LCP与PA66共混物的DSC分析与相容性研究

用溶液共混的方法制备热致聚酯酰胺液晶（LCP）和尼龙66（PA－66）共混物,用DSC、POM、WAXD等手段对共混物进行了表征。DSC和POM研究结果表明,LCP与PA－66之间有较好的相容性,LCP能在PA－66中较均匀分散,LCP的加入影响了PA－66的熔融和结晶行为,少量的LCP有利于PA－66的结晶,WAXD结果表明,LCP掺入了PA－66的结晶过程、形成共晶。     

热致液晶共聚酯/PA6/RSMA原位复合材料2.力学性质与破坏行为

选用Vectra A950热致液晶共聚酯（LCP）制备热致液晶共聚酯（LCP）/聚酰胺6（PA6）/苯乙烯-马来酸酐无规共聚物（RSMA）三元共混物。并注射成型制得复合板材。研究三元LCP/PA6/RSMA原位复合材料的形态结构、力学性质和破坏行为。结果表明,PSMA是LCP/PA6复合材料的有效增容剂。RSMA的加入有利于LCP在PA6基体中原位成纤,增强了两相之间的界面粘接。加入RSMA后,LCP/PA6原位复合材料的杨氏模量、抗拉强度和抗冲击强度明显提高。RSMA能延长LCP/PA6复合材料的裂纹引发时间、增加裂纹引发能和总冲击能。对LCP/PA6原位复合材料有增韧作用。RSMA的加入量存在一临界值。     

热致液晶共聚酯/PA6/RSMA原位复合材料1.RSMA对热致液晶共聚酯/PA6共混体系的增容作用

选用Vectra A950热致液晶共聚酯（LCP）,制备热致液晶共聚酯（LCP）／聚酰胺6（PA6）／苯乙烯－马来酸酐无规共聚物（RSMA）三元共混物,采用注射成型的方法实现原位复合,测定复合材料的熔体流变性能,FTIR光谱,动态力学性质和共混物形态结构,研究了RSMA对聚酰胺6／热致液晶共聚酯共混体系的增容作用,结果表明,RSMA的加入提高了LCP／PA6共混体的熔体粘度：RSMA与LCP和PA6发生酯化,酰胺化反应,改善了LCP与PA6之间的相容性,使两者的玻璃化温度相互靠近,了LCP在PA6基体中的分散,增强了两者之间的界面粘接。     

THERMAL TRANSITIONS AND MORPHOLOGICAL BEHAVIOR OF POLYETHER ETHER KETONE AND LIQUID CRYSTALLINE POLYMER BLENDS

Polyether ether ketone (PEEK) and thermotropic liquid crystalline polymer (TLCP) based on hydroxy benzoic acid and hydroxy naphthoic acid (HBA/HNA) were prepared on a single-screw extruder with rotor speed 45 rpm at 350°C. Thermal analysis data, especially the glass transition temperature (T_g), indicated that the blends were incompatible in the entire range of concentration. Melting temperature (T_m) of the blends was found to be close to melting temperature of pure PEEK. Thermogravimetric analysis data show the poor thermal stability of the blends compared to the parent material. The percent weight loss increased with increasing LCP concentration. Analysis with a scanning electron microscope clearly indicated that a distinctive fibrous morphology was developed in the extruded samples at the low concentration of LCP, but the adhesion of the fiber to the PEEK matrix was poor, with circular voids around the LCP phase at higher concentration.     

2009～2010年世界塑料工业进展

收集了2009年7月～2010年6月世界塑料工业的相关资料,介绍了2009～2010年世界塑料工业的发展情况,提供了世界塑料产量、消费量及全球各类树脂的需求量及产能情况.按通用热塑性树脂(聚乙烯、聚丙烯、聚苯乙烯、聚氯乙烯、ABS树脂),工程塑料(尼龙、聚碳酸酯、聚甲醛、热塑性聚酯、聚苯醚),特种工程塑料(聚苯硫醚、液晶聚合物、聚醚醚酮),通用热固性树脂(酚醛、聚氨酯、不饱和聚酯树脂、环氧树脂)不同品种的顺序,对树脂的产量、消费量、供需状况及合成工艺、产品应用开发、树脂品种的延伸及应用的进一步扩展等技术作了详细介绍.     

Compatibilization of syndiotactic polystyrene and a thermotropic liquid‐crystalline polymer blend with a zinc salt of a sulfonated polystyrene ionomer

A zinc salt of a lightly sulfonated (4.5 mol %) polystyrene ionomer was used to compatibilize a 3/1 (w/w) blend of syndiotactic polystyrene and a wholly aromatic thermotropic liquid‐crystalline polymer (TLCP). The addition of the ionomer significantly reduced the dispersed TLCP domain size and improved the tensile strength, ultimate elongation, and flexural toughness of the blend. © 2002 Wiley Periodicals, Inc. J Appl Polym Sci 87: 564–568, 2003     

炼油厂PROVOX系统LCP点应用实例

在引进的ＰＲＯＶＯＸＤＣＳ系统中，运用ＬＣＰ点的复杂控制功能，可以满足工艺生产要求。以应用的具体实例介绍了ＦＳＴ语句的编写过程。     

Graft copolymerization of methyl methacrylate with an N‐substituted maleimide–liquid‐crystalline copolymer by atom transfer radical polymerization

The synthesis of novel copolymers consisting of a side‐group liquid‐crystalline backbone and poly (methyl methacrylate) grafts were realized by the use of atom transfer radical polymerization (ATRP). In the first stage, the bromine‐functional copolymers 6‐(4‐cyanobiphenyl‐4′‐oxy)hexyl acrylate and (2,5‐dioxo‐2,5‐dihydro‐1H‐pyrrole‐1‐yl)methyl 2‐bromopropanoate were synthesized by free‐radical polymerization. These copolymers were used as initiators in the ATRP of methyl methacrylate to yield graft copolymers. Both the macroinitiator and graft copolymers were characterized by ¹H‐NMR, gel permeation chromatography, differential scanning calorimetry, and thermogravimetric analysis. The ATRP graft copolymerization was supported by an increase in the molecular weight of the graft copolymers compared to that of the macroinitiator and also by their monomodal molecular weight distribution. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci, 2008     

Experimental results for the rheological and rheo‐optical behavior of poly(ethylene terephthalate)/liquid‐crystalline polymer blends

The use of thermoplastic/liquid‐crystalline polymer (LCP) blends is recognized as a good strategy for reducing viscosity and improving mechanical properties relative to pure thermoplastics. This improvement, however, is only noticeable if the LCP fibrillates, in situ, during processing and the fibrils are kept in the solid state. In this article, we report a morphological, rheological, and rheo‐optics study performed with two blends of poly(ethylene terephthalate) with a LCP, Rodrun LC3000 (10 and 25 wt % LCP content), and we show that the obtained droplet‐shape relaxation time (the time the deformed droplet took to regain its spherical form after the cessation of flow) allowed for the explanation of the morphological observations. In fact, the droplet‐shape relaxation time was higher for the blend with higher LCP content, for the higher experimentally accessible shear rates, and still increased at the highest shear rate, which explained the fibrils of the LCP dispersed phase observed in this blend, whereas for the lower LCP content blend, the droplet‐shape relaxation time reached a low‐value plateau for higher shear rates, which explained the absence of fibrillation in this blend. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci 2008