含磷化合物对PBT/PC合金酯交换反应的影响

采用差示扫描量热(DSC)仪研究了聚对苯二甲酸丁二酯(PBT)和PBT/聚碳酸酯(PC)在两次升降温过程中熔融和结晶行为的变化,比较了亚磷酸三苯酯、十八烷基亚磷酸酯、季戊四醇二亚磷酸酯3种含磷化合物对PBT/PC合金酯交换反应的影响。研究发现,添加十八烷基亚磷酸酯的PBT/PC合金的结晶温度可达194.0℃,而且两次升降温过程中熔点和结晶温度的变化小于1.0℃。相比亚磷酸三苯酯和季戊四醇二亚磷酸酯,十八烷基亚磷酸酯作为PBT/PC合金酯交换反应的抑制剂,抑制效果较好。     

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。     

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。     

环氧树脂对聚对苯二甲酸丁二酯共混物的增韧增强研究

利用环氧树脂(EP)与聚对苯二甲酸丁二醇酯(PBT)的相容性,考察了EP对共混物PBT/ABS-gGMA性能的影响。采用动态力学分析仪(DMA)、旋转流变仪、Haake流变仪和扫描电镜(SEM)研究共混物的性能。DMA、DSC和旋转流变仪的测试结果表明PBT与EP是相容的;流变性能测试结果表明EP对PBT/ABS-g-GMA共混体系起到增容作用;SEM观察结果发现少量的EP加入对共混物的相形态没有明显影响,分散相在PBT基体中均匀、稳定分散,而过量的EP使共混物中出现一些较大的相区,分散相发生团聚;力学性能测试结果表明适量的EP就能明显提高共混物的冲击性能,而过量的EP又会使共混物的冲击强度下降。     

官能化聚烯烃弹性体增韧PBT

对马来酸酐接枝乙烯-辛烯共聚物(POE-g-MAH)和乙烯-丙烯酸甲酯-甲基丙烯酸缩水甘油酯三元共聚物(E-MA-GMA)增韧聚对苯二甲酸丁二酯(PBT)进行了研究。结果表明,与POE-g-MAH相比较,E-MA-GMA与 PBT之间有更强的界面相互作用,在PBT基体中有更加细微的分散,而且E-MA-GMA的粒子间距明显小于POE- g-MAH,致使PBT/E-MA-GMA共混体系在较低弹性体含量下出现脆/韧转变。     

Crystallization behavior of PBT/ABS polymer blends

Poly(butylene terephthalate) (PBT) crystallization behavior is modified by blending it with acrylonitrile‐butadiene‐styrene copolymers (ABS). The effects of ABS on melting and crystallization of PBT/ABS blends have been examined. Most ABS copolymers of different rubber content and styrene/acrylonitrile ratios studied showed little effect on the melting behavior of PBT crystalline phase. However, ABS copolymer with high acrylonitrile content had a significant effect on the crystallization behavior of the PBT/ABS blends. The nucleation rate of the PBT crystalline phase decreased due to the presence of the high acrylonitrile content ABS, whereas the spherulitic growth rate increased significantly. These phenomena are attributed to changes in nucleation and growth mechanisms of PBT crystalline phase promoted by ABS. © 1999 John Wiley & Sons, Inc. J Appl Polym Sci 71: 423–430, 1999     

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℃。     

Melting,crystallization behaviors,and nonisothermal crystallization kinetics of PET/PTT/PBT ternary blends

The melting, crystallization behaviors, and nonisothermal crystallization kinetics of the ternary blends composed of poly(ethylene terephthalate), poly(trimethylene terephthalate) (PTT) and poly(buthylene terephthalate) (PBT) were studied with differential scanning calorimeter (DSC). PBT content in all ternary blends was settled invariably to be one‐third, which improved the melt‐crystallization temperature of the ternary blends. All of the blend compositions in amorphous state were miscible as evidenced by a single, composition‐dependent glass transition temperature (T_g) observed in DSC curves. DSC melting thermograms of different blends showed different multiple melting and crystallization peaks because of their various polymer contents. During melt‐crystallization process, three components in blends crystallized simultaneously to form mixed crystals or separated crystals depending upon their content ratio. The Avrami equation modified by Jeziorny and the Ozawa theory were employed to describe the nonisothermal crystallization process of two selected ternary blends. The results spoke that the Avrami equation was successful in describing the nonisothermal crystallization process of the ternary blends. The values of the t_1/2 and the parameters Z_c showed that the crystallization rate of the ternary blends with more poly(ethylene terephthalate) content was faster than that with the lesser one at a given cooling rate. The crystal morphology of the five ternary blends investigated by polarized optical microscopy (POM) showed different size and distortional Maltese crosses or light spots when the PTT or poly(ethylene terephthalate) component varied, suggesting that the more the PTT content, the larger crystallites formed in ternary blends. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci, 2007     

PBT/PC/E-MA-GMA三元共混体系的力学性能与亚微相态

将乙烯-丙烯酸甲酯-甲基丙烯酸缩水甘油酯(E-MA-GMA)三元共聚物与聚碳酸酯(PC)增韧聚对苯二甲酸丁二酯(PBT),研究了其力学性能、亚微相态和强韧化机制。结果表明,当m(PBT)／m(PC)为50:50,三元共混体系在w(E-MA-GMA)为10％时,缺口冲击强度达93 kJ／m2,同时拉伸强度达到54 MPa。扫描电子显微镜观察发现,E- MA-GMA作为柔性界面层,起到反应性增容作用,使PC分散相的相畴尺寸变小。PC相特有的相形态以及柔性界面层的存在是三元共混体系强韧化的主要机制。     

PC/PBT合金材料汽车门把手异常变黄现象的改进

针对自制聚碳酸酯(PC)/聚对苯二甲酸丁二酯(PBT)合金材料在注塑成型汽车门把手过程中的异常变黄现象原因进行分析。对操作人员、注塑成型设备、加工工艺及材料配方等影响因素进行了分析。对配方中的PC,PBT分别进行250~300℃程序升温注塑实验无变黄现象,抗氧剂、硅油助剂分别进行热失重实验也没有发生明显失重现象。PC/PBT合金材料在料筒中熔胶后立即注塑成型时,随着PBT含量的增加,PC/PBT合金材料变黄现象越明显;相同PBT含量下,在料筒中停留时间越长变黄现象越明显。实验结果表明,PC,PBT熔融混合加工过程中发生酯交换反应引起PC/PBT合金材料变黄现象。通过在合金材料配方中添加磷酸二氢钠作为酯交换抑制剂,有效降低了门把手的变黄现象。     

Solid state features and mechanical properties of PEI/PBT blends

Extrusion‐blended and injection‐molded PEI/PBT blends were found to be miscible whatever the composition. The processability of the blends clearly improved with the presence of PBT. The melt pressure at the exit was seen to be a parameter as representative of the processability of the blends as the torque of blending. In the blends with 80 and 90% PBT, a positive volume of mixing and the maintenance of the crystallinity of PBT were seen. However, in the rest of the blends, negative volumes of mixing and important decreases in the crystallinity of PBT were found. These solid state features gave rise to a ductility similar to that of the pure PEI and to a synergism of the modulus of elasticity and of the yield stress in the 90/10 and 80/20 blends such that the values were higher than those of either of the pure components. © 2001 John Wiley & Sons, Inc. J Appl Polym Sci 80: 885–892, 2001     

PBT/PC材料在证件制作中的应用研究

研究了聚对苯二甲酸丁二醇酯(PBT)/聚碳酸酯(PC)合金薄膜材料的透光率、表面张力、表面电阻、碳粉附着力、打印顺畅性等证件行业需求的薄膜材料特性;用PBT/PC合金薄膜材料与聚对苯二甲酸乙二醇酯-1,4环己烷二甲醇酯(PETG)卡基材料在一定温度、压力下层压制证,研究了其最佳层压制证条件,研究了PBT/PC合金薄膜材...     

有机硅磷酸酯对PBT/PET酯交换反应的影响

采用两次循环扫描方法研究了有机硅磷酸酯对聚对苯二甲酸丁二醇酯/聚对苯二甲酸乙二醇酯（PBT/PET）酯交换反应的影响,测定了PBT/PET合金的结晶性能、热变形温度、力学性能和相对黏度,并与常规的抑制剂亚磷酸三苯酯进行了比较。结果发现：加入有机硅磷酸酯后PBT/PET合金的结晶温度提高了4.5 ℃,相对黏度提高了0.1 dL/g,热变形温度提高了7.0 ℃。而加入亚磷酸三苯酯后PBT/PET合金的结晶温度降低了1.5 ℃。说明有机硅磷酸酯可有效控制PBT/PET合金中端羟基的含量,从而可有效抑制PBT和PET之间的酯交换反应。亚磷酸三苯酯和有机硅磷酸酯的加入对PBT/PET体系的力学性能影响不大。     

PC/PBT合金增韧研究

分别以单或双官能化乙烯类弹性体E-nBA、E-MA-GMA和E-AE-MAH为增韧剂,通过熔融共混挤出,对聚碳酸酯(PC)/聚对苯二甲酸丁二酯(PBT)(50/50)合金进行增韧.研究了增韧剂含量对合金的力学性能、流动性能、热变形温度的影响;用DSC研究了共混物的非等温结晶行为;并且通过SEM对共混物的断面形貌进行了分...     

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。     

Preparation and properties of PC/SAN alloy modified with styrene‐ethylene‐butylene‐styrene block copolymer

A polycarbonate (PC)/ poly (styrene‐co‐acrylonitrile) (SAN) alloy modified with styrene‐ethylene‐butylene‐styrene (SEBS) block copolymer was prepared and the influence of SEBS content, PC content, and types of modifier on Izod notched impact strength, tensile strength, flexural strength, and Vicat softening temperature was studied. The results showed that the addition of SEBS could obviously increase the Izod notched impact strength and the elongation at break and decrease the tensile and flexural strength and Vicat softening temperature. PC/SAN alloy modified with SEBS had better mechanical properties than the PC/SAN alloy modified with ABS. DSC analysis and SEM photographs revealed that the SEBS was not only distributed in the SAN phase but also distributed in PC phase in a PC/SAN/SEBS alloy while the ABS was mainly distributed in SAN phase in a PC/SAN/ABS alloy. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci, 2007     

Morphology monitoring of PE/PBT blends by reactive processing

Polyethylene (PE)/poly(butylene terephthalate) (PBT) blends were in situ compatibilized during a processing operation by the addition of a partially hydroxylated ethylene vinyl acetate copolymer (EVAh). This copolymer, obtained from ethylene vinyl acetate (EVA), was as compatible with PE as EVA was before modification. In the presence of EVAh, the dispersion of PBT in the PE matrix was finer, and the interfacial adhesion was improved. These results are relevant for the compatibilization of PE/PBT blends. Moreover, such blends present good toluene barrier properties. © 2001 John Wiley & Sons, Inc. J Appl Polym Sci 82: 3568–3577, 2001     

PC/PET共混合金相容性的研究

采用差示扫描量热仪、扫描电镜等测试手段对聚碳酸酯/聚对苯二甲酸乙二醇酯（PC/PET）共混合金的相容性进行研究。结果表明,未添加相容剂时,随PET含量的增加,共混合金的两个玻璃化转变温度有相互靠近的趋势,说明此体系部分相容。PET的加入可明显改善共混合金的加工流动性。PET含量为65 %左右时改善效果最佳。相容剂的加入使共混合金的拉伸强度和弯曲强度略有下降,但缺口冲击强度得到较大提高,在PC/PET（30/70）中添加3份乙烯-丙烯酸丁酯-甲基丙烯酸缩水甘油酯（PTW）或7份乙烯-丙烯酸乙酯共聚物（EEA）即可使缺口冲击强度由5.5 kJ/m2提高到10 kJ/m2以上。含有甲基丙烯酸缩水甘油酯（GMA）基团的相容剂PTW对两相界面的改善效果最好。     

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。