PC/ABS共混物的流变性能

采用熔融共混的方法,制备了不同配比的聚碳酸酯(PC)/丙烯腈-丁二烯-苯乙烯(ABS)共混物。采用毛细管流变仪研究了PC/ABS共混物的流变行为。结果表明:PC/ABS共混物熔体的流变行为呈假塑性流体的特征,表观黏度随剪切速率的增加而减小,随温度的升高而降低,随ABS含量的增加而减小;随着ABS含量的增加,共混物表观黏度对温度的敏感性降低,对剪切速率的敏感性增加;加入相容剂使PC/ABS共混物更易加工成型。     

丙烯酸漆对PC/ABS共混物性能和微观结构的影响

采用熔融共混法制备了聚碳酸酯/丙烯腈-丁二烯-苯乙烯共聚物(PC/ABS)的共混物,利用力学性能测试和SEM分析手段考察了丙烯酸油漆对共混物力学性能和微观结构的影响。结果表明:随着浸泡时间、干燥温度和干燥时间的增加,PC/ABS共混物的力学性能都随之下降;另外,随着ABS和相容剂含量的增加,PC/ABS共混物抗溶蚀能力均逐渐提高,其中ABS含量达到50%时,共混物力学性能保持率最佳。     

汽车用ABS/PC共混物改性研究进展

综述了近年来汽车用丙烯腈-丁二烯-苯乙烯共聚物/聚碳酸酯(ABS/PC)共混物改性的研究进展,通过对ABS/PC共混物的改性,提高了ABS/PC共混物的阻燃性、导电性及力学性能。分析讨论了汽车对各种改性材料的需求,并对汽车用ANN/PC共混物改性的发展方向做出了展望。     

相容剂对PC/ABS共混物性能的影响

本文分别研究了马来酸酐接枝ABS(ABS-g-MAH)与甲基丙烯酸甲酯/丁二烯/苯乙烯共聚物(MBS)作为相容剂对PC/ABS共混体系相容性、力学性能、形态结构的影响.研究结果表明:当相容剂MBS加入PC/ABS共混体系中后,不仅能够显著改善PC/ABS共混物的相容性,明显降低分散相的粒径,而且能够使PC/ABS共混物在保持较高的拉伸强度的同时,大幅度地提高共混物的缺口冲击强度和断裂伸长率;而相容剂ABS-g-MAH的加入对共混体系的缺口冲击强度的改善不明显,但其断裂伸长率增幅较大.     

PC／ABS共混物的结构和性能

综合分析了有关PC/ABS共混物的文献,重点介绍了PC/ABS共混物的结构,力学性能和热性能,以及改进性能的途径。同时介绍了共混的可能性、共混方法和成型加工要点等。     

ACR对PC和PC/ABS合金的增韧研究

以丙烯酸酯类树脂(ACR)FM50和D320作为增韧剂对聚碳酸酯(PC)和PC/丙烯晴-丁二烯-苯乙烯(ABS)(60/40,质量比)合金进行增韧。研究了ACR对PC和PC/ABS合金力学性能和熔体流动性的影响。结果表明,随ACR质量分数的增加,PC/ACR共混物的冲击强度增加,熔体质量流动速率先增大后减小,PC/ABS/ACR共混物的冲击强度先增加后降低,熔体质量流动速率减小,ACRFM50对PC和PC/ABS合金的增韧效果优于ACRD320,共混物的拉伸强度和弯曲强度随ACR用量的增加而下降。     

膨化石墨填充PC/ABS共混物的性能研究

以膨化石墨(EG)作为导电填充物,加入相容剂,采用熔融共混方法制备了聚碳酸酯(PC)/丙烯晴–丁二烯–苯乙烯塑料(ABS)共混物,研究了EG以及破碎后的膨化石墨(TEG)的添加量对PC/ABS共混物的形貌、电阻率、拉伸强度、缺口冲击强度以及热稳定性的影响。结果表明,EG经过研磨、超声破碎后颗粒更小,在基体中分布得更均匀,与基体的相容性更好。TEG对PC/ABS共混物的导电能力、拉伸强度、冲击强度的提升更加明显,添加了TEG的PC/ABS共混物的热稳定性得到了较大提升。     

ABS增韧PC/CF共混体系加工流变与力学性能

利用微量双螺杆挤出机，通过熔融共混挤出注塑的方法，在PC/CF共混体系中添加ABS对其进行增韧改性，实验对共混体系加工过程中的流变行为进行了分析，分别研究了碳纤维及ABS的含量对复合材料力学性能的影响，并探讨了黏度与力学性能变化的机理，最后通过扫描电子显微镜观测拉伸及冲击破坏的试样断面形态。结果表明，当CF含量为2%时，PC/CF复合材料假塑性最强，熔融状态下易于流动加工，力学性能也最为优异；CF含量不变，当ABS含量为30% ~ 35%时，PC/CF/ABS三元共混物同时具有良好的流动性及力学性能。扫描电镜照片显示，拉伸破坏的主要破坏方式为界面脱胶，而冲击破坏的主要破坏方式为纤维断裂；PC/CF/ABS三元共混物试样断裂面韧性断裂成份要明显多于PC/CF二元共混物，表明复合材料的力学性能得到了改善。     

国外动态

新型车用内饰件PC/ABS共混物合金Styron汽车公司推出了两种新型特级的PC/ABS共混物合金。据称,新品同已有可竞争的产品比较,具有更好的流动性能以及更优惠的成本效益。其中,牌号为Pulse GX70的PC/ABS合金产品在成本效益上近似于公司2011年推出的GX50品级。新品树脂不仅可以满足汽车内饰件具有较高的耐热性能,同时还具     

PC/ABS共混物的仪表冲击试验研究

介绍系列PC／ABS共混物的仪表冲击试验。结果表明，不同温度和不同缺口形式下PC/ABS共混物冲击断裂过程中的裂纹萌生功和扩展功随共混物组成的变化趋势基本一致，但萌生功的变化比扩展功的变化更趋平缓；裂纹萌生功在冲击功中所占比例受温度影响较大，较高温度(19℃)下萌生功所占比例比较低温度(2℃)下小；不同温度下所到得的系列PC/ABS共混物的临界裂纹扩展力GIC值随共混物组成变化均有一极大值，但不同温度下GIC值的极大值点所对应的共混比不同。     

Influence of rubber content in ABS in wide range on the mechanical properties and morphology of PC/ABS blends with different composition

A series of acrylonitrile–butadiene–styrene (ABS) with different rubber content were prepared by diluting ABS grafting copolymer containing 60% rubber with a styrene–acrylonitrile copolymer. ABS prepared were blended with bisphenol‐A‐polycarbonate (PC) at the ratio of 70/30, 50/50, and 30/70 to prepare PC/ABS blends. Influence of rubber content in ABS on the properties of ABS and PC/ABS blends were investigated. PC/ABS blends with different compositions got good toughness when the rubber in ABS increased to the level that ABS itself got good toughness. The tensile properties and processability of PC/ABS blends decreased with the increase of the total rubber content introduced into the blends. ABS with the rubber content of 30 wt% is most suitable to be used to prepare PC/ABS blends. The rubber content in ABS affected the viscosity of ABS, and subsequently the viscosity ratio of PC to ABS. As a result, the morphology of PC/ABS blends varied. The increase of rubber content in ABS results in finer structure of PC/ABS blends. POLYM. ENG. SCI. 46:1476–1484, 2006. © 2006 Society of Plastics Engineers.     

Effects of blend composition on the morphologies and physical properties of polycarbonate/acrylonitrile-butadiene-styrene blends

The morphologies and physical properties of twin-screw-extruded polycarbonate/acrylonitrile-butadiene-styrene (PC/ABS) blends with various blend ratios are studied. The needle-like co-continuous phase in PC-rich blends changes to the sea-island phase for blend ratios of more than 50 wt% ABS. While pure PC exhibits an almost-Newtonian flow behavior, PC/ABS blends exhibit the interesting rheological transition. The viscosities of the ABS-rich blends at low shear rates are almost equal to those of the pure ABS polymer. The yield stress for the PC/ABS blend ratio of 3:7 is the highest in composition. At the frequency of 10 rad/s, the PC-rich blends exhibit highly viscous properties, whereas the ABS-rich blends present highly elastic properties as the temperature increases. Moreover, the ABS polymer in the PC/ABS polymer blend induces significant change at the fracture surface of PC, transitioning from brittle to ductile nature.     

抗静电PC/ABS合金材料的研究

研究了聚碳酸酯（ＰＣ）与ＡＢＳ共混体系的抗静电性能及其影响因素。结果表明：二价的烷基苯磺酰盐是ＰＣ／ＡＢＳ合金材料较好的抗静电剂,可降低材料的表面电阻率和体积电阻率;在一定范围内,抗静电剂用量越多,抗静电效果越好;用马来酸酐接枝聚乙烯作增容剂能提高ＰＣ／ＡＢＳ合金的抗静电性能;学能改善共混物的相容性,从而提高合金材料的冲击强度。     

聚环氧酯的合成及其对PC/ABS相容性的影响

以双酚A环氧树脂和己二酸合成了聚己二酸环氧酯,将环氧酯作为相容剂加入到PC/ABS中通过双螺杆挤出机并注射成型制备了合金,与马来酸酐接枝聚苯乙烯（SMA）相容剂增容的合金的力学性能及分散形态进行了对比。结果表明,聚环氧酯对PC相具有良好的相容性,而SMA对ABS相的相容性较好,二者复合使用可以显著改善合金的相容性;聚环氧酯能明显提高PC/ABS合金的拉伸强度和缺口冲击强度,但过量加入会降低合金的冲击强度;SEM结果表明少量的聚环氧酯即可以使ABS分散相分布均匀,与SMA并用可以使分散相尺寸减小,提高相容性。     

新一代高性能PC/ABS合金的研究

通过对聚碳酸酯(PC)/(丙烯腈/丁二烯/笨乙烯)共聚物(ABS)合金失效原因分析,对材料的各组分选材进行优化,研究了PC/ABS合金经多次循环回收、高温高湿加速老化、长期高温热老化后的性能变化情况.配方优化后的PC/ABS材料既可成型薄壁大型制件,又具有优良的耐久性,且可以回收利用.     

PC/ABS回收料的改性研究

采用双螺杆熔融挤出的方法将不同含量相容剂(马来酸酐接枝苯乙烯-丁二烯共聚物,BS-g-MAH)、ABS高胶粉(g-ABS)分别与PC/ABS回收料融熔共混,并对共混材料进行了力学性能表征,结果表明:添加2%相容剂能有效改善PC与ABS的相容性,提高ABS回收料的拉伸强度,但对材料的冲击强度作用不大;随着ABS高胶粉含量的增加,回收料的悬臂梁缺口冲击强度逐渐上升,拉伸强度及断裂伸长率则先上升后下降,当添加15%ABS高胶粉时,回收料的综合性能最佳。     

ABS/PC共混合金组成与性能的研究

选用两种不同牌号的ABS树脂与PC共混,并对其组成与性能的关系进行了系统的研究。结果表明,ABS的组成不同,ABS PC混合物的相容性、力学性能以及流变行为都不相同。     

Effect of polycarbonate molecular weight on polymer blends of polycarbonate and ABS

The melt viscosity of polycarbonate/acrylonitrile-butadiene-styrene (PC/ABS) blends relative to PC is significantly lower, even lower than that of pure ABS in some compositions. Annealing above the T_g of PC coalesces and coarsens phase structure in core and skin regions. Increase in the molecular weight of PC in PC/ABS blends results in low-temperature fracture toughness improvement but suffers from the disadvantage of higher melt viscosity. The selection of PC in PC/ABS blends must be a compromise between the toughness advantages of higher PC molecular weight and the disadvantage of higher melt viscosity. © 1993 John Wiley & Sons, Inc.     

Mechanical properties of blends of polycarbonate with unmodified and maleic anhydride grafted ABS

Blends of polycarbonate/acrylonitrile–butadiene–styrene terpolymer (PC/ABS) and polycarbonate/maleic anhydride grafted ABS (PC/MABS) were prepared over the whole range of compositions using a single-screw extruder. Tensile, flexural, notched Izod impact properties, and the heat deflection temperature of these blends were determined. Mechanical properties of PC/MABS blends are nearly equal to or higher than, those predicted by the rule of mixtures, whilst those of PC/ABS blends show nearly equal, or negative deviation, from the rule of mixtures. The notched impact strength of PC/MABS blends shows a positive blending effect and proportionate increase from 25wt% PC to 75wt% PC. Scanning electron micrographs were taken of etched surfaces of selective blends. © 1998 SCI.     

Interactive effect of ammonium polyphosphate and montmorillonite on enhancing flame retardancy of polycarbonate/acrylonitrile butadiene styrene composites

The effect of two flame retardants [ammonium polyphosphate (APP) and montmorillonite (MMT)] was studied in relation to flame retardancy, mechanical properties and physical characteristics of polycarbonate (PC)/acrylonitrile butadiene styrene (ABS) blends. Moreover, the possible synergistic effect of these two flame retardant additives on the macromolecular blends was studied as well. Based on this research, it was revealed that APP- and MMT-raised loading has significantly increased the limiting oxygen index (LOI) of the resulting PC/ABS blends, which is due to the intumescence effect provoked by the incorporation of these flame retardant fillers. Incorporation of APP improved the LOI through intumescence effect while the addition of MMT led to intercalation of PC/ABS polymer matrix into the interlayer galleries of MMT particles. Besides, higher APP loading in PC/ABS blends has significantly promoted the formation of carbonaceous char residues as evidenced in TGA analysis, which indicates that addition of higher APP could improve thermal stability of PC/ABS blends. To improve the tensile strength and elongation-at-break, APP loading of 25 phr in PC/ABS blends together with various MMT loading would be suitable to ensure good dispersion and interfacial adhesion between the polymer chains and the additives. However, it is important to control the loading level of MMT as its excessive incorporation could result in flame-retarded PC/ABS blends with brittle behavior, showing weaker mechanical properties.