耐候性PP的研制

以聚烯烃弹性体（POE）为增韧材料、DICPK为结晶成核剂、BsSO4为无机填充剂，研制了耐候改性PP专用料。结果表明，当POE用量为5份、DICPK用量为0．3份、BaSO4用量为30份时，所得专用料能够满足耐候改性PP专用料的性能要求。     

聚丙烯微孔膜研究进展

聚丙烯（PP）是一种价格低廉的塑料，是目前最主要的制备高分子微孔膜的材料之一。笔者综述了近年来PP微孔膜制备方法的研究进展，重点介绍了熔纺拉伸法（MSCS）、热致相分离法（TIPS）、共混拉伸法、熔融烧结法等PP微孔膜的常用制备方法，并对相关的影响因素进行了讨论。     

透明成核剂对聚丙烯的非等温结晶行为的影响

采用热分析方法研究了透明成核剂TM-3对聚丙烯(PP)非等温结晶行为的影响,并与纯PP样品作了比较.结果表明,TM-3能够提高聚丙烯的结晶温度12℃左右;分别采用了Avrami和莫志深方法对非等温结晶过程作了分析处理;对含有成核剂的PP样品的非等温结晶行为分析显示,成核剂的加入改变了聚丙烯的结晶行为,使其成核与结晶生长过程复杂化.     

一步法硅烷接枝交联改性聚丙烯的研究

采用反应挤出法一步实现聚丙烯（PP）的硅烷接枝和交联改性，制备出了具有部分交联结构的高熔体强度PP。通过改性前后红外光谱、熔体流动性能、凝胶含量、结晶行为、力学性能和发泡性能的变化考察了改性对材料性能的影响。结果表明，一步法改性后PP大分子中引入了硅烷接枝交联结构，使熔体强度、熔体黏度提高，熔体流动速率显著降低，并且体系中出现了高达48％的凝胶；交联结构的引入使PP的结晶速率减缓；改性后材料的力学性能有所提高，而发泡性能大大改善，可以获得高质量的泡沫塑料。     

聚丙烯球形高效催化剂的工业应用研究

介绍了DQ-2型球形高效催化剂在间歇式液相本体法聚丙烯生产装置上进行工业应用的试验研究，试验证明，该催化剂具有节水、节电、反应平稳且操作时间短等聚合反应特性，催化剂活性平均为42kgPP／(gCat)，一级品率达90％，并与非球型高效催化剂进行了比较。     

反式—1，4—聚异戊二烯改性聚丙烯的研究

研究了反式－1，4－聚异戊二烯（TPI）的力学性能与交联的关系及不同产联度的TPI对PP的增韧效果。发现TPI能显著提高一种韧性PP（PP／EPDM）的冲击强度，使球晶细化，均一，讨论了其增韧机理。     

固相接枝共聚法制备PP—g—PS

用固相接枝共聚方法制备了聚丙烯接枝苯乙烯(PP-g-PS),详细地考察了聚丙烯与引发剂的品种、反应温度、苯乙烯及引发剂的浓度等因素对接枝率和接枝效率的影响。研究结果表明:PP-g-PS具有较高的接技率,应用于聚丙烯/聚苯乙烯(PP/PS)共混物中,能降低分散相PS的粒径,提高PP/PS的相容性。     

PE—g—MAH对PP／玻纤—硅灰石的增容作用

报道了聚乙烯接枝马来酸酐(PE-g-MAH)对玻璃纤维-硅灰石填允增强聚丙烯的增容效果。实验结果表明:选用合适接枝率的PE-g-MAH,PP/玻纤-硅灰石/PE-g-MAH共混物的力学性能随其用量的增加而明显提高,维卡耐热温度也得到提高。扫描电子显微镜观察断面的形态表明:PE-g-MAH的加入使填料在聚丙烯连续相中分散更均匀,且使断面变得粗糙,表明PE-g-MAH提高了相界面的作用力,对聚丙烯和填料起到了良好的增容作用。     

Microstructure and fracture behavior of polypropylene/barium sulfate composites

The microstructure, mechanical properties, and fracture behavior of polypropylene (PP)/barium sulfate (BaSO₄) composites were studied. Four composite samples with different PP‐BaSO₄ interface were prepared by treating the filler with different modifiers. The fracture behavior of the composites under different strain rates was studied by means of Charpy impact tests and essential work of fracture (EWF) tests. It is shown that a moderate interfacial adhesion is favorable for toughening, which ensures that the particles transfer the stress and stabilizes the cracks at the primary stage of the deformation, and satisfies the stress conditions of plastic deformation for matrix ligaments subsequently via debonding. Very strong interfacial adhesion is not favorable for toughness, especially under high strain rate, because the debonding‐cavitation process may be delayed and the plastic deformation of matrix may be restrained. © 2005 Wiley Periodicals, Inc. J Appl Polym Sci 99: 1207–1213, 2006     

Three‐dimensional thermorheological behavior of isotactic polypropylene across glass transition temperature

The aim of this work was to determine the three‐dimensional thermorheological behavior of isotactic polypropylene (i‐PP) in the region of its glass transition temperature (T_g) by a master curve. The i‐PP is a widespread polymer with a T_g ～ 0°C. Dynamic mechanical analysis (DMA) at varying frequencies and temperatures and bulk tests at varying temperatures and times are carried out to obtain the relaxation spectra. Traditionally, the combination of time and temperature is done for thermorheological simple material by the creation of a master curve based on the Arrhenius or William–Landel–Ferry (WLF) equation. This investigation shows that these equations do not fit the behavior across the glass transition of i‐PP. Instead, a new arc tangent function is derived. Additionally, it can be shown that the shifting factors differ from shear to bulk load. Therefore, the mode of mechanical stress seems to have an influence on the thermorheological behavior. © 2004 Wiley Periodicals, Inc. J Appl Polym Sci 94: 877–880, 2004