改性聚苯醚(MPPO)工程塑料国内外发展现状

综述了聚苯醚、共混改性聚苯醚、相容剂改性聚苯醚、热固性聚苯醚和阻燃聚苯醚工程塑料的国内外进展。介绍了其在工程塑料领域的消费量和消费分布以及在覆铜板中的应用。     

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。     

热固性聚苯醚树脂在高频印制电路板上的应用

介绍了高频印制电路板基材的介电性能要求和热固性聚苯醚树脂基材的制备 ,详细讨论了制备热固性聚苯醚树脂的两条技术路线及其树脂体系的特性 ,以及热固性聚苯醚树脂基覆铜板的特性 ,并简要介绍了热固性聚苯醚树脂基覆铜板的应用情况。     

13C-NMR分析技术在改性聚苯醚剖析中的应用

应用^13C核磁共振分析技术，参照Sadtler标准^13C核磁共振谱图，对国外公司的五种改性聚苯醚样品进行了剖析。结果表明，有两种改性聚苯醚样品系由聚苯醚、聚苯乙烯和磷酸三苯酯组成，该类材料具有优良的阻燃性能；有两种系由聚苯醚、聚苯乙烯和聚顺丁二烯共混而成，具有较强的冲击性能；有一种系由聚苯醚、聚苯乙烯和聚乙烯构成，具有突出的润滑性能和耐磨性能。     

SABIC展示了NorylSA树脂作为环氧树脂和非环氧热固性塑料添加剂

美国SABIC公司推出了全新系列的No州树脂,可作为添加剂用于环氧树脂或非环氧树脂的热固性体系。电子工业的快速发展给制造商带来了严峻挑战,既要求扩展热固性材料性能,又不能增加材料成本。SABIC的NorylSA树脂提供了一个近乎完美的解决方案,它兼容了几个客户的现有技术和供应链,并在性能和可持续性上取的重大改进。NorylSA90和SA9000树脂可用于铜覆层压板．电气粘合剂,复合材料和涂料,用来提高现有热固性产品的性能和可持续性,而不使用更昂贵的材料。研究人员通过对高分子量的NorylPPO聚苯醚树脂的改性．获得一种低分子量、低介电常数和损耗因子的双官能低聚物,提高了韧性并具有较高的热稳定性。     

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。     

氰酸酯树脂增韧改性研究

综述了采用热固性树脂(环氧树脂,双马来酰亚胺)、热塑性树脂(聚醚砜,聚苯醚)、橡胶弹性体(端羧基丁腈橡胶,端环氧基丁腈橡胶)、无机纳米粒子(SiO2,SiC)增韧改性氰酸酯树脂的机理及研究进展,并指出了今后氰酸酯树脂改性研究的发展方向。     

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。     

α,ω-双(2,6-二甲基羟苯基)聚苯醚树脂

论述了α,ω-双(2,6-二甲基羟苯基)-聚(2,6-二甲基-1,4-酚氧)(PPO-2OH)型聚苯醚的通用及新型合成方法。这些方法是以2,6-二甲基苯酚通过铜铵络合催化的氧化聚合为基础。通过合成方法的改性可以得到低分子质量双端羟基聚苯醚(PPO-2OH)。概述了各种合成PPO-2OH的方法,例如2,6-二甲基苯酚(DMP)同四甲基双酚A(TMBPA)氧化共聚;单官能团PPO和3,3,5,5-四甲基联苯二醌(TMDPQ)反应;单官能团PPO同甲醛缩合反应,论述了PPO-2OH的改性方法,如引入烯丙基基团,同其他热固性树脂共混改性和互穿聚合物网络如环氧树脂等。还介绍了此种分子质量端羟基聚苯醚的工业应用。     

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.     

Synthesis and Properties of Thermosetting Modified Polyphenylene Ether

Summary A novel method for preparing thermosetting modified Poly(2,6-dimethyl-1,4-phenylene ether) (PPE) was developed by introducing allyl groups into PPE. It was successfully prepared from the reaction between brominated PPE and a Grignand reagent. The effects of substitution of bromine on methyl group and dosage of allylated Grignard reagent on the substitution value of allyl group were studied. The structure of the resulting allylated PPE (A-PPE) was characterized by ¹H-NMR and FT-IR spectroscopy. The curing reaction process was researched by differential scanning calorimetry (DSC), and the properties of the cured A-PPE were also investigated. The curing reaction of the A-PPE was first order reaction. The curing reaction activation energy obtained by Kissinger equation was 121.7 kJ/mol. The cured A-PPE resin is excellent not only in solvent resistance and dielectric properties, but also in thermal properties, moisture absorption and adhesion with glass fiber. The dielectric constant (ε) and dissipation factor (tan δ) of A-PPE composites reinforced with E-glass cloth at 1 MHz were measured as 2.84 and 2.65×10^-3, respectively. In addition, A-PPE was very easy to form into films.     

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。     

聚苯醚与尼龙6共混物的增容改性

以PPE／PA6共混物为基体,进行性能与结构的表征,对比了不同PPE／PA6比例的共混物性能以及添加增容改性树脂、增韧剂的使用效果。结果表明,增容改性树脂可使得PPE树脂粒子变得均匀,在提高共混材料的韧性的同时,改善了材料的拉伸性能;而弹性体虽可以提高PPE与PA6的共混物的冲击性能,但拉伸性能下降;添加5％增容改性树脂有助于改善玻纤增强PPE／PA6材料的力学性能。     

烯丙基化合物改性双马来酰亚胺树脂的研究进展

双马来酰亚胺(BMI)树脂以其优异的机械和热稳定性能广泛用于航空航天等领域,但纯BMI熔点高、韧性和溶解性差,不能满足实际使用要求,必须对其进行改性。探讨了烯丙基化合物改性BMI的反应机理,包括"Ene"反应、Diels-Alder反应以及体系中可能存在的其他反应;并分别概述了二烯丙基双酚A(DABPA)、含硼烯丙基化合物、烯丙基酚醛树脂、烯丙基酚氧树脂及其他烯丙基化合物改性BMI体系的研究进展和改性效果。     

基于专利数据的聚苯醚产业分析

基于聚苯醚(PPE)专利数据,从专利申请的时间分布、地区分布、主要申请人、技术构成等角度详细剖析了PPE专利技术的整体发展态势.研究表明,PPE产业的发展重点在于PPE的合戍和改性PPE,美、日、德三国全面垄断了从PPE合成到PPE改性的关键技术,在各个方面形成技术壁垒.建议国内企业和研究机构形成产业合力,尽快实现PP...     

雷达罩用高性能氰酸酯树脂制备及性能

采用马来酸酐(MAH)改性低分子量聚苯醚(PPE),通过熔融共混法将改性聚苯醚(MAH–PPE)与氰酸酯(CE)树脂进行共混,分析研究MAH–PPE添加量对CE体系热性能、力学性能和介电性能的影响。研究结果表明,MAH–PPE对CE树脂的固化具有明显催化作用,动态热机械和热重分析表明,加入MAH–PPE对CE的耐热性影响不大,随着MAH–PPE添加量的增加,CE体系的玻璃化转变温度和最大热分解温度与纯CE相比基本保持不变。扫描电子显微镜分析表明,当MAH–PPE质量分数低于10%时,MAH–PPE与CE具有良好的界面作用,表现出典型的韧性断裂,随着MAH–PPE添加量的增加,CE/MAH–PPE体系呈现微观相分离。冲击强度测试结果表明,当MAH–PPE质量分数为10%时,CE/MAH–PPE体系的冲击强度达到43.36 kJ/m2,比纯CE提高140.9%,增韧效果达到最佳。介电性能测试结果表明,随着MAH–PPE质量分数的增加,CE/MAH–PPE体系呈现出较好的介电性能,当MAH–PPE质量分数为30%时,CE/MAH–PPE体系在10 GHz下的介电常数和介电损耗角正切值分别为2.84和9.35‰,比纯CE分别降低7.5%和30.8%。     

高性能覆铜板用聚苯醚/环氧树脂体系

简要介绍了高性能覆铜板对基材的性能要求及聚苯醚和环氧树脂分别作为覆铜板基材的优缺点;PPE/EP是具有最高上临界温度的体系,详细讨论了PPE的分子量和用量、相容剂以及改性PPE对PPE/EP体系相容性的影响。采用PPE/EP体系制得的覆铜板(如RG-200)比传统的FR-4覆铜板的介电性能和耐热性能均有大幅度的提高。     

Antifoaming performance of polysiloxanes modified with fluoroalkyls and polyethers

A series of polysiloxanes modified with fluoroalkyls and polyethers were synthesized. Antifoaming performance of such modified polysiloxanes in the mixture of diesel and mobile fuel was studied. The effects of factors such as polyethers type, molar ratio between polyether and fluoroalkyl, hydrogen‐contents and viscosity of polysiloxanes, length of fluoroalkyls, etc., on the performance of modified products were discussed. It shows that polysiloxane modified with allyl polyoxypropylene ether and hexafluorobutyl acrylate has better breaking and inhibiting foam performance, when compared with that replacing allyl polyoxypropylene ether with allyl polyoxyethylene polyoxypropylene block ether and allyl polyoxyethylene ether. And when the molar ratio between allyl polyoxypropylene ether and hexafluorobutyl acrylate is 3 : 7, modified polysloxane has the best foam controlling performance. Low viscosity polysiloxane or low hydrogen content polysiloxane modified with allyl polyoxypropylene ether and hexafluorobutyl acrylate has better foam controlling performance. Polysiloxane modified with longer carbon chain fluoroalkyl and allyl polyoxypropylene ether has better antifoaming performance than that modified with shorter carbon chain fluoroalkyl and polyether and lower surface tension. The change of surface tension of foaming liquid between initially added with modified polysiloxane and after testing antifoaming performance was studied, and it shows that after testing performance of antifoam, the surface tension of foaming liquid becomes bigger which is one possible reason for antifoam exhausting. © 2008 Wiley Periodicals, Inc. J Appl Polym Sci, 2008     

Flexible and flame‐retardant S‐SEB‐S triblock copolymer/PPE nano‐alloy

We observed that modified polyphenylene ether (PPE) was solubilized in thermoplastic styrenic elastomer (TPS) and that a two‐phase lacy structure formed on nanometer scales when the TPS composition was 67 wt % and modified PPE and polystyrene‐block‐poly(styrene‐co‐ethylene‐co‐butylene)‐block‐polystyrene (S‐SEB‐S triblock copolymer) were blended. However, the molecular weight of the outer PS block segments M_outPS and the content of the outer PS block segments ?_outPS were <10,000 g/mol and 20 wt %, respectively. The resulting S‐SEB‐S/modified PPE nano‐alloy exhibited both flexibility and flame retardancy, unlike other materials, where a trade‐off exists between these two properties; that is, the flame retardancy was excellent when the phosphorus additive was present. This combination of properties might be attributed to the two‐phase nanometer‐scale structure consisting of flame‐retardant styrene/PPE domains and a continuous soft, lacy SEB matrix. The results for polystyrene‐block‐poly(ethylene‐co‐butylene)‐block‐polystyrene (S‐EB‐S triblock copolymer)/modified PPE blends were presented for comparison. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014 , 131, 40446.     

Natural compounds from Punica granatum peel as multiple stabilizers for polyethylene

Punica granatum peel extractive (PPE), a novel stabilizer of polyethylene, is investigated in this study. Oxidation onset temperature (OOT), carbonyl index (CI), melt flow rate (MFR), tensile strength, and elongation at break are used to characterize the effects of PPE, which are also compared with commercial antioxidant (Irganox 1010) with the presence of tetrakis (2,4-di-tert-butylphenol)[1,1-biphenyl]-4,4′-diylbisphosphite (PEPQ). Long-term and short-term aging results show that samples modified by PPE or Irganox 1010 (PE-PPE_0.12%-P and PE-1010_0.12%-P samples) have comparable CI value and stability of OOT. However, compared with PE-PPE_0.12%-P sample, much higher CI and larger change of MFR is detected for PE-1010_0.12%-P after UV irradiation and five extrusions. It suggests that PPE is better protector for PE against UV light and mechanical shear force. All results indicate that the effect of PPE in protecting PE is comparable or much better than Irganox 1010 and it can be used as multiple stabilizers for PE. Moreover, the stabilities of PE modified with PPE alone (PE-PPE_2%) is also investigated. Results show that PE-PPE_2% sample has good thermo-oxidative, UV and processing stabilities. All results reveal that PPE is a good candidate of PE stabilizer and it could avoid the usage of PEPQ in protecting PE.