玻璃纤维增强PBT/PC共混体系的研究

用双螺杆挤出机制备了不同组成的玻璃纤维增强聚对苯二甲酸丁二酯(PBT)／聚碳酸酯(PC)共混体系,研究了抗冲改性剂及酯交换抑制剂对共混体系力学性能的影响,并用扫描电子显微镜观察了不同共混体系的形态结构。结果表明,抗冲改性剂使共混体系冲击强度提高的同时,降低了共混体系的拉伸强度、弯曲强度及弯曲弹性模量;酯交换抑制剂的加入,降低了共混体系的力学性能,适当的酯交换反应有利于共混体系力学性能的提高;在该体系中PBT与PC相容性较好。     

聚碳酸酯/聚对苯二甲酸丁二醇酯共混物的增容改性

研究了利用酯交换反应生成的共聚酯对PC/PBT共混体系的增容效果,以及对材料的力学性能、微观结构和耐有机溶剂性能的影响.结果表明,随相容剂加入量的增大,材料力学性能出现极大值,材料微观形态显示,相容剂加入对材料增容效果显著,而加入量不足或过量时,在界面的分布的连续性降低,增容作用降低,性能下降.相容剂的加入使材料耐有机溶剂性能得到进一步提高.     

PP/EVOH共混物结构与性能研究

采用丙烯酸接枝聚丙烯（PP-g-AA）、衣康酸接枝聚丙烯 (PP-g-ITA)、马来酸酐接枝聚丙烯 (PP-g-MAH)3种相容剂增容聚丙烯（PP）/乙烯-乙烯醇共聚物(EVOH)共混体系,研究了共混体系的相容性、热性能、力学性能和阻隔性能。红外光谱分析表明,相容性的改善源于相容剂与EVOH之间形成的酯键和氢键。扫描电镜显示,PP-g-AA、PP-g-ITA、PP-g-MAH的增容作用依次增强,共混体系中相容剂增容作用越强,分散相尺寸越小,界面结合越牢固。差示扫描量热分析发现,PP/EVOH增容共混体系中EVOH组分的结晶温度低于不含相容剂的共混体系EVOH组分的结晶温度,PP组分的结晶温度变化则相反。增容共混体系与不含相容剂的共混体系相比,拉伸强度提高了10 MPa,吸油率降幅达0.8 %。     

磷酸化合物对PBT/PC共混物性能的影响

将聚磷酸铵(APP)、焦磷酸钠(SPP)及磷酸三苯酯(TPP)作为酯交换反应抑制剂,分别与聚对苯二甲酸丁二醇酯(PBT)/聚碳酸酯(PC)进行熔融共混,并对不同共混体系的性能进行了研究。DSC用于研究抑制剂与PBT/PC共混体系共混物的结晶行为变化。结果表明,延长共混时间,酯交换反应程度提高,PBT结晶能力减弱,结晶温度降低,三种磷酸化合物对PBT/PC共混物的酯交换反应都能起到抑制作用;DMA用于研究了共混物的相容性,结果表明,抑制剂加入导致PBT与PC发生相分离;红外光谱用于研究共混物基团的特征吸收峰变化情况,结果证明,抑制剂不能完全阻止酯交换的发生;冲击试验机用来测试共混物的冲击强度的变化,结果发现,纯PBT/PC的冲击强度为24 J/m,含有抑制剂的共混物的冲击强度提高,加入TPP后的共混体系缺口冲击强度达到130 J/m左右。     

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。     

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。     

KTR-6C对PC/PBT共混体系性能的影响

研究了丙烯酸酯与甲基雨烯酸缩水甘油酯双官能化的乙烯类弹性体KTR-6C对PC／PBT共混体系相容性以及力学性能的影响。结果表明．KTR-6C的加入．改善了PC／PBT之间的相容性，改善了PC／PBT共混体系的加工流动性能和外观。随着KTR-6C用量的增加．PC／PBT的熔体质量流动速率增加；KTR-6C的加入．起到了很好的增韧作用，极大的提高了PC／PBT共混体系的冲击强度．当其用量为7份时达到最大值．为纯PC／PBT的20倍。     

酯交换反应稳定剂对PBT／PC共混物性能和结构的影响

研究了亚磷酸三苯酯(TPPi)和焦磷酸二氢二钠(DSDP)对聚对苯二甲酸丁二醇酯(PBT)／聚碳酸酯(PC)共混体系中酯交换反应的抑制作用和对共混物性能和结构的影响。结果表明：TPPi和DSDP均能提高共混物的维卡温度，但是，在有增韧剂的PBT/PC共混体系中，TPPi会降低其冲击性能，DSDP则不会降低其冲击性能。对抽提分离物做的FTIR和DSC分析结果证实了DSDP是酯交换反应有效的稳定剂。     

PC/PET合金的制备与性能研究

利用熔融共混法制备了聚碳酸酯/聚对苯二甲酸乙二醇酯(PC/PET)合金,讨论了PC/PET配比、相容剂、酯交换抑制剂对PC/PET合金物理力学性能的影响。结果表明:在PC/PET共混物中添加相容剂可以提高共混物的力学性能,添加磷酸三苯酯(TPP)可以有效抑制PC/PET的酯交换反应;当相容剂用量为5%、PC/PET/TPP为70/30/0.5时,共混合金的综合性能最佳。     

GMA官能化改性剂对PC/PBT合金材料性能的影响

研究了甲基丙烯酸缩水甘油酯(GMA)改性的聚烯烃弹性体对聚碳酸酯(PC)/聚对苯二甲酸丁二醇酯(PBT)合金相容性的影响,以及GMA改性的苯乙烯-丙烯腈共聚物(SAG-005)作为酯交换抑制剂对于PC/PBT合金性能和颜色的影响。结果表明,SOG-02作为GMA官能化改性剂,能够改善PC/PBT合金体系的力学性能,当SOG-02的添加分数为5 phr时,体系能体现最佳的综合力学性能;差示扫描量热仪(DSC)和扫描电子显微镜(SEM)研究均表明,SOG-02能作为PC/PBT合金体系的优良相容剂使用;不同GMA含量的聚烯烃弹性体均能实现PC/PBT合金的超韧化,GMA含量越高,材料流动性能越差;使用SAG-005作为酯交换抑制剂时,效果优于使用无水磷酸二氢钠(AMSP),复配使用SOG-02和SAG-005时,PC/PBT合金材料的综合性能最佳,而且颜色黄度b值最低。     

玻璃纤维增强PC/PBT共混体系力学性能的研究

采用增容剂对玻璃纤维(GF)增强聚碳酸酯(PC)聚/对苯二甲酸丁二酯(PBT)共混体系进行改性,研究了不同成分组成对GF增强PC/PBT材料力学性能的影响,并用扫描电子显微镜观察了不同共混体系的形态结构。结果表明,GF可以提高共混体系的力学性能,当GF质量分数为28%时,共混体系的综合性能较好。     

PE接枝马来酸酐对PC/PBT共混体系性能的影响

采用DSC方法测试了PC/PBT( 70 / 3 0 ,质量分数 )共混体系和在体系中加入PE接枝马来酸酐共混物的玻璃化温度 ,研究了PE接枝马来酸酐对PC/PBT共混体系性能的影响。结果表明 :PE接枝马来酸酐的加入改善了PC/PBT共混体系两相间的相容性 ,而且还起到增韧作用 ,使得共混体系的冲击性能有着明显的提高     

Reactive compatibilization of PP/PBT blends by a mixture of PP‐g‐MA and epoxy resin

In this study, dual compatibilizers composed of the commercially available maleic anhydride‐grafted polypropylene (PP–MA) and a multifunctional epoxy resin were demonstrated to effectively compatibilize the immiscible and incompatible blends of PP and poly(butylene terephthalate) (PBT). The PP–MA with a low MA content is totally miscible with PP to make the PP phase quasi‐functionalized, so that the multifunctional epoxy has the chance to react with PBT and PP–MA simultaneously to form PP–MA‐co‐epoxy‐co‐PBT copolymers at the interface. These desired copolymers are able to anchor along the interface and serve as efficient compatibilizers. The compatibilized blends, depending on the quantity of dual compatibilizers employed, exhibit higher viscosity, finer phase domain, and improved mechanical properties. Epoxy does not show compatibilization effects for the PP/PBT blends without the presence of PP–MA in the blends. © 2001 John Wiley & Sons, Inc. J Appl Polym Sci 79: 2272–2285, 2001     

Effect of core-shell particles dispersed morphology on the toughening behavior of PBT/PC blends

Methyl methacrylate-co-styrene-co-glycidyl methacrylate grafted polybutadiene (PB-g-MSG) and styrene-co-glycidyl methacrylate grafted polybutadiene (PB-g-SG) core-shell particles were prepared to toughen poly (butylene terephthalate) (PBT) and polycarbonate (PC) blends. The compatibilization reaction between the epoxy groups of glycidyl methacrylate and the carboxyl groups of PBT induced the PB-g-SG particles dispersed in the PBT phase. On the other hand, the good miscibility between PMMA (the shell phase of PB-g-MSG) and PC induced the PB-g-MSG particles dispersed in the PC phase. The different phase morphology led to different toughening behavior. The PBT/PC/PB-g-MSG blends with the PC encapsulated morphology showed much lower brittle-ductile transition core-shell particles content (10-15 wt% or 15-20 wt%) compared with the PBT/PC/PB-g-SG blends (20-25 wt%). The difference between the toughening efficiency of the core-shell particles was due to the change of deformation mechanisms. In PBT/PC/PB-g-MSG blends, the cavitation of PB rubber phase led to the occurrence of shear yielding of the matrix. While in the PBT/PC/PB-g-SG blends, the debonding between PBT and PC interface induced the shear yielding of the matrix. The variation of the core-shell particles dispersed phase morphology also affected the crystallization properties and DMA results of the PBT/PC blends. Modification of the phase morphology provided an useful strategy to prepare PBT/PC blends with higher toughening efficiency.     

Toughening modification of PBT/PC blends with PTW and POE

New toughened poly(butylene terephthalate) (PBT)/bisphenol A polycarbonate (PC) blends were obtained by melt blending with ethylene–butylacrylate–glycidyl methacrylate copolymer (PTW) and ethylene‐1‐octylene copolymer (POE) in a twin‐screw extruder. The mechanical properties of PBT/PC blends were investigated. The presence of PTW or POE could improve the mechanical properties except for the tensile strength and flexural properties of the PBT/PC blends. However, a combination use of PTW and POE had a strong synergistic effect, leading to remarkable increases in the impact strength, elongation at break, and Vicat temperature and some reduction of the tensile strength and flexural properties. The relationship between mechanical properties and morphology of the PBT/PC/PTW/POE blends was studied. The morphology was observed by scanning electron microscopy and the average diameter of dispersed phase was determined by image analysis, and the critical interparticle distance for PBT/PC was determined. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 101: 54–62, 2006     

相对分子质量对玻纤增强PBT/PC的影响

选用不同相对分子质量的聚对苯二甲酸丁二醇酯(PBT)及聚碳酸酯(PC)，通过双螺杆挤出机制备了一系列玻璃纤维增强PBT／PC的共混物。通过对共混物力学性能的测试以及用电子显微镜观察共混物的形态结构，研究了共混物组分的相对分子质量对共混体系的影响。结果表明，共混物组分的相对分子质量对共混物的相容性及性能影响非常显著。     

Improved Toughness of Polylactide by Binary Blends with Polycarbonate with Glycidyl and Maleic Anhydride-Based Compatibilizers

This work reports on the development of polylactide (PLA) and polycarbonate (PC) blends with different compatibilizers with enhanced toughness. Since both polymers are immiscible, two types of compatibilizers are tested: petrochemical-based copolymers Xibond 160 and Xibond 920 with maleic anhydride and epoxy groups, respectively, and natural-based compatibilizers with the same functionalities, namely maleinized linseed oil (MLO) and, epoxidized linseed oil (ELO). Mechanical, thermal, and morphological characterization shows better properties for the PLA/PC (80/20 wt%) blends with chemically modified natural oils (ELO and MLO). The addition of 5 phr (parts per hundred resin) of MLO gives the maximum values for impact strength and elongation at break. Moreover, the glass transition temperature (T_g) slightly decreases with the addition of natural compatibilizers, thus showing some plasticization effect. Petroleum-derived compatibilizers give interesting results regarding tensile strength and stiffness without plasticization. PLA/PC blends show higher thermal stability than neat PLA, regardless of the compatibilizer used, since PC is much more thermally stable than PLA. The obtained results indicate that both petroleum-based and natural-derived compatibilizers positively contribute to enhance the properties of the binary PLA/PC blends. Nevertheless, the results with MLO suggest this is an interesting biobased solution to provide increased toughness to PLA/PC blends.     

A study on the use of phenoxy resins as compatibilizers of polyamide 6 (PA6) and polybutylene terephthalate (PBT)

In this study we investigated the potential of phenoxy resins as compatibilizers in the blending of two high‐volume engineering thermoplastics—polyamide 6 (PA6) and polybutylene terephthalate (PBT), in an effort to establish the usefulness of blending as a method of recycling of mixed plastic wastes. It was found that phenoxy resins formed miscible blends with PBT, formed grafted copolymers with PBT through ester exchange reactions, and—though formed immiscible blends with PA6—produced energetic interactions in the form of hydrogen bonding with PA6. The ternary blend systems of 70 parts PA6, 30 parts PBT, and respectively 5, 10, and 30 parts phenoxy resins, all by weight, revealed at two‐phase nature—PA6 as the continuous phase and miscible blends of PBT and phenoxy resins as the dispersed phase—and were found to be stable to phase coarsening by annealing with mechanical properties at least as good as those of the component polymers.     

PC／PBT共混物的流变行为研究

考察了聚碳酸酯/聚对苯二甲酸丁二醇酯(PC/PBT)共混物的流变行为。研究发现:PBT的加入,可使共混体系的粘流活化能增大,流动性增加;在PC/PBT共混物中加入EVA可进一步增加PC与PBT的相容性,并提高其流动性能。