ABS/PBT合金的形态及性能研究

采用熔融共混技术制备了丙烯腈-丁二烯-苯乙烯共聚物/聚对苯二甲酸丁二醇酯/苯乙烯-丙烯腈-甲基丙烯酸缩水甘油酯(ABS/PBT/SAG)共混物,系统地研究了SAG对ABS/PBT共混物的形态结构、冲击性能、拉伸性能、耐热性、耐油性的影响。结果表明:SAG可有效改善ABS/PBT(70/30)共混合金的相容性,随着SAG用量的增加,共混体系的相容性明显改善;随着SAG用量的增加,共混物的冲击强度逐渐提高,而拉伸强度却逐渐降低;SAG可使ABS/PBT共混合金的耐热性下降,耐油性提高。     

PBT/ABS合金增容体系的研究

研究了3种不同结构的相容剂对聚对苯二甲酸丁二醇酯/丙烯腈-丁二烯-苯乙烯三元共聚物（PBT/ABS）共混合金的力学性能和熔体流动速率的影响,并采用扫描电镜和差示扫描量热仪对PBT/ABS共混合金的相界面、相容性及结晶度进行了表征。结果表明,带有环氧官能团的相容剂KS-TD-00202能有效地提高PBT/ABS共混合金的相容性,在提高共混合金缺口冲击强度的同时,不降低拉伸强度和弯曲强度,也不影响共混合金的加工流动性,同时提高了PBT在共混合金中的结晶度。     

PBT/ABS共混物中游离SAN链段的作用研究

采用种子乳液聚合技术合成核/壳质量比为60/40的丙烯腈-丁二烯-苯乙烯(ABS)核-壳结构改性剂,将ABS改性剂与聚对苯二甲酸丁二醇酯(PBT)熔融共混,制备PBT/ABS共混物。考察了ABS改性剂中游离的苯乙烯-丙烯腈(SAN)链段对PBT/ABS性能的影响。结果表明,游离链段对共混物相容性影响不大,但能够显著降低共混物的加工黏度,并且可以提高共混物的冲击强度、弯曲强度和断裂伸长率。也就是说,ABS改性剂中游离链段的存在对共混物的性能起积极作用。     

ABS-g-GMA增韧聚对苯二甲酸丁二醇酯的研究

用甲基丙烯酸环氧丙酯（（MA）接枝的丙烯腈／丁二烯／苯乙烯（ABs）接枝共聚物（ABS-g-GMA）改善聚对苯二甲酸丁二醇酯（PBT）的缺口冲击韧性。动态力学分析、差示扫描量热分析以及流变性能测试结果表明，GMA引入到ABS中，随GMA含量的增加，PBT与ABS的玻璃化转变温度相互靠近，PBT的熔点降低，共混体系的扭矩、温度提高，这些结果表明GMA提高了PBT与ABS之间的相容性；增容反应导致ABS在PBT基体中均匀、稳定分散，有利于共混物性能的改善；交联反应导致交联聚集网状结构的生成，使共混物性能变差。冲击强度结果表明，1％（质量含量。下同）GMA含量就可以导致PBT／ABS-g-GMA共混物冲击韧性显著改善，当ABS-g-GMA1含量为30％时，共混物冲击强度高达850J／m。     

相容剂对PBT／PC共混体系性能的改进

用DSC方法测试了PBT/PC（50/50,质量份）及经过相容剂（为PS接枝橡胶）处理的共混物,研究了相容剂用量对共混体系力学性能的影响。结果表明：相容剂的加入可使共混物中PBT的特点、熔融焓、结晶温度都分别比纯PBT有所降低,熔体流动速率和热变形温度有所下降。采用相容剂提高了PBT/PC共混体系两相间的相容性,改善了PBT的冲击性能,相容剂用量为15质量份时冲击强度达到最大值。     

SEBS—g—MAH对PO／PBT共混物性能影响

利用双螺杆挤出机制备聚碳酸酯（Pc）／聚对苯二甲酸丁二醇酯（PBT）／-B来酸酐接枝氢化苯乙烯-丁二烯啕E乙烯共聚物（SEBS-g—MAH）的共混物。通过扫描电子显微镜（SEM）、平板流变仪研究了SEBS-g—MAH对PC／PBT共混物的机械性能、断面形态结构、动态力学行为的影响。结果表明：SEBS-g—MAH提高了PC／PBT共混物的相容性,随着SEBS-g—MAH用量的增加,共混物的缺口冲击强度和断裂伸长率上升,拉伸强度和弯曲强度下降。当SEBS—g-MAH质量分数为5％时共混物的综合性能最佳,同时,SEBS-g—MAH的加入,并未对PC／PBT共混物的成型加工性能产生不良影响。     

强韧化PBT/PC共混物的制备与性能

采用自制的甲基丙烯酸缩水甘油酯熔融接枝丙烯腈丁二烯苯乙烯三元聚合物\[ABS-g-(GMA-co-St),AGS]为改性剂,对聚对苯二甲酸丁二醇酯（PBT）/聚碳酸酯(PC)（80/20）共混物进行改性研究。通过扫描电子显微镜、差示扫描量热仪、力学性能和流变性能测试研究了改性后共混物的性能。结果表明,随着AGS含量的增加,共混物中两相间的界面黏结增强; AGS对PBT/PC共混物具有强韧化的作用,与未添加AGS的PBT/PC共混物相比,当AGS含量为10份时,共混物的缺口冲击强度和拉伸强度分别提高了49.8 %和17.4 %;AGS的加入提高了共混物的界面强度和相容性;添加AGS能够提高共混物的结晶峰温度,起到促进晶粒生长的作用。     

LLDPE-g-PGMA对PBT/LLDPE共混物的增容作用

用线性低密度聚乙烯接枝甲基丙烯酸缩水甘油酯（LLDPE－g-PGMA，简称LG）作为反应型增容剂，来改善聚对苯二甲酸本二酯（PBT）与LLDPE共混物的相容性，考察了LG的加入对PBT端羧基含量的影响，以及LG的加入量对不同配比共混体系力学性能的影响，并用扫描显微镜（SEM）对共混物形态结构进行了表征。研究结果表明，LG的加入降低了共混物中PBT的端羧基含量，改善了共混物中两相的相容性，使共混物的冲击强度提高58％以上。     

玻璃纤维增强PBT/PET共混物性能研究

采用双螺杆熔融挤出的方法制备玻璃纤维增强聚对苯二甲酸丁二酯(PBT)/聚对苯二甲酸乙二酯(PET)共混物。研究了PBT与PET不同比例对PBT/PET共混物性能的影响。在此基础上,研究了成核剂及不同种类的增韧剂对共混物性能的影响。结果表明,成核剂对提高共混物的相容性及热变形温度有重要作用,乙烯–甲基丙烯酸甲酯–丙烯酸缩水甘油酯三元共聚物型增韧剂(AX8900)质量分数为0.5%时,不影响共混物的耐热性及拉伸和弯曲强度,而且可以大大提高PBT/PET共混物的冲击强度。     

SEBS-g-MAH对PC/PBT共混物性能影响

利用双螺杆挤出机制备聚碳酸酯(PC)/聚对苯二甲酸丁二醇酯(PBT)/马来酸酐接枝氢化苯乙烯-丁二烯-苯乙烯共聚物(SEBS-g-MAH)的共混物.通过扫描电子显微镜(SEM)、平板流变仪研究了SEBS-g-MAH对PC/PBT共混物的机械性能、断面形态结构、动态力学行为的影响.结果表明:SEBS-g-MAH提高了PC/PBT共混物的相容性,随着SEBS-g-MAH用量的增加,共混物的缺口冲击强度和断裂伸长率上升,拉伸强度和弯曲强度下降.当SEBS-g-MAH质量分数为5%时共混物的综合性能最佳,同时,SEBS-g-MAH的加入.并未对PC/PBT共混物的成型加工性能产生不良影响.     

Structure–properties relationship in toughening of poly(butylene terephthalate) with core–shell modifier

The performance of acrylonitrile–butadiene–styrene (ABS) core–shell modifier with different grafting degree, acrylonitrile (AN) content, and core–shell ratio in toughening of poly(butylene terephthalate) (PBT) matrix was investigated. Results show PBT/ABS blends fracture in ductile mode when the grafting degree is high, and with the decrease of grafting degree PBT/ABS blends fracture in a brittle way. The surface of rubber particles cannot be covered perfectly for ABS with low grafting degree and agglomeration will take place; on the other hand, the entanglement density between SAN and PBT matrix decreases because of the low grafting degree, inducing poor interfacial adhesion. The compatibility between PBT and ABS results from the strong interaction between PBT and SAN copolymer and the interaction is influenced by AN content. Results show ABS cannot disperse in PBT matrix uniformly when AN content is zero and PBT/ABS fractures in a brittle way. With the addition of AN in ABS, PBT/ABS blends fracture in ductile mode. The core–shell ratio of ABS copolymers has important effect on PBT/ABS blends. When the core–shell ratio is higher than 60/40 or lower than 50/50, agglomeration or cocontinuous structure occurs and PBT/ABS blends display lower impact strength. © 2006 Wiley Periodicals, Inc. J Appl PolymSci 102: 5363–5371, 2006     

Compatibilization by main‐chain thermotropic liquid crystalline ionomer of blends of PBT/PP

The miscibility and mechanical properties of the blends of polybutylene terephthalate (PBT) and polypropylene (PP) with a liquid crystalline ionomer (LCI) containing a sulfonate group on the terminal unit as a compatibilizer were assessed. SEM and optical microscopy (POM) were used to examine the morphology of blends of PBT/PP compatibilized by LCI. DSC and TGA were used to discuss the thermal properties of PBT/PP blends with LCI and without LCI. The experimental results revealed that the LCI component affect, to a great extent, the miscibility and crystallization process and mechanical property of PBT/PP blends. The fact is that increasing LCI did improve miscibility of PBT/PP blends and the addition of 1% LCI to the PBT/PP blends increased the ultimate tensile strength and the ultimate elongation. © 2002 Wiley Periodicals, Inc. J Appl Polym Sci 85: 1110–1117, 2002     

In‐situ reinforcement of PBT/ABS blends with liquid crystalline polymer

Ternary in‐situ poly(butylene terephthalate) (PBT)/poly(acrylonitrile‐butadienestyrene) (ABS)/liquid crystalline polymer(LCP) blends were prepared by injection molding. The LCP used was a versatile Vectra A950, and the matrix material was PBT/ABS 60/40 by weight. Maleic anhydride (MA) copolymer and solid epoxy resin (bisphenol type‐A) were used as compatibilizers for these blends. The tensile, dynamic mechanical, impact, morphology and thermal properties of the blends were studied. Tensile tests showed that the tensile stregth of PBT/ABS/LCP blend in the longitudinal direction increased markedly with increasing LCP content. However, it decreased sharply with increasing LCP content up to 5 wt%; thereafter it decreased slowly with increasing LCP content in the transverse direction. The modulus of this blend in the longitudinal direction appeared to increase considerably with increasing LCP content, whereas the incorporation of LCP into PBT/ABS blends had little effect on the modulus in the transverse direction. The impact tests revealed that the Izod impact strength of the blends in longitudinal direction decreased with increasing LCP content up to 10 wt%; thereafter it increased slowly with increasing LCP. Dynamic mechanical analyses (DMA) and thermogravimetric measurements showed that the heat resistance and heat stability of the blends tended to increase with increasing LCP content. SEM observation, DMA, and tensile measurement indicated that the additions of epoxy and MA copolymer to PBT/ABS matrix appeared to enhance the compatibility between PBT/ABS and LCP.     

Effect of ABS grafting degree and compatibilization on the properties of PBT/ABS blends

Blends of PBT/ABS and PBT/ABS compatibilized with styrene‐acrylonitrile‐glycidyl methacrylate (SAG) copolymer were prepared by melt blending method. Grafting degree (GD) of ABS influences the morphology and mechanical properties of PBT/ABS blends. ABS can disperse in PBT matrix uniformly and PBT/ABS blends fracture in ductile mode when ABS grafting degree is more than 44.8%, otherwise, agglomeration takes place and PBT/ABS blends fracture in brittle way. On the other hand, the grafting degree of ABS has no obvious influence on the morphology of PBT/ABS blends and PBT/ABS blends fracture in ductile mode when SAG is incorporated since the compatibilization effect. However, PBT/SAG/ABS blends display much lower impact strength values comparing with PBT/ABS when the blends fracture in ductile way. Side reactions in PBT/SAG/ABS blends were analyzed and which were the main reason for the decrease of impact strength of PBT blends. Tensile tests show that the tensile strength and tensile modulus of PBT blends decrease with the increase of ABS grafting degree due to the higher effective volume. PBT/SAG/ABS blends display much higher tensile properties than PBT/ABS blends since the compatibilization effect. POLYM. COMPOS., 28:484–492, 2007. © 2007 Society of Plastics Engineers     

The effect of recycling number on the mechanical,chemical, thermal,and rheological properties of PBT/PC/ABS ternary blends: With and without glass‐fiber

The recycling possibilities of poly(butylene terephthalate)/polycarbonate/acrylonitrile–butadiene–styrene (PBT/PC/ABS) ternary blend with and without glass‐fiber content were investigated using repeated injection molding process. In this study, PBT/PC/ABS ternary blends were reprocessed at five times and the results were presented after each recycling process. The recycling possibility of PBT/PC/ABS ternary blend was evaluated by measuring the mechanical, chemical, thermal, and rheological properties. Mechanical properties were determined by the tensile strength, yield strength, strain at break, elastic modulus, impact strength, flexural strength, and flexural modulus. Chemical and thermal properties were evaluated by Fourier transform infrared spectroscopy, differential scanning calorimetry, thermal gravimetric analysis, and scanning electron microscopy. Rheological properties of the ternary blends were studied by melt flow index measurement. From the results, it was found that mechanical properties of recycled composites were better than virgin PBT/PC/ABS ternary blends. POLYM. COMPOS., 35:2074–2084, 2014. © 2014 Society of Plastics Engineers     

Phase morphology development during processing of compatibilized and uncompatibilized PBT/ABS blends

The development of the multiphase morphology of uncompatibilized blends of poly(butylene terephthalate) (PBT) and acrylonitrile–butadiene–styrene terpolymer (ABS) and PBT/ABS blends compatibilized with methyl‐methacrylate glycidyl‐methacrylate (MMA‐GMA) reactive copolymers during compounding in a twin‐screw extruder and subsequent injection molding was investigated. Uncompatibilized PBT/ABS 60/40 (wt %) and compatibilized PBT/ABS/MMA‐GMA with 2 and 5 wt % of MMA‐GMA showed refined cocontinuous morphologies at the front end of the extruder, which coarsened towards the extruder outlet. Coarsening in uncompatibilized PBT/ABS blends is much more pronounced than in the compatibilized PBT/ABS/MMA‐GMA equivalents and decreases with increasing amounts of the MMA‐GMA. For both systems, significant refinement on the phase morphology was found to occur after the blends pass through the extruder die. This phenomenon was correlated to the capacity of the die in promoting particles break‐up due to the extra elongational stresses developed at the matrix entrance. Injection molding induces coarsening of the ABS domains in the case of uncompatibilized PBT/ABS blends, while the reactive blend kept its refined phase morphology. Therefore, the compatibilization process of PBT/ABS/MMA‐GMA blends take place progressively leading to a further refinement of the phase morphology in the latter steps, owing to the slow reaction rate relative to epoxide functions and the carboxyl/hydroxyl groups. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci 104: 102–110, 2007     

E/VAC对PC/PBT共混体系性能的影响

针对聚碳酸酯(PC)／聚对苯二甲酸丁二酯(PBT)共混体系相容性差的缺点,采用(乙烯／乙酸乙烯酯)共聚物(E／VAC)作增容剂对其进行改性。研究了E／VAC对PC／PBT共混体系结晶性能和力学性能的影响,并用扫描电子显微镜观察了共混体系的形态结构。结果表明,E／VAC可以提高PC／PBT共混体系的相容性,当E／VAC含量为2％时共混体系的综合性能较好。试验还发现加入E／VAC后PC／PBT共混体系有良好的成型加工性能。     

PET/PBT共混导电复合材料的研究

采用DSC（差示扫描量热法）对PET／PBT合金的相容性进行了研究，探讨了导电炭黑加入量对PET／PBT合金的导电性能与力学性能的影响。结果表明，PET／PBT共混物在非晶区相容而在晶区不相容或部分相容，导电炭黑填充PET／PBT合金的渗流阈值为15％，导电炭黑的填充对合金的力学性能有负面的影响。