聚苯醚共混体系的研究进展

根据近几年国内外聚苯醚共混体系的研究情况,介绍聚苯醚与聚苯乙烯、聚酰胺、聚酯、热塑性弹性体等热塑性树脂及环氧树脂等热固性树脂共混体系的研究进展,并对聚苯醚共混体系的发展前景进行了展望。     

热塑性树脂增韧环氧树脂研究进展

介绍了热塑性树脂/环氧树脂共混体系的的制备方法,相分离机理以及相结构的影响因素,综述了国内外热塑性树脂增韧环氧树脂的研究进展。并对其增韧机理进行了论述。     

聚醚砜/环氧树脂共混体系流变特性与固化性能的研究

环氧树脂是一种性能优良的热固性树脂,但是存在抗冲击性能差的缺点。聚醚砜(PES)是一种高性能热塑性树脂,与环氧树脂共混能够改善环氧树脂的韧性。系统研究了不同PES含量的PES/环氧树脂共混体系的流变特性和固化性能。通过对等温粘度曲线的数据拟合分析,建立了粘度模型,分析了PES对PES/环氧树脂共混体系粘度的影响机理,并通过DSC测试研究了PES对共混体系固化性能的影响。结果表明,PES在环氧树脂中的溶解过程可以引起共混体系粘度的波动,PES的引入缩短了PES/环氧树脂共混体系的凝胶时间,而且PES中的羟基对环氧树脂的固化具有促进作用。     

氰酸酯树脂及其胶粘剂

介绍了高性能氰酸酯树脂的品种、主要性能、商业产品和氰酸酯树脂固化反应的原理和特点;评述了氰酸酯树脂与环氧树脂、双马来酰亚胺树脂和热塑性树脂共混体系的物理－机械性能。     

聚芳醚酮改性环氧树脂基复合材料的热稳定性

采用热塑性树脂酚酞型聚芳醚酮改性环氧树脂共混体系,并对其化学结构组成、断面微观形貌及热稳定性进行分析。结果表明,当聚芳醚酮含量较高时,环氧树脂共混体系存在排列紧密、彼此相连的均匀球形分散相,为PAEK树脂包覆球状热固性树脂的相结构。在应力的作用下,这种球粒相结构可以起到吸收能量、阻碍裂纹扩展的作用,从而提高了断裂能,使材料的断裂韧性得到提高。而且,随着热塑性PAEK树脂质量分数的增加,球状的富环氧颗粒逐渐减小。随着PAEK树脂的含量的增加,PAEK/EP共混体系的耐热性能呈先增大后减小的趋势。当PAEK树脂的含量为40份时,PAEK/EP共混体系的T_HRI达到最大值。     

动态固化聚丙烯／环氧树脂共混物的制备工艺研究

将动态硫化技术应用于热塑性树脂／热固性树脂体系，制备了动态固化聚丙烯／环氧树脂共混物，研究了动态固化PP／环氧树脂共混物制备工艺条件即增容剂、固化剂、环氧树脂的环氧当量及其含量等因素对共混物力学性能的影响。实验结果表明，选择马来酸酐接枝的均聚聚丙烯(PP-g-MAH)作为增容剂，所制得的动态固化PP／环氧树脂共混物的力学性能较好。2-乙基-4-甲基咪唑(EMI-2，4)的适宜用量为1．2％(每100份环氧树脂使用4份)。环氧当量对共混物的性能影响不大。当环氧树脂的含量为5％～10％时，动态固化PP／环氧树脂共混物的综合性能明显好于PP，特别是具有较高的强度和模量。     

聚合物包覆的纳米聚硅微粒及其制备方法

由中国石油天然气股份有限公司申请的专利（专利号 CN1673275，公开日期2005-09—28）“低光泽易加工热塑性树脂共混物及挤出加工方法”，涉及的低光泽易加工热塑性树脂共混物配方为：氯乙烯聚合物10～80，     

酚醛树脂与热塑性树脂的共混研究进展

综述了酚醛树脂与热塑性树脂共混研究的最新进展.介绍了热塑性树脂增韧酚醛树脂的相容性和相行为.酚醛树脂改性热塑性树脂,提高热塑性树脂的力学性能和阻燃性,以及利用酚醛树脂的活性基团改善不相容热塑性树脂共混体系的相容性的研究进展.     

RTM专用混合型树脂体系研究——反应特性与工艺特性研究

本文采用乙烯基酯树脂和环氧树脂体系共混改性的方法。研究和开发具有良好工艺性、耐热性和力学性能的低成本ＲＴＭ用树脂体系。研究表明，乙烯基酯树脂和环氧树脂体系具有良好的共混特性。ＤＳＣ及粘度分析研究表明，混合型树脂体系中的乙烯基酯组份分散了环氧树脂的反应放热，有效降低了７１１环氧树脂的反应速度和改善了树脂的工艺特性。使混合型树脂具有较好的ＲＴＭ工艺低粘度平台工艺性能。所研究的混合型树脂体系可用于ＲＴＭ     

聚氯乙烯类热塑性弹性体的研究概况

从高聚合度聚氯乙烯 (HPVC)树脂、PVC交联、与弹性体共混三方面讲述了聚氯乙烯类热塑性弹性体的加工方法 ,并对不相容PVC共混体系的增容进行了介绍。     

热塑性工程塑料对环氧树脂增韧改性研究

本文综述了近期热塑性工程塑料改性环氧树脂的工作及所取得的成果，并且介绍了在结构分析、改性机理等方面的研究工作。     

环氧树脂改性研究进展

综述了改性环氧树脂的最新研究状况,概述了橡胶弹性体、热塑性树脂、互穿网络聚合物、刚性粒子及核壳结构聚合物对环氧树脂的增韧改性以及对环氧树脂阻燃性、绝缘性的改性,并对环氧树脂改性的新方法进行了展望。     

端脂肪氨基聚醚改性环氧树脂的性能研究

用自制的一种既含聚醚柔性链段又含苯脂肪氨基刚性链段的端脂肪氨基聚醚(APPEG)作为固化剂对环氧树脂进行增韧改性。扫描电子显微镜和力学性能测试结果表明,固化剂对环氧树脂具有明显的增强、增韧效果,且改性的环氧树脂胶粘剂具有很好的填充性能,填充比高达50%。与羰基铁粉组成的涂层材料具有优异的力学性能和热稳定性能。     

Epoxy modification with poly(vinyl acetate) and poly(vinyl butyral). I. Structure,thermal, and mechanical characteristics

Efficiency of the application of high strength heat resistant thermoplastics for improving fracture toughness and impact properties of epoxy resins motivated authors to try large‐scale production thermoplastics for the same purpose. Epoxy/anhydride systems were modified by up to 8 wt % poly(vinyl acetate) (PVAc) and up to 6 wt % poly(vinyl butyral) (PVB). In epoxy–PVAc blends it was possible to obtain morphologies with continuous thermoplastic phase. However, only sea‐island morphologies with a very small size of PVB‐rich phase were observed in epoxy–PVB matrices. The former type of morphology allowed a notable 2.4‐fold increase in the fracture toughness of epoxy resin and simultaneous up to 30% decrease in its' impact strength. The latter type of morphology caused a notably lower (45%) enhancement of the epoxy fracture toughness combined with a 50% increase in its' impact strength. © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016 , 133, 44081.     

Modification of epoxy resins by the addition of PVC plastisols

An epoxy resin based on bisphenol A has been modified by the addition of different amounts of a plastisol, based on poly(vinyl chloride) (PVC) and diethylhexyl phthalate (DOP). The fluid state of those materials makes their blending easier. After a curing process, some different materials, with properties ranging from the rigidity of a thermosetting resin to the flexibility of a plastisol, can be obtained. The variation of different parameters, such as tensile strength, Young's modulus, dielectric constant, and others, with the concentration of plastisol, has been studied. Some materials with properties similar to common thermoplastics (PP, ABS, or SB) can be processed, depending on the epoxy-to-plastisol ratio. The obtained results enable us the use of those materials in prototyping and other industrial processes. The obtained prototypes should have a similar mechanical behavior to thermoplastics. © 1998 John Wiley & Sons, Inc. J Appl Polym Sci 67:1769–1777, 1998     

1992～1993年国外塑料工业进展

介绍1992～1993年国外塑料工业进展.提供了美国、日本、原联邦德国、原苏联、法国、意大利、英国等生产国及亚洲、西欧(全部共同市场国家加奥地利、芬兰、挪威、瑞士和瑞典)、东欧、北美、中南美、非洲和大洋洲等地域的塑料材料产量.按通用热塑性树脂(包括聚乙烯、聚丙烯、聚苯乙烯,ABS和聚氯乙烯)、工程塑料(包括尼龙、聚碳酸酯、热塑性聚酯、聚甲醛和改性PPO/PPE)、热固性树脂(包括酚醛、聚氨酯、不饱和聚酯和环氧树脂)、特种工程塑料(包括聚苯硫醚、液晶聚合物、聚醚巩、聚醚醚团和聚芳酯)和其他(包括氟树脂、硅树脂和丙烯酸树脂)等,对塑料材料产量和消费、合成工艺、产品应用开发、树脂品种延伸等进展作了详细介绍.     

Toughening of aromatic diamine-cured epoxy resins by poly(butylene phthalate)s and the related copolyesters

Aromatic polyesters, prepared by the reaction of aromatic dicarboxylic acids and 1,4-butanediol, were used to improve the toughness of bisphenol-A diglycidyl ether epoxy resin cured with p,p′-diaminodiphenyl sulfone. These polyesters contained poly(butylene phthalate)s (PBP), poly(butylene phthalate-co-butylene isophthalate)s, poly(butylene phthalate-co-butylene terephthalate)s, and poly(butylene phthalate-co-butylene 2,6-naphthalene dicarboxylate)s. All aromatic polyesters used in this study were soluble in the epoxy resin without solvents and were found to be effective as modifiers for toughening the cured epoxy resin. For example, the inclusion of 20 wt % PBP (MW 16,300) led to a 120% increase in the fracture toughness (K_IC) of the cured resin with no loss of mechanical and thermal properties. The toughening mechanism was discussed in terms of the morphological and dynamic viscoelastic behaviors of the modified epoxy resin system. © 1996 John Wiley & Sons, Inc.     

聚甲基苯基硅氧烷改性环氧树脂

用羟基封端的聚甲基苯基硅氧烷(PMPS),经脱水缩合反应,对双酚A型环氧树脂进行改性,得到一种相容性好、内应力低的新型耐热环氧树脂。探讨了PMPS与环氧树脂间脱水缩合反应的机理,并用羟值、环氧值分析以及薄层色谱法(TLC)、红外光谱(IR)、透射电镜(TEM)、扫描电镜(SEM)、差热分析法(DTA)和热重法(TG)等对改性树脂进行分析及表征。     

Surface Modification of Epoxy Resin with Silicone-containing Block Copolymers

In order to improve oil and water repellency, silicone-containing block copolymers, composed of methylmethacrylate (MMA), glycidylmethacrylate (GMA), and polydimethylsiloxanemethacrylate (SMA), were blended in an epoxy resin. It was expected that the low surface energy dimethylsiloxane segments would adsorb and orient at the exterior of the resin to make a thin surface phase and the glycidyl groups would mesh with the epoxy resin by primary bonding. The techniques of X-ray photoelectron spectroscopy (ESCA), dynamic contact angle (DCA) and peel strength measurements of pressure sensitive adhesives were used to characterize the modified epoxy resin surface phases. The amount of Si_2p obtained via angular dependent ESCA investigation in the near surface region of the modified resin increased with decreasing sampling depth. With an increase in modifier content, both the amount of Si_2p and O_1s also increased. Both advancing and receding contact angles for an aluminum plate coated with modified resin, measured by dipping into and out of water, increased with the addition of these modifiers. The peel strength of a pressure sensitive adhesive tape affixed to the modified epoxy resin decreased dramatically with increasing modifier content. It was found that these copolymers were good surface modifiers to improve oil and water repellency and that they acted as release agents.     

Toughening of epoxy resins by hydroxy‐terminated,silicon‐modified polyurethane oligomers

Epoxy resins are among the most versatile engineering structural materials. A wide variety of epoxy resins are commercially available, but most are brittle. Several approaches have been used to improve the toughness of epoxy resins, including the addition of fillers, rubber particles, thermoplastics, and their hybrids, as well as interpenetrating polymer networks (IPNs) of acrylic, polyurethane, and flexibilizers such as polyols. This last approach has not received much attention; none of them have been able to suitably increase resin toughness with out sacrificing tensile properties. Therefore, in an attempt to fill this gap, we experimented with newly synthesized hydroxy‐terminated silicon‐modified polyurethane (SiMPU) oligomers as toughening agents for epoxy resins. SiMPU oligomers were synthesized from dimethyl dichlorosilane, poly(ethylene glycol) (weight‐average molecular weight ～ 200), and toluene 2,4‐diisocyanate and characterized with IR, ¹H‐NMR and ¹³C‐NMR, and gel permeation chromatography. The synthesized SiMPU oligomers, with different concentrations, formed IPNs within the epoxy resins (diglycidyl ether of bisphenol A). The resultant IPN products were cured with diaminodiphenyl sulfone, diaminodiphenyl ether, and a Ciba–Geigy hardener under various curing conditions. Various mechanical properties, including the lap‐shear, peel, and impact strength, were evaluated. The results showed that 15 phr SiMPU led to better impact strength of epoxy resins than the others without the deterioration of the tensile properties. The impact strength increased continuously and reached a maximum value (five times greater than that of the virgin resin) at a critical modifier concentration (20 phr). The critical stress intensity factor reached 3.0 MPa m^1/2 (it was only 0.95 MPa m^1/2 for the virgin resin). © 2003 Wiley Periodicals, Inc. J Appl Polym Sci 90: 1497–1506, 2003