PP-g-MAZn离聚物增容PP/PA6的流变性能

采用双料筒毛细管流变仪研究了聚丙烯接枝马来酸锌(PP-g-MAZn)离聚物增容的聚丙烯(PP)/尼龙6(PA6)的流变性能。结果表明,PP-g-MAZn增容的PP/PA6为假塑性流体,其表观粘度随着剪切速率的增加而降低;与未增容的共混体系相比,PP-g-MAZn增容的PP/PA6的表观粘度增大,并随PP-g-MAZn含量的增加而升高。PP-g-MAZn增容的PP/PA6的粘流活化能随着剪切速率的增大而降低。与未增容PP/PA6相比,PP-g-MAZn增容的PP/PA6有效地推迟了不稳定流动现象。     

PP/EPDM-g-MAH/TPU共混物流变行为的研究

以EPDM g MAH为增容剂 ,采用熔融共混技术制备了热塑性聚氨酯弹性体 (TPU)增韧聚丙烯 (PP)材料 ,研究了PP/EPDM g MAH/TPU共混物的流变行为 ,重点讨论了增容剂EPDM g MAH对共混物流变行为的影响。结果表明 :共混物熔体的非牛顿指数n <1,且随EPDM g MAH用量的增加而减小 ,表观粘度随剪切速率和剪切应力的增大而降低 ,熔体符合假塑性流体的流动规律 ;温度升高 ,表观粘度降低 ;随着EPDM g MAH用量的增加 ,共混物的表观粘度升高 ,粘流活化能有所减小     

PP/PET共混熔体的流变性能研究

以PP-g-AA作增容剂,研究了PP/PET共混熔体的流变行为。讨论了温度、剪切速率以及PET和增容剂含量对熔体表观粘度、非牛顿指数等方面的影响。结果表明,PP/PET共混物熔体表观粘度随剪切速率的增大而降低,随PET及增容剂含量的增加而下降,随温度的升高而下降。PET和增容剂的加入,在共混熔体中起到了增塑剂的作用。     

马来酸酐接枝物对PE/PA6共混物相容性的影响

采用熔融共混法制备了PP/PA6/POE-g-MAH和PP/PA6/PP-g-MAH共混物。通过扫描电子显微镜(SEM)、差示扫描量热(DSC)仪分析和力学性能测试研究了增容剂POE-g-MAH和PP-g-MAH对PP/PA6共混物相容性、形态结构和宏观力学性能的影响。结果表明,在PP/PA6共混体系中分别加入POE-g-MAH和PP-g-MAH不仅能显著改善两相界面的相容性,减小分散相的粒径,而且能使共混物的力学性能显著提高。当增容剂的用量为5份时,PP/PA6共混物有较好的综合力学性能。POE-g-MAH和PP-g-MAH增容PP/PA6共混体系非等温结晶行为的研究表明,POE-g-MAH和PP-g-MAH均能促进PA6对PP基体的异相成核作用。     

PP-g-MAH增容PP/PA 6的形态结构与流变性能

研究了用马来酸酐接枝聚丙烯（PP-g-MAH)来增容聚丙烯/聚酰胺6（PP/PA6）共混物的形态结构，探讨了PP-g-MAH增容PP/P6共混物的流动行为。结果表明，PP/PA6共混物为热力学不相容的海岛型两相结构，PP-g-MAH的加入改善了PA6与P宾相容性，使两相分散均匀。用PP-g-MAH为增容剂增容PP/PA6共混物，在加工成型温度下为非牛顿流体，在PP-g-MAH质量分数为10%，PP/PA6的配比为95：5-75：25，其流动行为可用T=1580γw^0.65模型描述。     

HDPE/HDPE-g-MAH/PA11共混物流变行为的研究

以马来酸酐接枝高密度聚乙烯(HDPE-g-MAH)为增容剂,通过熔融共混法制备了HDPE/HDPE-g-MAH/聚酰胺11(PA11)共混物,讨论了增容剂HDPE-g-MAH对共混物流变行为的影响。结果表明:HDPE-g-MAH的加入使共混物熔体对剪切速率的敏感性增强,同时使共混物黏度对温度变化的敏感程度减弱;随着HDPE-g-MAH含量的增加,共混物表观黏度先增加后减小,其含量为2%时共混物黏度最大。     

PP/PA6复合材料增容改性研究进展

聚丙烯和尼龙6(PP/PA6)共混物是热力学不相容体系,其研究和开发的关键是增容技术和机理。本文综述了近年来PP/PA6复合材料增容改性的研究进展,重点介绍了PP的官能化,马来酸酐型、羧基,羟基型、甲基丙烯酸缩水甘油酯型等增容剂以及多单体熔融接枝物在PP/PA6复合材料增容改性中的应用,并对PP/PA6增容改性发展趋势作了展望。     

多单体接枝聚丙烯对PP/PA6共混物形态及力学性能的影响

用同向双螺杆挤出机制备了马来酸酐(MAH)、苯乙烯(St)多单体熔融接枝聚丙烯[PP-g-(St-MAH)],将其作为增容剂在Haake转矩流变仪上与PP/PA6共混得到PP/PA6/PP-g-(St-MAH)共混物,并对共混物的性能及结构进行了表征。结果表明,该增容剂明显改善了共混物的力学性能,当增容剂含量为15~20份时,共混物的冲击强度和拉伸屈服强度达最大值。采用扫描电子显微镜观察共混物试样断面的形态,发现分散相的粒径明显减小,且分散均匀。     

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。     

PP-g-MAH对PP/PA6共混物的增容作用

采用熔融接枝法,考察了单体和引发剂用量对聚丙烯(PP)/马来酸酐(MAH)接枝物接枝率的影响。将PP-g-MAH作为PP/尼龙6(PA6)共混物的增容剂,并利用SEM、XRD、DSC-TGA和万能试验机等测试手段对PP-g-MAH增容改性PP/PA6共混体系进行了研究。结果表明,PP-g-MAH接枝物对PP/PA6共混物具有良好的增容效果,PP结晶得到细化,共混物的力学性能和耐高温性能得到改善。     

PP-g-GMA的制备及其增容PP/PA6共混物的性能

通过熔融接枝反应制备了甲基丙烯酸缩水甘油酯接枝聚丙烯（PP-g-GMA）,并将其作为聚丙烯/聚酰胺6（PP/PA6）共混物的相容剂,研究了PP-g-GMA对PP/PA6共混物的力学性能及形态结构的影响。结果表明,采用滴定法测得PP-g-GMA接枝率为3.35 %;当PP-g-GMA的添加量为4 %（质量分数,下同）和8 %时,PP/PA6/PP-g-GMA共混物的拉伸强度和缺口冲击强度分别较PP/PA6共混物提高了32.4 %和60.4 %;PP-g-GMA显著改善了PP/PA6 共混物的界面相容性,是PP/PA6共混物的有效增容剂。     

Morphological properties,rheological behaviors,and phase interaction of nylon 11/polypropylene blends by in situ reactive compatibilization and dispersion through polyhydroxybutyrate

The current research discusses the reactive compatibilization of nylon 11 (PA11) and polypropylene (PP) using maleic anhydride grafted PP (PP-g-MA) through an extruder. PP phase is dispersed in PA11 by coalescence and droplet break-up mechanism by using polyhydroxybutyrate (PHB) as a dispersion agent that induces uniform interaction between the blend components. The reactive compatibilization ensures the mixing of polymers, and the consistent interaction of phases is controlled by dispersion. All of the blends were processed through melt processing at different compositions using a twin-screw extruder. Scanning electron microscopy was used to determine the morphologies of the binary and ternary blends. Surface tension and interfacial tension of the homopolymer characterizes the interaction of the polymers at interphase. The interaction of PHB/PA11 appeared preferable than that of PHB/PP, elaborating on the efficient dispersion and droplet formation of the PP phase. The compatibilizer maleic anhydride grafted PP (PP-g-MA) imparts a drastic effect on the compatibility of PA11-PP and PA11-PHB-PP blends and reduces PP phase particle size, which indicates the affinity of PHB and PP. The encapsulation of PP by PHB was seen in the expectation of minimum free energy models. The rheological measurements were used to understand the phase separation within blends. These measurements were also applied to understand the interaction between PA11-PP-PHB phases. The modulus values and viscosity ratio of the blends were measured to follow the chain relaxation in the melt. In the Cole–Cole plot, it was found that the reduction in PP phase size influences the relaxation of chains of blends.     

E-MA-GMA增容剂对PPS/PA66共混体系性能的影响

研究了增容剂乙烯(E)-丙烯酸酯(MA)-甲基丙烯酸缩水甘油酯(GMA)共聚物(E-MA-GMA)对聚苯硫醚(PPS)/聚酰胺(PA)66共混体系的相容性、力学性能、热性能、流变性能的影响。结果表明,增容剂的加入,增加了共混体系的相容性,提高了共混物的力学性能;DSC结果表明,E-MA-GMA影响共混体系的结晶和熔融行为;流变性能测试结果表明,增容PPS/PA66共混体系是假塑性流体,E-MA-GMA用量增加,使共混体系的表观黏度增大。     

PA6/PP/SEBS-g-MAH共混物的相容性研究

采用马来酸酐接枝(氢化苯乙烯/丁二烯/苯乙烯)共聚物(SEBS-g-MAH)作为增容剂,研究了增容剂用量对尼龙6/聚丙烯(PA6/PP)共混体系相态结构、力学性能的影响,以及在相同增容剂用量下不同PA6、PP配比对体系相形态的影响。结果表明,SEBS-g-MAH中的酸酐基团能与PA6末端的氨基发生化学反应,在PA6和PP的内表面形成PA6-SEBS接枝共聚物,明显改善了两相的界面相容性,并使共混物的力学性能得到显著提高。共混物冲击断面形貌的分析表明,共混物发生了明显的脆韧转变。     

Functionalized elastomeric compatibilizer in PA 6/PP blends and binary interactions between compatibilizer and polymer

Superior impact properties were obtained when maleic anhydride grafted styrene ethylene/butylene styrene block copolymer (SEBS-g-MAH) was used as a compatibilizer in blends of polyamide 6 (PA 6) and isotactic polypropylene (PP), where polyamide was the majority phase and polypropylene the minority phase. The optimum impact properties were achieved when the weight relation PA:PP was 80:20 and 10 wt% SEBS-g-MAH was added. The blend morphology was systematically investigated. Transmission electron microscopy (TEM) indicated that the compatibilizer forms a cellular structure in the PA phase in addition to acting as an interfacial agent between the two polymer phases. In this cellular-like morphology the compatibilizer appears to form the continuous phase, while polyamide and polypropylene form separate dispersions. In microscopy, PA appeared as a fine dispersion and PP as a coarse dispersion. The mechanical properties indicated that in fact PA, too, is continuous, and the blend can be interpreted as possessing a modified semi-interpenetrating network (IPN) structure with separate secondary dispersion of PP. The coarser PP dispersion plays an essential role in impact modification. Binary blends of the compatibilizer and one blend component were also investigated separately. The same cellular structure was observed in the binary PA/SEBS-g-MAH blends, and SEBS-g-MAH again appeared to form the continuous phase when the elastomer concentration was at least 10 to 20 wt%. By contrast, in PP/SEBS-g-MAH only conventional dispersion of elastomeric SEBS-g-MAH was observed up to 40 wt% elastomer. Impact strength was improved and the elastic modulus was lowered in both PA/SEBS-g-MAH and PP/SEBS-g-MAH blends when the elastomer content was increased. The changes in modulus indicate that the semi-IPN-like structure is formed in the binary PA/SEBS-g-MAH blends as well as in the ternary structure.     

相容剂和加工工艺对PA1010/PP共混体系形态和力学性能的影响

以马来酸酐（MAH）和苯乙烯（St）多单体熔融接枝聚丙烯[PP-g-(MAH-co-St）]为相容剂,制备了聚酰胺10101/聚丙烯（PA1010/PP）共混体系。用毛细管流变仪、扫描电子显微镜、力学性能测试等方法研究了和加工工艺相容剂对PA1010/PP共混体系的形态和力学性能的影响。结果表明,相容剂PP-g-(MAH-co-St)有效降低了PA1010/PP共混体系的熔体流动速率;该共混体系熔体属于假塑性流体,熔体黏度随PP-g-(MAH-co-St)含量的增加逐渐增大;随着相容剂含量的增加,PA1010/PP共混体系中分散相PP的粒径逐步减小,力学性能得到改善,PA1010/PP/PP-g-(MAH-co-St)为70/25/5和70/20/10的共混体系的拉伸强度分别比PA1010/PP (70/30)共混体系提高了55.0 %和61.9 %,冲击强度分别提高了61.0 %和129.7 %;剪切速率为706.5 s-1时出现熔体破裂现象,剪切速率为5002.65 s-1时出现严重熔体破裂。     

热致性液晶与聚丙烯原位复合材料的相容性研究

在热致液晶共聚酯（ＬＣＰ）与聚丙烯（ＰＰ）的共混体系中引入相容剂（接枝共聚物ＭＡＨ—ｇ－ＰＰ），借助热台偏光显微镜、扫描电镜、差示扫描量热仪、流变仪等方法研究了相容剂对ＰＰ／ＬＣＰ原位复合材料的微观结构和界面性能、结晶行为、流变行为以及力学性能的影响．结果表明：添加相容剂后，基体中的ＬＣＰ微纤分散更均匀，ＬＣＰ微纤长径比Ｌ／Ｄ增大．ＰＰ和ＬＣＰ两相之间有较好的粘连，促进了共混体的结晶，改善了ＰＰ／ＬＣＰ原位复合材料的力学性能．     

非弹性体增韧尼龙结构与性能

根据非弹性体增韧机理，研究了以马来酸酐接枝ＰＰ作为ＰＡ６和ＰＰ共混制备ＰＡ／ＰＰ合金的相容剂，对金结构与性能的影响。结果表明，相容剂大大改善了合金的形态结构，使合金冲击强度大幅度提高，且得到综合性能优良的ＰＡ６／ＰＰ合金。