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。     

相容剂对PBT／PC共混物力学性能的影响

利用聚对苯二甲酸丁二醇酯(PBT)与聚碳酸酯(PC)之间的酯交换反应制备了几种PBT与PC的相容剂。相容剂对PBT／PC共混物力学性能的影响的研究表明：加入相容剂改善了PBT与PC两相间的相容性，共混体系力学性能得到提高。通过红外光谱分析得知，PBT、与PC之间的酯交换反应促进了PBT／PC共混体系的相容性，酯交换反应越强烈，得到的产物作为相容剂对PBT／PC共混体系的增容作用越明显；酯交换反应程度适中，得到的产物作为相容剂增容作用适中，共混体系综合力学性能较好。     

PC/PBT合金增韧改性的研究

研究了“核-壳”结构的丙烯酸酯类(ACR)抗冲改性剂对PC／PBT(80／20)合金力学性能和耐热性的影响;并用扫描电子显微镜对共混物的微观形态结构进行了分析。结果表明：随ACR抗冲改性剂的增加,共混物的冲击强度先增后降,当ACR的用量为15份时,出现最大值;同时共混物的拉伸强度和维卡软化温度都降低。     

高性能PC/PBT合金材料的制备

实验中选择7/3的PC/PBT配比,无水磷酸二氢钠做为酯交换抑制剂,MBS和功能树脂作为抗冲改性剂,双酚A双(二苯基磷酸酯)作为阻燃剂,PC-PBT共聚物作为相容剂的玻璃纤维增强PC/PBT材料。结果显示材料悬臂梁缺口冲击强度达到125 J/m,拉伸强度达到135 MPa,弯曲强度达到210 MPa。耐高温性能优异,本实验样品热变形温度(HDT)可以达到126℃,能够满足需求。阻燃性能达到UL94 V-0阻燃等级。     

超高韧ABS/PBT/PC合金制备及低温多轴冲击性能表征

采用双螺杆挤出机熔融共混制备丙烯腈-丁二烯-苯乙烯共聚物/聚对苯二甲酸丁二醇酯/聚碳酸酯(ABS/PBT/PC)三元合金,研究了不同质量分数的PBT、PC对三元合金的耐刹车油腐蚀性能和力学性能的影响。结果表明:PBT可以有效改善ABS/PBT/PC合金的耐刹车油性能;PC能提高合金的缺口冲击强度,使材料表现出更优异的韧性;酯交换抑制剂的加入,稳定了三元合金体系,使材料拥有更稳定的低温抗冲击性能。     

MBS对PBT/PC共混体系性能的影响

研究了甲基丙烯酸甲酯-丁二烯-苯乙烯接枝共聚物(MBS)作为抗冲击改性剂,对聚对苯二甲酸丁二醇酯/聚碳酸酯(PBT/PC)共混体系力学性能和耐热性的影响,并用扫描电子显微镜对共混物的亚微观形态结构进行了分析.结果表明:MBS的加入改善了PBT/PC共混体系的加工流动性能和外观;随着MBS用量的增加,PBT/PC共混体系的冲击强度不断增大,拉伸强度和耐热性下降,但耐热性下降幅度较小.     

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。     

酯交换抑制剂对玻璃纤维增强PC/PBT合金性能的影响的探究

在聚碳酸酯/聚对苯二甲酸丁二醇酯/玻璃纤维/增韧剂(PC/PBT/30GF/5PTW)复合材料体系中分别添加磷酸二氢钠和亚磷酸三苯酯两种酯交换抑制剂,研究了酯交换抑制剂含量在0.5%～2%变化下对复合材料力学性能、结晶性能、热稳定性、熔体流动性、耐热性的影响。通过对比不同含量的酯交换抑制剂的复合材料性能差异性,优选出玻璃纤维增强PC/PBT合金中适量的酯交换抑制剂。我们发现分别添加0.5%NaH_2PO_4和TPPI与未添加相比复合材料的弯曲模量明显提高,刚性增大,其他力学性能保持接近。当酯交换抑制剂含量超过1%时,添加TPPI的复合材料的强度急剧下滑,而添加NaH_2PO_4的复合材料的强度趋于稳定。通过热重分析得出酯交换抑制剂的添加有利于提高复合材料的热稳定性,分别添加1.5%、2%TPPI复合材料起始分解温度分别提高了110.2、140.4℃,最大分解速率温度分别提高了130、130.8℃,有效地减缓了复合材料在高温下的热失重行为。     

超韧PBT/PC共混物的研制

研究了3种增韧剂SWR-6B、AX8900和EXL-2691A对PBT/PC(80/20)共混物力学性能和耐热性的影响,并用扫描电子显微镜对PBT/PC共混物的微观形态结构进行了分析。结果表明,随着增韧剂用量的增加,PBT/PC共混物的缺口冲击强度不断提高,当3种增韧剂各自的用量增加到20份时,PBT/PC共混物的缺口冲击强度均达到600 J/m以上,约为未加入增韧剂时的10倍;当增韧剂的用量增加到30份时,PBT/PC共混物的缺口冲击强度达到900 J/m以上,同时共混物的拉伸强度和弯曲强度降低,而维卡软化温度仍高于200℃。     

增韧剂MBS对PC/PBT合金性能的影响

通过添加酯交换抑制剂磷酸二氢钠(NaH_2PO_4)以及两种不同的甲基丙烯酸甲酯-丁二烯-苯乙烯(MBS)共聚物,制备了增韧改性的聚碳酸酯/聚对苯二甲酸丁二醇酯(PC/PBT)合金,对其力学性能、耐热性能、相形态进行了研究。结果表明,增韧剂MBS能够显著提高PC/PBT合金的冲击性能,其中MBS2602能够显著改善低温冲击性能,当MBS2602含量为16%,PC/PBT质量比50/50时,-20℃下的冲击强度为648.6 J/m。热变形温度、拉伸强度以及模量随着MBS含量的提高而有所降低。MBS均匀地分散于基体中,其含量增加会使共混物相界面更加模糊,冲击性能更好。     

新型增容剂对PC/PBT合金性能的影响

研究了新型增容剂丙烯酸酯与甲基丙烯酸缩水甘油酯双官能化乙烯类弹性体（KY-6B）对PC／PBT合金性能及结构的影响。结果表明,随着KY-6B含量的增加,PC／PBT合金的拉伸强度、弯曲强度及弯曲弹性模量逐渐降低,而缺口冲击强度、断裂伸长率逐渐提高,非缺口冲击强度变化不大。当KY-6B含量超过10％后,PC／PBT合金的上述性能变化不明显。红外图谱显示,KY-6B的存在使PC与PBT的C=0吸收峰更靠近。差示扫描量热测试结果表明,KY-6B可使PC／PBT合金中PC与PBT两者的Tg之差减小,PBT的熔点、熔融焓、结晶温度有所降低。扫描电镜图谱显示,随KY-6B含量增加,PC／PBT合金的冲击断面逐渐变得粗糙,孔洞化和银纹丝状连接增多。上述结果都表明KY-6B是PC／PBT合金的优良增容剂和抗冲击改性剂。     

ACR增韧PBT/PC合金的研究

研究了“核-壳”结构的ACR对PBT/PC(质量比80/20)合金的力学性能和耐热性的影响。结果表明:随着ACR用量增加,共混物的缺口冲击强度不断增大,而拉伸强度、弯曲强度、维卡耐热度降低。当ACR的加入量为5份时,缺口冲击强度提高1倍,当ACR的加入量为30份时,缺口冲击强度约为纯PBT/PC合金的5倍。从增韧效果来看,FM50略好于KM355。     

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     

新型增容剂对 PC/PBT合金性能的影响

研究了新型增容剂丙烯酯与缩水甘油酯双官能化的乙烯类弹性体(KY-6B)对PC/PBT合金的性能及结构的影响.结果表明,随着KY-6B含量的增加,C/PBT合金的拉伸强度、弯曲强度及弯曲模量逐渐下降,而缺口冲击强度、断裂伸长率逐渐上升,非缺口冲击强度变化不大.PC/PBT合金的上述性能当KY-6B含量超过8%时变化不明显.IR图谱显示,Y-6B的存在使PC与PBT的C=O吸收峰更靠近.DsC测试结果表明,Y-6B可使PC/PBT合金中PC与PBT两者的Tg之差减小,BT的熔点、熔融烩、结晶温度有所降低.SEM图谱显示,随KY-6B含量增加,PC/PBT合金的冲击断面逐渐变得粗糙、孔洞化和银纹丝状连接增多.上述测试结果都表明KY-6B是PC/PBT合金的优良增容剂和冲击改性剂.     

纳米二氧化硅对PBT力学和结晶性能的影响

采用熔融共混的方法,将纳米SiO2添加到聚对苯二甲酸丁二醇酯(PBT)中,制备出PBT/纳米SiO2复合材料,对其力学和结晶性能进行分析研究。结果表明,随着纳米SiO2含量增加,PBT/纳米SiO2复合材料的拉伸强度和弯曲强度增加,PBT的结晶度增加,球晶尺寸减小,最大扭矩和平衡扭矩变化不大。当纳米SiO2含量为0.1份时,PBT的拉伸强度提高12%,断裂伸长率提高100%,冲击强度提高10%,弯曲强度提高5%,综合力学性能最好。     

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。     

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     

Properties of uncompatibilized and compatibilized poly(butylene terephthalate)–LLDPE blends

In this work, blends of poly(butylene terephthalate) (PBT) and linear low‐density polyethylene (LLDPE) were prepared. LLDPE was used as an impact modifier. Since the system was found to be incompatible, compatibilization was sought for by the addition of the following two types of functionalized polyethylene: ethylene vinylacetate copolymer (EVA) and maleic anhydride‐grafted EVA copolymer (EVA‐g‐MAH). The effects of the compatibilizers on the rheological and mechanical properties of the blends have been also quantitatively investigated. The impact strength of the PBT–LLDPE binary blends slightly increased at a lower concentration of LLDPE but increased remarkably above a concentration of 60 wt % of LLDPE. The morphology of the blends showed that the LLDPE particles had dispersed in the PBT matrix below 40 wt % of LLDPE, while, at 60 wt % of LLDPE, a co‐continuous morphology was obtained, which could explain the increase of the impact strength of the blend. Generally, the mechanical strength was decreased by adding LLDPE to PBT. Addition of EVA or EVA‐g‐MAH as a compatibilizer to PBT–LLDPE (70/30) blend considerably improved the impact strength of the blend without significantly sacrificing the tensile and the flexural strength. More improvement in those mechanical properties was observed in the case of the EVA‐g‐MAH system than for the EVA system. A larger viscosity increase was also observed in the case of the EVA‐g‐MAH than EVA. This may be due to interaction of the EVA‐g‐MAH with PBT. © 1999 John Wiley & Sons, Inc. J Appl Polym Sci 72: 989–997, 1999     

Toughening of poly(butylene terephthalate) by polyacrylic impact modifier

Core–shell structured polyacrylic (named ACR) impact modifiers consisting of a rubbery poly(n-butyl acrylate) (BA) core and a rigid poly(methyl methacrylate) shell with a size of about 310 nm were prepared by seed emulsion polymerization. The ACR modifiers with different core–shell weight ratios (85:15; 80:20; 75:25; 70:30) were used to modify the toughness of poly(butylene terephthalate) (PBT) by melt blending. It was found that the polymerization had a very high instantaneous conversion (>90 %) and overall conversion (98 %). The ACR latexes had an obvious core–shell structure confirmed by transmission electron microscope. The mechanical properties of the PBT/ACR blends were evaluated, and scanning electron microscope (SEM) was used to observe the fractured morphology. Dynamic mechanical analysis and differential scanning calorimeter were used to study the molecular movement and crystallization behaviors of PBT/ACR blends. The results indicated that with an appropriate value of the core–shell weight ratio, poly(BA) could disperse well in the matrix and the brittle–ductile transition point could emerge. As a result, the notch impact strength of PBT/ACR blends with a core–shell weight ratio of 80:20 was 6.7 times greater than that of pure PBT, and the mechanical properties agreed well with the SEM observation.