聚烯烃接枝马来酸酐接枝率的测定—聚乙烯接枝

以非均相化学接枝法和红外光谱法相结合的方法绘制了定量校正曲线,可用于红外光谱法测定聚乙烯接枝马来酸酐的接枝率。该方法简便快速,准确可靠,重复性好。     

动态全硫化共混型热塑性弹性体的研究进展

阐述了动态全硫化共混型热塑性弹性体（TPV）的发展历史，微观形态结构及其形成机理，制备技术，主要的品种及其加工和应用。     

改性SBS胶粘剂的研制

以丙烯酸酯类混合单体对SBS热塑性弹性体在混合溶剂中接枝共聚，添加混合型增粘树脂，研制成接枝改性的SBS胶粘剂，具有较高的初粘力和终强度。探讨了单体比例、引发剂用量、反应温度、反应时间、增粘树脂对胶液性能的影响。     

CacO3在PP和PP/mPE共混物基体中的作用比较

研究CaCO3填料在取丙烯（PP）和茂金属聚乙烯（mPE)弹性体增韧PP共混物（PP／mPE)2种基体中的不同作用。结果表明：在PP基体中，填料显著提高其刚性，而在共混物基体中，由于弹性体的存在，填料的增强作用减弱；弹性体能够改善填料粒子和基体的界面粘合，增大弹性体分散相的尺寸，使PP/mPE共混物的拉伸断裂韧性提高。低温下（－30℃）的Charpy缺口冲击实验表明：少量的CaCO3即可导致PP/mPE体系冲击强度的迅速下降。     

动态三螺杆挤出机制备热塑性硫化胶的研究

对比分析了动态热塑性硫化胶(TPV)的加工设备,着重介绍了附加振动力场的三螺杆反应挤出机的结构特点以及利用该机进行三元乙丙橡胶/聚丙烯(EPDM/PP)的动态全硫化,对制品的物理力学性能和微观结构分别进行了测试分析和电镜扫描。结果表明,振动力场作用下EPDM/PP共混体系反应挤出动态硫化加工可有效地实现动态硫化反应、硫化橡胶的粉碎和分散以及相态反转,振动力场的作用明显提高了TPV性能。     

Structure–property relationships of poly(urethane urea)s with ultra‐low monol content poly(propylene glycol) soft segments. I. Influence of soft segment molecular weight and hard segment content

Structure–property relationships in poly(urethane urea)s synthesized with ultra‐low monol content poly(propylene glycol) soft segments were investigated as soft segment molecular weight (2000, 4000, and 8000 g/mol) and hard segment content (6.3 and 9.0 wt %) were varied. Morphological features such as interdomain spacing and interphase thickness were quantified and revealed with small‐angle X‐ray scattering (SAXS) and atomic force microscopy (AFM). The thermal and mechanical behavior was assessed with a dynamic mechanical analyzer (DMA) and by differential scanning calorimetry (DSC) and stress‐strain tests. Hard segment content, over the limited range studied, had little effect on the morphology and soft segment thermal and mechanical properties. The molecular weight of the soft segments had considerably more influence on the morphology and mechanical properties. Increasing soft segment molecular weight resulted in greater interdomain spacings, as shown by SAXS, and a noticeable change in the structure, as shown by AFM. Additionally, as soft segment molecular weight decreased the soft segment glass transition broadened and rose to higher temperatures. © 2002 Wiley Periodicals, Inc. J Appl Polym Sci 84: 229–243, 2002; DOI 10.1002/app.10168     

CaSO4晶须/聚氨酯弹性体复合材料性能的研究

笔者主要研究了CaSO4晶须对聚氨酯弹性体复合材料热性能和摩擦性能的影响。随Ca-SO4晶须含量的增加，复合材料的起始分解温度被提高，加入CaSO4晶须并未改变聚氨酯弹性体的化学结构，只是减慢了聚氨酯弹性体的热失重速率；随着CaSO4晶须含量的增加，聚氨酯弹性体复合材料的磨耗量降低。分析认为，加入CaSO4晶须后。阻止了聚氨酯弹性体结构的大面积破坏，改变了磨屑的形成机理，使其由纯聚氨酯的大的片状磨屑变为复合材料的小磨屑，从而降低了聚氨酯复合材料的磨损。     

POE和T-ZnOw协同改性聚丙烯的研究

以聚丙烯（PP）、热塑性弹性体（POE）、四针状氧化锌晶须（T-ZnOw）为原料，制备了PP／POE／T-ZnOw复合材料；研究了复合材料的结晶结构和力学性能。结果表明：T-ZnOw能诱导β晶型的生成，在快速冷却的条件下POE也能诱导生成β晶型。随着T-ZnOw含量的增加，PP／POE／T-ZnOw复合材料的冲击性能不断提高。T-ZnOw含量为20％时，PP／POE／T-ZnOw的冲击强度比纯PP提高了82.5％；拉伸强度和断裂伸长率先增加后降低。T-ZnOw的加入还能很好地改善复合材料的熔体流动性能。     

Structural characterization of reactor blends of polypropylene and ethylene‐propylene rubber

Blends of isotactic polypropylene (PP), ethylene‐propylene rubber copolymer (EPR), and ethylene‐propylene crystalline copolymer (EPC) can be produced through in situ polymerization processes directly in the reactor and blends with different structure and composition can be obtained. In this work we studied the structure of five reactor‐made blends of PP, EPR, and EPC produced by a Ziegler‐Natta catalyst system. The composition of EPR was related to the ratio between ethylene and propylene used in the copolymerization step. The ethylene content in the EPR was in the range of 50–70 mol %. The crystallization behavior of PP and EPC in the blends was influenced by the presence of the rubber, and some specific interactions between the components could be established. By preparative temperature rising elution fractionation (P‐TREF) analysis, the isolation and characterization of crystalline EPC fractions were made. © 2004 Wiley Periodicals, Inc. J Appl Polym Sci 92: 2155–2162, 2004     

Surface characterization of cross-linked elastomers by shear modulation force microscopy

Brominated poly(isobutylene-co-4-methylstyrene) (BIMS) is a synthetic terpolymer which can be stoichiometrically cross-linked by N,N′-dicinnamylidene-1,6-hexanediamine (DIAK). The degree of cross-links on bulk samples was determined by measuring the low frequency shear modulus with parallel plate method. The surface modulus of the same samples was measured using a new method, shear modulation force microscopy (SMFM). The moduli of the bulk sample and the surface were found to have the same scaling with the cross-link density, and good agreement with rubber elasticity theory was obtained in both cases. The SMFM was then used to monitor the cross-linking process, as a function of DIAK concentration and curing time, in thin films where standard rheological methods cannot be applied. The results show that in all cases the cross-linking reaction at the surface reaches saturation in less than 10 min as compared to at least 1 h in the bulk samples.