PE/PP共混物熔融接枝马来酸酐的研究

研究了聚乙烯(PE)和聚丙烯(PP)共混物接枝马来酸酐(MAH)时，引发剂(DCP)、接枝单体(MAH)和PP用量对接枝率的影响。结果表明，DCP与MAH的交互作用是影响接枝率的重要因素，在低DCP、MAH用量时，它们之间的交互作用并不明显，当用量均提高至一定程度后，且DCP用量为MAH用量的10％时，产物的接枝效率最高。在体系中加入适当粘度和结构的PP，可以获得接枝率变化不大，而熔体质量流动速率明显增大的接枝物。     

ABS,PS,PP／PE共混物的声发射研究

报道了ＡＢＳ,ＰＳ,ＰＰ／ＰＥ共混物的声发射研究。探讨了热处理和温度骤变对ＡＢＳ和ＰＳ声发射的影响,考察了ＰＰ／ＰＥ不同共混比的声发射和断裂行为,并且用电镜分析了共混物的取向结构和断面形态。结果表明,声发射与材料内应力的大小关系密切,提出了可以用声发射技术来评价塑料的成型条件的观点,揭示了ＰＰ／ＰＥ共混材料单轴拉伸断裂主要是由分子链高度取向所形成的纤维断裂和滑移造成的。     

相容剂改性PE/PP共混物在滴灌带中的应用

介绍了相容剂改性PE/PP共混物在生产滴灌带中的应用情况,探讨了相容剂改性PE/PP共混体系的相容性机理,通过大量的实验找到了最佳配比方案。结果表明:以相容剂改性PE/PP共混物生产的滴灌带与普通滴灌带配方对比界面黏结性强,不分层剥离。改善和提高了PE/PP的相容性和产品力学性能。     

COP/PP共混物的流变性能

采用 CFT-5 0 0型毛细管流变仪研究了含 COP(含 -SO3N a的共聚酯 ) / PP共混物的流变性能。结果表明 :COP/ PP共混物为假塑性流动 ,其偏离牛顿流动行为的程度与共混物构成有关。在 2 65℃和 2 80℃时 ,COP/ PP共混物的表观粘度随 COP含量的增加而减小 ;COP含量增加 ,共混物的粘温依赖性增大。     

剪切速率对PA 6/PP共混物微观结构的影响

以马来酸酐（MAH）、苯乙烯（St）多单体熔融接枝聚丙烯（PP）[PP—g-（MAH-co—St）]为增容剂改性聚酰胺（PA）6／PP体系,制备了PA6／PP合金,研究了合金的流变性能。结果表明,PP—g-（MAH—co—St）增容的PA 6/PP共混物熔体属假塑性流体,熔体黏度随PP-g-（MAH—co—St）含量的增加逐渐增大。在较低剪切速率（99．90s^-1）下,体系分散相PP的粒径尺寸较小：剪切速率从99．90s^-1到706．50s^-1,分散相粒径增加：剪切速率从706．50s^-1增到5002．65s^-1,分散相粒径又相对减小。     

抗氧剂对PP/EPDM共混物性能和微观结构的影响

采用熔融共混法制备了聚丙烯/三元乙丙橡胶(PP/EPDM)共混物,利用力学性能测试、SEM和TG分析等手段考察了抗氧剂对共混物热氧稳定性、光稳定性、力学性能和微观结构的影响。结果表明:抗氧剂1010和抗氧剂168的加入,提高了PP/EPDM共混物的耐候性,细化了分散相的尺寸,改善了共混物的力学性能。     

改善软管用废旧PE／PP共混物相容性的研究

生产软管的主要材料为PE和PP。PE具有良好的力学性能和较高的使用温度,加工温度范围比较宽,抗老化性能比较好;而PP具有良好的抗疲劳性能和较低的密度（O．830-0．915g／cm3）,且价格低廉、纤维强度高、耐磨和耐热,因此采用PE和PP树脂共混生产的软管具有强度高、质轻及成本低的优势。特别是在共混体系中掺入来自废旧塑料的PE、PP树脂,     

一种抗菌、耐紫外光照的PP/PE管材及其制备方法

本文通过用过氧化二异丙苯引发马来酸酐熔融接枝PP/PE的共混物,同时采用辐照法接枝抗菌剂,添加负载抗菌的二氧化钛和炭黑作为紫外吸收剂,添加聚烯烃弹性体,添加灰色或绿色的色母粒,增加PP/PE管材的不透光性,改善管材的抗冲击性能和低温脆性,得到性能优良的PP/PE复合材料,实现了一种适于高耐寒地区使用的高性能塑料管材的开发。     

增塑剂DOP对NBR/PP共混物性能的影响

研究增塑剂DOP对NBR／PP共混物物理性能、结晶性能及流变特性的影响。结果表明，随着增塑剂DOP用量增大，NBR／PP共混物的硬度明显降低，流动性能显著提高；增塑剂DOP用量对共混物的结晶性能影响不大；加入增塑剂DOP，共混物老化后的100％定伸应力和拉伸强度提高，拉断伸长率和流动性能下降。     

贮存稳定的SBS/PE共混物改性沥青

研究了用SBS／PE熔融共混物改性的沥青和直接添加SBS及PE所得改性沥青的高温贮存稳定性,结果表明,前者的高温贮存稳定性明显优于后者,可能是由于熔融共混过程中生成了SBS－g-PE,改善了SBS与PE的相容性,从而提高了改性沥青的高温贮存稳定性。     

PA6/PE基体-微纤型纤维溶解抽出过程的研究

对浸胶的 PA6/PE(60 /4 0 )共混纤维无纺布试样用二甲苯进行溶解抽出 ,计算其 PE的溶出率(抽出率 ) ,探索渗透剂氨基硅烷对溶解过程的影响。结果表明 :溶解抽出的温度高于 70℃ ,并且温度越高 ,溶解时间越长 ,PE的抽出率越大 ,最佳溶解温度为 85～ 90℃ ,溶解时间为 60～ 90 min;溶解过程中在二甲苯中加入适量浓度的氨基硅烷对 PE的溶解抽出有一定的促进作用 ,还可以使无纺布更加柔软 ,手感更好。     

聚丙烯/分子筛共混纤维的结构与性能

用钛酸酯偶联剂对分子筛进行表面处理,按一定比例与聚丙烯(PP)切片共混纺丝,制得PP/分子筛共混纤维,研究PP/分子筛共混纤维的结构与性能。结果表明:当纤维中分子筛的质量分数为1%时,PP/分子筛共混纺丝纤维的可纺性好,断裂强度比纯PP纤维提高31.85%,上染率提高44.86%,初始模量、断裂功、回潮率均有所提高;与纯PP纤维相比,PP/分子筛共混纤维的结晶度略小、晶粒变大,取向度降低,纤维的染色性、吸湿性得到改善。分子筛与偶联剂发生化学反应,有利于分子筛和PP的结合,适当的分子筛含量时,纤维的力学性能有所提高。     

Morphological,thermal, and mechanical properties of polypropylene/polycarbonate blend

This work deals with the effect of compatibilizer on the morphological, thermal, rheological, and mechanical properties of polypropylene/polycarbonate (PP/ PC) blends. The blends, containing between 0 to 30 vol % of polycarbonate and a compatibilizer, were prepared by means of a twin-screw extruder. The compatibilizer was produced by grafting glycidyl methacrylate (GMA) onto polypropylene in the molten state. Blend morphologies were controlled by adding PP-g-GMA as compatibilizer during melt processing, thus changing dispersion and interfacial adhesion of the polycarbonate phase. With PP-g-GMA, volume fractions increased from 2.5 to 20, and much finer dispersions of discrete polycarbonate phase with average domain sizes decreased from 35 to 3 μm were obtained. The WAXD spectra showed that the crystal structure of neat PP was different from that in blends. The DSC results suggested that the degree of crystallization of PP in blends decreased as PC content and compatibilizer increased. The mechanical properties significantly changed after addition of PP-g-GMA. © 1997 John Wiley & Sons, Inc. J Appl Polym Sci 63: 1857–1863, 1997     

Study on processing of ultrahigh molecular weight polyethylene/polypropylene blends

The processing of ultrahigh molecular weight polyethylene (UHMWPE) by the addition of polypropylene (PP) and high‐density polyethylene (HDPE) was investigated. The results show that the addition of PP improves the processability of UHMWPE more effectively than does the addition of HDPE. UHMWPE/PP blends can be effectively processed with a twin‐roller and general single‐screw extruder. In the extrusion of UHMWPE/PP blends, PP is enriched at the surface of the blend adjacent to the barrel wall, thus increasing the frictional force on the wall; the conveyance of the solid down to the channel can then be carried out. The melt pool against the active flight flank exerts a considerable pressure on the UHMWPE powder in the passive flight flank, which overcomes the hard compaction of UHMWPE. The PP penetrates into the gaps between the particles, acting as a heat‐transfer agent and adhesive, thus enhancing the heat‐transfer ability in the material. © 2004 Wiley Periodicals, Inc. J Appl Polym Sci 94: 977–985, 2004     

Effect of recycled polypropylene on polypropylene/high‐density polyethylene blends

The effect of recycled PP on incompatible blends of virgin polypropylene (PP) and high‐density polyethylene (HDPE) was studied. Recycled PP from urban solid waste was extracted with methyl ethyl ketone and the compatibilizing action of the product before and after extraction was examined. The characterization of the recycled PP was performed by FTIR, NMR, and DSC analyses. Mechanical properties of the blends were evaluated. The results showed partial compatibility of the blend components, reflected in the improvement of the tensile strength and elongation. Best results were achieved by the addition of extracted recycled PP on the 50/50 PP/HDPE blends. © 2001 John Wiley & Sons, Inc. J Appl Polym Sci 80: 1305–1311, 2001     

羊毛粉/PP共混纺丝和复合纺丝纤维的研究

采用高压空气粉碎羊毛制得的羊毛粉,与聚丙烯(PP)熔融共混纺丝和皮芯型复合纺丝,分别制得羊毛粉/PP共混纤维和复合纤维。对比分析了羊毛粉/PP共混纤维、复合纤维及纯PP纤维的结构和性能。结果表明:羊毛粉/PP共混纤维的断裂强度、初始模量高于复合纤维及纯PP纤维,其大小顺序依次为共混纤维、纯PP纤维、复合纤维;羊毛粉/PP共混纤维的表面染色深度(K/S值)高于复合纤维及PP纤维,其大小顺序依次为共混纤维、复合纤维、纯PP纤维;羊毛粉/PP共混纤维和复合纤维的回潮率均高于纯PP纤维,其大小顺序依次为复合纤维、共混纤维、纯PP纤维。     

聚丙烯/含锌聚醚酯酰胺共混纤维的结构与性能

以氧化锌、己二酸、聚己二醇、己内酰胺和二苯甲烷二异氰酸酯(MDI)为原料制备含锌聚醚酯酰胺(M-PEEAM)。将聚丙烯(PP)与M-PEEAM共混制备PP/M-PEEAM共混物及其纤维,研究了PP/M-PEEAM共混物的热性质,考察了PP/M-PEEAM共混纤维的结构与力学性能。结果表明:PP/M-PEEAM共混物在166～167℃附近有大的吸热峰,在50℃和218℃附近有2个小吸热峰,多峰效应表明PP和M-PEEAM为不相容体系,M-PEEAM含量对PP/M-PEEAM共混物熔点影响不大;PP/M-PEEAM共混物具有两相结构,M-PEEAM呈球形分布在PP基体之中,M-PEEAM含量增加,球的直径增大,长度增加。PP/M-PEEAM共混纤维的断裂强度随着M-PEEAM含量增加而减小。     

PP/共聚酯共混纤维染色热力学研究

采用聚丙烯(PP)与常压阳离子染料可染共聚酯共混纺丝,共混纤维在不同温度(100,117℃)和不 同的阳离子蓝X-GRRL染料浓度中染色至饱和,研究了共混纤维各种染色热力学参数。共混纤维在该染料 染浴中100℃时的染色标准亲和力为-7.94 kJ／mol,100～117℃的染色热为4.21kJ／mol,100℃时的染色熵 为-10.0J／(mol·K)。     

Crystallization behavior of polypropylene in polypropylene/nylon 6 blend

This article describes the crystallization behavior of polypropylene (PP) in the presence of a crystallizable polymer, namely, nylon 6, in the binary blend of PP/nylon 6 in the composition range from 0 to 30 wt % of nylon 6 content in the blend. The crystallization behavior was studied through variation of the crystallinity with the blend composition and changes in the crystallization exotherms were recorded by differential scanning calorimetry (DSC) and the spherulite morphology was observed via polarized light microscopy (PLM). Comparison of the crystallization exotherms and melting endotherms revealed some differences which are attributed to the role of a sufficiently high thermal energy of the nylon 6 crystals on the melting of PP. The crystallinity of PP decreased in the presence of nylon 6, whereas the crystallinity of nylon 6 increased considerably in the presence of PP. The rate of nucleation of PP on addition of nylon 6 decreased rapidly in the region 0–10 wt % nylon 6 content, and, thereafter, at a higher nylon 6 content, decrease of the nucleation rate was relatively slow. PLM observation revealed the presence of composite spherulites with PP spherulites grown on the surface of the already‐formed nylon 6 spherulites. © 1999 John Wiley & Sons, Inc. J Appl Polym Sci 71: 1153–1161, 1999     

动态硫化法制备SBR/PP共混物的研究

采用动态硫化技术,在双辊开炼机上制备ＳＢＲ／ＰＰ共混物,并研究不同硫化体系、共混比、混炼时间、炭黑用量、环烷油用量和流动助剂用量对共混物力学性能的影响。结果表明：选用低结晶度且熔融指数小的ＰＰ与ＳＢＲ共混,采用半有效硫化体系,橡塑比为７０／３０￣６０／４０,共混时间为９ｍｉｎ时,共混物综合力学性能较好。通过正交试验得出：炭黑用量增大,共混物的拉伸强度、硬度增大而扯断伸长率降低;环烷油、流动助剂用量