聚苯醚合成与改性应用前景广阔

聚苯醚(PPO)和改性聚苯醚(MPPO)是一种耐高温的热塑性工程塑料，由于PPO树脂本身熔体流动性差，不易热塑加工，若采用高抗冲击聚苯乙烯等共混改性，而制成改性聚苯醚，不但能保持PPO树脂优良的综合性能，同时能有效改善PPO树脂的加工性能，且成本大幅度降低。目前聚苯醚及改性聚苯醚成为世界上开发最成功的高分子合金之一，以其优良的性能和众多品种，发展成为当今世界五大工程塑料之一。     

覆铜板用热固性聚苯醚

聚苯醚 (PPE)是一种高性能热塑性工程塑料 ,具有优异的电性能和耐热性能。为适应某些特殊场合 ,例如覆铜板行业 ,需要改性为热固性材料。综述了聚苯醚的热固性化的几种方法和热固性聚苯醚的性能 ,其中包括用环氧树脂、聚丁二烯及其共聚物、氰酸酯、异氰酸酯树脂和烯丙基化合物等改性方法及改性物性能     

国产聚苯醚及其合金的研究进展

介绍了国产聚苯醚（PPO）分子结构性能和加工性能以及应用国产聚苯醚共混得到的聚苯醚／聚苯乙烯合金（PPO／PS）和聚苯醚／尼龙合金（PPO／PA）的技术动向和研究进展，对今后合金的开发进行了展望。     

改性环氧覆铜板高电性能的研究

目的：研究高电性有环氧覆铜板的方法。方法：论述获得高电性能覆铜板途径，分析改性聚苯醚应用于改性环氧得到的覆铜板的性能。结果：用改性聚苯醚改性环氧而得的覆铜板具有优异的电性能。     

侧链含三嗪基团的改性聚苯醚的合成与性能表征

通过分子结构设计,对聚苯醚进行化学改性,合成了以聚苯醚为主体,侧链接枝三嗪基团的新型改性聚苯醚。最终的产物PPO-CzTA是由溴代聚苯醚与含有羟基的三嗪基团发生C-O偶联反应得到的,并对其进行了性能表征。结果显示,通过核磁和红外光谱的分析,确定了PPO-CzTA的结构,并且,接入三嗪单元的聚苯醚显示出了优异的热稳定性,并展现出了良好发光性能。     

聚苯醚改性的研究进展与应用

综述了高抗冲聚苯乙烯、玻璃纤维、苯乙烯-乙烯-丁烯-苯乙烯嵌段共聚物、聚丁二烯、尼龙6、低密度聚乙烯、环氧树脂、氰酸酯等对聚苯醚(PPE)材料的改性.介绍了聚苯醚改性后在电子、汽车、医疗设备、纺织机械等领域的应用.     

改性聚苯醚熔体的流变性能分析

采用Instron-3211型毛细管流变仪对两种牌号的改性聚苯醚材料进行了流变性能测试;以幂率方程为基础,根据测试数据,拟合了熔体黏度与温度、剪切速率之间的定量经验关系式.将这个关系初步用于所述两种改性聚苯醚树脂的共挤出工艺制定中.     

改性聚苯醚的发展及现状

介绍了改性聚苯醚（PPE）的发展历史及PPE/PS、PPE/PA、PPE/SB（SB为苯乙烯系弹性体）、PPE/饱和弹性体合金的性能及应用,阐述了其他合金的情况。最后还介绍了改性聚苯醚的开发方向、技术动态和发展趋势。     

双官能团聚苯醚低聚物的合成与性能研究

采用2种单体共聚,合成了一种新型的改性聚苯醚——双端羟基聚苯醚低聚物(PPE-2OH),利用红外光谱、核磁共振光谱和凝胶渗透色谱确定了结构。结果表明合成的PPE-2OH具有2个活性端羟基,Mn=1469 g·mol-1,M w=2730g·mol-1,Mw/Mn=1.86。PPE-2OH与环氧树脂相容性好,固化后无相分离现象产生。本文还初步探讨了PPE-2OH/EP体系的基本性能。     

聚苯醚系合金的合成与应用进展

介绍了改性聚苯醚的性能，生产工艺、应用与开发前景。     

改性聚苯醚的发展及现状

介绍了改性聚苯醚（PPO）的发展历史和PPO／PS、PPO／PA、PPO／SB和PPO／饱和弹性体合铁性能及应用,简要介绍了改性剂对PPO合金性能的影响、PPO合金的加工工艺和开发方向、技术动态和发展趋势。     

Ultrahigh compressive strength and heat resistance of polystyrene/polyphenylene oxide foams of supercritical carbon dioxide foaming

Polystyrene (PS) foam materials are lightweight, but suffer from poor compressive strength and heat resistance, among other problems, which limit their application. Herein, a method for preparing PS foam with high compressive strength and high heat resistance using supercritical CO₂ is proposed. PS/polyphenylene oxide (PPO) blends were prepared using a corotating intermeshing twin-screw extruder. The results showed that PPO exhibited excellent molecular-level compatibility with PS, which substantially improved mechanical properties and heat resistance of PS. Foam samples of PS/PPO blends with the same expansion ratio were prepared via batch foaming experiments, and the compressive strength of different foams was determined at different temperatures. At room temperature, the compressive strength of the PS/PPO-30% foam increased by 173% compared with pure PS foam. As the testing temperature increased from 30 to 120°C, the compressive strength of pure PS foams decreased rapidly. Nevertheless, PS/PPO foams maintained high compressive strength at high temperatures.     

Thermal and NMR Studies of Polystyrene Blends

Abstract

The effect of addition of poly (propylene oxide) (PPO) and polystyrene with low molecular weight (LPS) to polystyrene (PS) was investigated blending these polymers in a Haake internal mixer. The PPO and LPS range was established up to 10% by weight. The blends were analysed by differential scanning calorimetry (DSC) and carbon-13 nuclear magnetic resonance spectroscopy at solid state (NMR), using conventional NMR techniques as cross-polarisation/magic angle spinning (CP/MAS) and proton spin-lattice relaxation time in the rotating frame (T ₁ ^H _p ). The addition of 1 and 5% of PPO and 5% of LPS to PS made the blends of PS/PPO and PS/LPS more rigid.     

NMR分析聚苯乙烯序列结构

用高分辨率的核磁共振谱仪分析聚苯乙烯(PS)结构的序列分布,对PS碳谱和氢谱进行归属,归属出聚苯乙烯四单元结构序列,得出聚苯乙烯的序列分布在误差允许的范围内遵循伯努利统计。     

Blends of a PPO–PS alloy with a liquid crystalline polymer

Blends of a PPO–PS alloy with a liquid crystalline polymer have been studied for their dynamic properties, rheology, mechanical properties, and morphology. This work is an extension of our previous work on PPO/LCP blends. The addition of the LCP to the PPO–PS alloy resulted in a marked reduction in the viscosity of the blends and increased processibility. The dynamic studies showed that the alloy is immiscible and incompatible with the LCP at all concentrations. The tensile properties of the blends showed a drastic increase with the increase in LCP concentration, thus indicating that the LCP acted as a reinforcing agent. The tensile strength, secant modulus, and impact strength of the PPO–PS/LCP blends were significantly higher than that of PPO/LCP blends. Morphology of the injection molded samples of the PPO–PS/LCP blends showed that the in situ formed fibrous LCP phase was preserved in the solidified form. A distinct skin–core morphology was also seen for the blends, particularly with low LCP concentrations. The improvement of the mechanical properties of the blends is attributed to these in situ fibers of LCP embedded in the PPO–PS matrix. The improvement in the properties of PPO–PS/LCP over PPO/LCP is also attributed to the addition of the PS which consolidates the matrix. © 1995 John Wiley & Sons, Inc.     

On the microhardness testing of electrically stressed poly(phenylene oxide): Polystyrene blends

Microhardness measurements have been performed on untreated (virgin) and electrically stressed, solvent‐cast laboratory‐prepared samples of pure poly(phenylene oxide) (PPO), pure polystyrene (PS), and PPO : PS polyblends with different weight proportions. Results of such measurement on untreated polyblend sample show that microhardness (H_v) increases with increase in the content of PS up to 10 wt %, which attributed to the existence of homogeneous phase morphology. However, this feature is not observable in samples containing higher content of PS. Electrical stress is found to modify considerably the mechanical property of polymer. The effect of electric field on the microhardness of such samples (PPO : PS :: 90 : 10) has been characterized by the existence of a peak. Trapping of charge carriers in electrically stressed samples imparts hardening to the polyblend up to an applied step field of 190 kV/cm. However, the excessive charging beyond this step field value destroys this characteristic. © 2008 Wiley Periodicals, Inc. J Appl Polym Sci, 2008     

PS/PPO合金的燃烧行为研究

利用HAAKE流变仪将聚苯乙(烯PS)与聚苯醚(PPO)进行熔融复合,得到一系列不同组成的聚合物合金。采用热重分析、高温热分解、氧指数、锥形量热分析等方法研究了合金的热稳定性和燃烧性能。结果表明:与纯PS相比,PS/PPO合金的热分解温度提高,成炭量增加,热稳定性显著增强;随着PPO用量的增加,合金的氧指数增大,热释放速率和质量损失速率逐渐减小;在PS树脂基体中加入20phr PPO可使合金的氧指数提高3.4%,热释放速率降低16.4%。研究发现,加入PPO后,聚合物合金在高温下的成炭能力显著增强,生成的炭层覆盖在聚合物材料表面形成保护层,对热量传递、氧气和燃料分子的迁移产生屏蔽和阻隔作用,从而提高了聚合物合金的阻燃性能。     

NMR characterization of intermolecular interactions for polymers,IV. Intermolecular interactions of low molecular weight analogues for compatible blends of polystyrene and poly(2,6-dimethyl-1,4-phenylene oxide)

The intermolecular interaction, IMI, leading to the compatibility of polystyrene, PS, and poly (2,6-dimethyl-1,4-phenylene oxide), PPO, has been identified by analyzing the IMI of the model compounds of low molecular weight; cumene, styrene oligomer, 2,6-dimethyl phenol, and its trimer. The IMI has been detected and identified applying Rummens' method for the analysis of the solvent-induced changes in NMR chemical shifts. The results indicate that the driving force in the formation of the compatible blend of PS and PPO is the π-hydrogen bond between the electrodeficient methyl groups in PPO and π-orbitals in PS. There were no indications that n-hydrogen bonds are formed between ring hydrogens of PS and the oxygen in PPO.     

Characterization of ethylene-1-butene copolymer by differential scanning calorimetry and 13C-NMR spectroscopy

Two kinds of ethylene-1-butene copolymers that were produced by the different procedures, that is, the slurry and the high-pressure polymerizations, were characterized by differential scanning calorimetry (DSC) and carbon-13 nuclear magnetic resonance (¹³C-NMR) spectroscopy. The melting points of both copolymers were found to be different in spite of the same 1-butene content. It was deduced that this phenomenon depended upon the subtly different chain structures between these two copolymers from the tetrad monomer sequence analysis by ¹³C-NMR method. In addition, the behavior of the composition fractionation by temperature rising elution technique was also considered to be affected by the chain structures.     

Surface segregation of components in poly(vinyl chloride)–polydimethylsiloxane and polystyrene–poly(propylene oxide) solvent-cast blends

X-ray photoelectron spectroscopy and scanning electron microscopy are used to study the surface composition and morphology of poly(vinyl chloride)–polydimethylsiloxane (PVC–PDMS) and polystyrene–poly(propylene oxide) (PS–PPO) solvent-cast blends as a function of the blend composition and constituent molecular weights. The PVC–PDMS blends show a pronounced surface enrichment of PDMS, which is higher the lower the molecular weight of PDMS. The surface behavior ofthe PPO–PS blends is strongly dependent on the solvent used. Despite the much lower surface tension of PPO compared to that of PS, no surface segregation of PPO isobserved in the PPO–PS blends cast from tetrahydrofuran, while the blends cast from chloroform exhibit a high surface enrichment of PPO. © 1998 John Wiley & Sons, Inc. J Appl Polym Sci 68: 517–522, 1998