钛化合物浓度可阻止活性中心被丙烯预聚物包埋 .抽除残余丙烯气也可促进苯乙烯的共聚合 .对聚合产物进行溶剂连续萃取 ,可分离出嵌段共聚物 ,并用 13 CNMR和DSC进行结构表征 相似文献
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等规聚丙烯/二元乙丙橡胶合金相分离对结晶动力学的影响 总被引:1,自引:0,他引:1
用小角激光光散射(SALLS)、相差显微镜(PCM)、示差扫描量热仪(DSC)和偏光显微镜(POM)研究了聚丙烯/二元乙丙橡胶(iPP/EPR)共混体系的相分离行为和等温结晶行为.发现iPP/EPR(50/50,W/W)发生的液-液相分离遵循spinodal机理.通过Cahn-Hilliard方程求得了不同实验温度下iPP/EPR的表观扩散系数(Dapp)以及spinodal温度(Ts).考察了不同相分离程度的iPP/EPR体系结晶动力学,发现延长相分离时间(tps)或提高相分离温度(Tps)均会导致半结晶时间(t1/2)增大,即结晶速率降低.这被归于EPR成核作用的降低.动力学分析结果表明Avrami模型适用于描述该体系的等温结晶过程,其结晶机理基本不受相分离程度的影响,结晶均以瞬时成核和三维生长为主. 相似文献
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全同立构聚丙烯的晶片形态 总被引:1,自引:0,他引:1
本文应用光学显微镜,扫描和透射电子显微镜从三种不同层次的结构水平上研究了α和β两种晶型的全同立构聚丙烯的球晶和晶片形态结构,特别是应用四氧化钌染色技术直接观察到两种不同晶型聚丙烯球晶中单独分离的晶片形态.结果表明,不同晶型聚丙烯球晶的形态是不同的,其所呈现的性质与其内部晶片结构的排列特征相对应.同时研究了两种晶型聚丙烯在熔体拉伸结晶条件下生成的晶片形态,倾向于相同的取向晶片结构.电子衍射数据证明了,β型聚丙烯在拉伸取向结晶时将转变为α晶型. 相似文献
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Jiang Li Qin Zhang Cong Wang Hong Yang Rong-ni Du Qiang Fu 《高分子科学》2006,(4):379-387
The effect of compatibility on phase morphology and orientation of isotactic polypropylene (iPP) blends under shear stress was investigated via dynamic packing injection molding (DPIM). The compatibility of iPP blended with other polymers, namely, atactic polypropylene (aPP), octane-ethylene copolymer (POE), ethylene-propylene-diene rubber (EPDM) and poly(ethylene-co-vinyl acetate) (EVA), have first been studied using dynamic mechanical analysis (DMA). These blends were subjected to DPIM, which relies on the application of shear stress fields to the melt/solid interfaces during the packing stage by means of hydraulically actuated pistons. The phase morphology, orientation and mechanical properties of the injection-molded samples were characterized by SEM, 2D WAXS and Instron. For incompatible iPP/EVA blends, a much elongated and deformed EVA particles and a higher degree of iPP chain orientation were observed under the effect of shear. However, for compatible iPP/aPP blends, a less deformed and elongated aPP particles and less oriented iPP chains were deduced. It can be concluded that the compatibility between the components decreases the deformation and orientation in the polymer blends. This is most likely due to the hindering effect, resulting from the molecular entanglement and interaction in the compatible system. 相似文献
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Chun-xiao Zheng Xiu-qin Zhang Joerg Rottstegge Xia Dong Ying Zhao Du-jin Wang Shan-nong Zhu Zhi-gang Wang Charles C. Han Duan-fu Xu 《高分子科学》2006,(6):569-573
Experimental miscibility studies were performed on different compositions of iPP/sPP blends, where sPP has a low syndiotacticity ([rrrr] = 81%). Combining optical microscopy, rheology, and solid state NMR spectroscopy, the miscibility of the blends was investigated at different scales in the traditionally thought to be "immiscible" iPP/sPP blends. For the composition of iPP/sPP (90/10) blend, it shows to be miscible in the melt, and furthermore, the existence of intermolecular chain interactions between sPP and iPP components was detected in the solid state. 相似文献
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利用流变学方法研究了剪切诱导等规聚丙烯(iPP)的等温结晶行为.在稳态剪切流场作用下,结晶初期的法向压应力和粘度基本为一定值,一定时间后,会出现增大并迅速上升的现象.在高剪切速率下,与粘度相比较,法向压应力突变的时间要早;剪切速率减小,二者趋于一致;当剪切速率很低时,法向压应力的值很小且超出了仪器的量程,只有粘度的值是可信的.针对该现象提出了一种新的结晶速率表征法,即利用法向压应力和粘度二者中较早的突变时间表征结晶诱导时间(ton).诱导应变γ=.γ.ton,q是决定剪切影响结晶行为的一个无量纲参数,可以将不同温度下的结晶诱导时间曲线组合成一条主曲线. 相似文献
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聚乳酸/羧基化聚丙烯共混物的形态与热性能研究 总被引:1,自引:0,他引:1
以扫描电子显微镜、热重分析仪、差示扫描量热仪、热台偏光显微镜分别研究了聚乳酸/羧基化聚丙烯共混体系的相形态、热性能和结晶形态.结果显示,共混物熔体冷却时,聚乳酸和羧基化聚丙烯均形成球晶,但羧基化聚丙烯球晶较大而十字消光较暗,聚乳酸球晶尺寸较小而十字消光较亮,且聚乳酸球晶产生规则的、不连续的同心环线——裂纹,裂纹厚度约为1~2μm,且裂纹内部有微纤存在.当聚乳酸含量≤50%时,由于聚丙烯上羧基的存在而使共混体系具有较好的相容性.共混物的热分解过程分为三个阶段,热分解温度的变化是聚丙烯上的羧基、聚乳酸和聚丙烯骨架分解三种机制共同作用的结果,少量聚乳酸能够明显提高共混物中聚丙烯上羧基的热稳定性.共混物中的羧基化聚丙烯组分可以发挥稀释剂的作用,大幅度降低了聚乳酸的冷结晶温度.聚乳酸含量≥50%时,共混熔体降温时DSC谱图中聚乳酸和羧基化聚丙烯分别结晶,而聚乳酸含量<50%时,只观察到羧基化聚丙烯的结晶行为. 相似文献
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本文利用对称理论,研究了全同立构聚丙烯的α(型)晶及β(型)晶的可能的晶体结构.1.推导了与C2/c空间群有关的有色空间群,研究了聚丙烯分子链在它们中的排布,得出其中5种是聚丙烯α(型)晶晶体结构可能存在的空间群;2.从晶畴理论出发,得出具有Cc空间群与P2_(1/c)空间群的两种晶畴共存于一个体系中,3.聚丙烯β(型)晶的晶体结构的可能排列方式是聚丙烯分子链按R型晶胞的半无规排列。 相似文献
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Juan Jia Dierk Raabe Wei-min Mao 《高分子科学》2006,(4):403-411
The orientation and crystallinity evolution of isotactic polypropylene (iPP) induced by rolling were studied using wide angle X-ray scattering with an area detector. The tensile mechanical properties of rolled isotactic polypropylene sheets were also measured in this work. The texture component method was used to analyze the rolling texture. The rolling texture consists mainly of (010)[001], (130)[001] and [001]//RD fiber components in the sample with a rolling true strain of 1.5. The results reveal that crystallinity drastically decreases during rolling. It is suggested that amorphization is a deformation mechanism which takes place as an alternative to crystallographic intralamellar slip depending on the orientation of the lamellae. Both the orientation and crystallinity affect the tensile mechanical properties of rolled polypropylene. Crystallinity influences the elastic modulus on both directions and yield strength on transverse direction at the first stage of deformation. Orientation is the main reason for the changes of mechanical properties, especially at the latter part of deformation. The changes of both tensile strength and elongation percentage on rolling direction are larger than those on transverse direction, which results from the orientation. At last, the anisotropic mechanical properties occur on the rolling and transverse direction: high tensile strength with low elongation percentage on rolling direction and low tensile strength with high elongation percentage on transverse direction. 相似文献