Effect of the type of nylon chain‐end on the compatibilization of PP/PP‐GMA/nylon 6 blends

Polyamide and polypropylene (PP) are two important classes of commercial polymers; however, their direct mixing leads to incompatible blends with poor properties. Polypropylene functionalized with glycidyl methacrylate (PP‐GMA) was used as a compatibilizer in blends of PP and nylon 6, because of the possible reaction of ? NH₂ and ? COOH groups with the epoxide group of GMA. Two types of nylon 6 with different ratios between ? NH₂ and ? COOH groups were used. The one with higher concentration of ? COOH groups was less compatible with PP in a binary blend. When PP‐GMA was used as a compatibilizer, a better dispersion of nylon in the PP matrix was obtained together with better mechanical properties for both nylons used in this work. © 2001 Society of Chemical Industry     

Development of antimicrobial polypropylene sutures by graft copolymerization. II. Evaluation of physical properties,drug release,and antimicrobial activity

Polypropylene (PP) sutures are prepared by the simultaneous radiation grafting of 1‐vinylimidazole (VIm) onto PP monofilament sutures. The tenacity slightly decreases whereas the elongation increases with the increase in the degree of grafting. Thermogravimetric analysis shows that the stability of the sutures is enhanced by the grafting process. The grafted sutures have reasonably good water uptake. They are subsequently immobilized with an antimicrobial drug, ciprofloxacin. The modified suture releases the drug over a period of 4–5 days. The antimicrobial activity of the modified suture is determined against Esherichia coli by the zone of inhibition technique. A clear zone of inhibition is observed around the drug‐containing suture. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 103: 3534–3538, 2007     

辐照法制全硫化聚丙烯/丙烯酸酯热塑性弹性体

用辐照法制备了全硫化聚丙烯，丙烯酸酯热塑性弹性体．对其物理机械性能、耐热油性进行了测试。结果表明，所制备的热塑性弹性体的性能优于动态硫化法。橡胶质量分数为30％、40％时，拉伸强度分别达到10．9MPa、13．6MPa，断裂伸长率分别为132％、157％；在10HD℃的油中浸泡70h。体积变化率只有28％。采用透射电子显微镜和扫描电子显微镜研究了所制备弹性体的微观形态，弹性体中橡胶粒子小、分散均匀；辐照后橡胶粒子与聚丙烯界面之间的作用力得到加强。     

PP-g-MAH增容PP/PA66共混物的形态结构和性能

用固相接技法制备了马来酸酐接枝改性聚丙烯(PP-g-MAH),研究了PP-g-MAH增容PP/PA66共混物的形态结构和性能。结果表明,未用PP-g-MAH增容的PP/PA66共混物是热力学不相容的海岛型两相结构,而用PP-g-MAH增客的PP/PA66共混物虽是两相结构,但分散相粒子尺寸大大减小,PP-g-MAH对PP/PA66共混物实现了反应性增容。与不含PP-g-MAH的PP/PA66共混物相比,PP-g-MAH增容的PP/PA66共混物的拉伸强度提高约10 MPa,弯曲强度提高约10 MPa,弯曲模量增加10％,缺口冲击强度和伸长率保持不变。     

硅酸盐矿物复合填充聚丙烯树脂的研究

探讨了不同种类的硅酸盐矿物、不同的用量以及之间的复合填充体系对聚丙烯树脂的物理及加工性能的影响。提出经硅烷偶联剂处理的硅灰石纤维和云母适当比例填充聚丙烯体系后，综合性能最佳。     

等通道转角挤出制备自增强等规聚丙烯的结构与性能研究

采用等通道转角挤出方法对等规聚丙烯进行自增强挤出,研究和分析挤出工艺条件与材料结构、性能之间的关系。利用广角X-射线衍射、差示扫描量热分析等手段对材料结构进行表征。结果表明:经过等通道转角挤出后等规聚丙烯的结晶度提高、晶粒细化、熔点提高,形成明显的取向结构,经过3次等通道转角挤出,等规聚丙烯的拉伸强度由挤出前的17.13MPa提高到59.38MPa。     

茂金属催化剂及其聚合物的进展

茂金属催化剂是近年出现的新型催化剂，技术进步很快。应用此催化剂生产的聚烯烃产量快速增加，正逐渐挤占非茂金属聚烯烃市场，而国内还没有茂金属聚烯烃的生产，产业前景广阔。推介了国外发展该技术及其产业的一些做法。     

PP塑料底材处理剂的研制及应用

以氯化聚丙烯为主要原料,制备了一种环保型的聚丙烯塑料底材表面处理剂。讨论了树脂基料、溶剂、乳化剂的选取及配比等因素对涂层附着力的影响,确定了处理剂的最佳配方。经试验测试,聚丙烯塑料表面经处理剂处理后,其涂层的附着力显著提高。     

Tensile properties of hollow glass bead‐filled polypropylene composites

The tensile properties of polypropylene (PP) filled with hollow glass beads have been measured at room temperature to identify the effects of the particle contents, size and its distribution on them in the present article. The mean diameters of the fillers were 11, 35, and 70 μm, and they were named as TK10, TK35, and TK70 respectively. The surface of these particles was pretreated with silane coupling agent. The results showed that the yield stress (σ_y) decreased gently for PP/TK70 systems, whereas decreased relatively obviously for PP/TK35 systems with increasing the volume fraction (?_f) of the fillers. When ?_f was less than 5%, the tensile strength at break (σ_b) of the composites increased with the increase of ?_f. When ?_f was more than 5%, σ_b was almost a constant for PP/TK70 systems, while σ_b decreased linearly for PP/TK35 systems. The tensile fracture strain (ε_b) of the composites decreased suddenly when ?_f was less than 5%, and then decreased slightly with increasing ?_f. When ?_f was 10%, σ_y and σ_b increased while ε_b decreased with the increase of the bead diameter. Furthermore, the σ_y was predicted by means an equation proposed in the previous work, and good interfacial adhesion was shown between the hollow glass beads and the matrix. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci 104: 1697–1701, 2007     

YS-842催化剂在Hypol工艺PP中试装置上的应用

将Ziegler-Natta高效载体催化剂YS—842在Hypol工艺聚丙烯(PP)中试装置上进行应用考核，考察了该催化剂的适应性及共聚合性能。试验表明，YS—842催化剂活性高(达1．2Mg／g)、寿命长、氢调敏感性好：用YS—842催化剂生产的聚合物流动性好，粒径分布窄，细粉少，平均粒径为640μm；等规指数大于98．5％，堆密度大于0．45g／mL；试生产的F401、J340，其机械性能与使用进口催化剂生产的产品相当。