高性能覆铜板用热固性树脂

介绍了高频高性能覆铜板对基材的性能要求,详细讨论了聚苯醚树脂、氰酸酯树脂及聚酰亚胺树脂的特性,并简要介绍了各种树脂基覆铜板的应用情况。通过分析认为:烯丙基化聚苯醚树脂(A PPE)是高频应用的理想材料,为高频高性能电路基板材料首选的树脂基体。     

高频低介电常数改性环氧树脂覆铜板的研制

介绍高频印刷电路板基材的介电性能要求和几种典型的覆铜板材的介电性能，以高溴化环氧树脂（EP），酚醛EP，改性聚苯醚（MPP），酸酐固化剂，咪唑促进剂配制胶粘剂体系，经偶联剂处理的E型无碱玻璃布为增强材料，采用通用上胶与压制工艺，研制了一种适用于高频电路条件下的介电性能优异，成本低的高频覆铜板。     

聚苯醚/环氧树脂体系在覆铜板中的应用

介绍了高性能覆铜板对基材的性能要求、聚苯醚 /环氧树脂体系性能的控制参数及其对体系性能的影响     

PPE/EP体系的介电性能和耐溶剂性研究

利用扫描电镜、差示扫描量热仪以及高频介电仪研究了聚苯醚(PPE)/环氧树脂(EP)体系的相分离、耐热性和介电性能,并利用质量损失法研究了PPE/EP体系的耐溶剂性,结果表明:PPE/EP混合物的耐热性和介电性能均随着PPE含量的增加而提高,而耐溶剂性则随着PPE含量的增加而降低,在PPE/EP体系中加入三烯丙基异氰酸酯(TAIC)可有效地提高PPE/EP体系的耐溶剂性;当PPE含量大于30%时,PPE/EP混合物的介电性能显著提高,耐溶剂性显著下降。     

聚苯醚/环氧体系非等温固化行为及固化工艺

采用程序升温差示扫描量热仪（DSC）法,用Kissinger方程研究了聚苯醚（PPE）/环氧（EP）体系不同配比混合物的固化反应动力学特征。非等温DSC研究表明PPE/EP体系的固化反应过程比较复杂,其动力学参数受PPE含量的影响较大,PPE/EP混合物的固化反应起始温度随PPE含量的增大而增大,最大放热峰的峰温均随着PPE含量的增加而减小。Kissinger法计算得到PPE/EP体系10% PPE、20% PPE、40% PPE含量（质量）的表观活化能依次为63.88、55.37、47.31 kJ·mol^-1, 说明PPE可以促进环氧树脂的固化反应。在此基础上,以20% PPE/EP体系为例,采用T - β 图外推法,得到了其固化工艺     

PPE/EP体系的形态、固化行为和耐热性研究

用等温差示扫描量热法和红外光谱(FT-IR)研究了聚苯醚(PPE)/环氧树脂(EP)体系的固化反应,得出了固化反应程度与反应时间的关系曲线,结果表明在所研究的温度范围内,等温固化温度越高,PPE/EP体系的反应速率越快,最终的反应程度越高.红外的研究结果表明,在180℃固化2 h后,EP不能固化完全,这是由于在固化过程中,伴随着体系的凝胶及EP分子量的逐步增加,引起体系的粘度增大所致.采用扫瞄电子显微镜和综合热分析仪,分别研究了PPE/EP混合物固化材料的形态和耐热性.研究结果表明在PPE/EP体系中加入TAIC(triallylisocyanurate)可有效地提高体系的耐化学药品性,但体系的耐热性也将随着TAIC的加入降低;PPE/EP混合物的耐热性随着PPE含量的增加而提高.     

树脂含量对环氧树脂基覆铜板性能的影响

研究了树脂含量对环氧树脂基覆铜板介电性能、热稳定性和耐湿热性能的影响。结果表明,树脂含量对相对介电常数的影响符合对数混合法规律;树脂含量对覆铜板基材的热稳定性和耐热性能有显著影响,在热分解起始阶段耐热性较优的配方体系失重缓慢进行,树脂含量对热分解起始阶段的影响较显著。随着树脂含量的增加,基材的耐湿热性能先变好后变差,树脂含量为43%时覆铜板基材耐湿热性能最优。     

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。     

PPE/EP共混物的动力学研究

采用差示扫描量热仪对聚苯醚/环氧树脂(PPE/EP)共混物的动力学特征进行了研究,用Kissinger方程和Crane方程计算出了共混物固化反应的表观活化能和反应级数。结果表明:随着PPE含量的增加,PPE/EP共混物的最大放热峰的峰温降低,共混物的反应级数基本不变,而反应的表观活化能明显减小。确定了PPE/EP(20/80)共混物的固化工艺,红外光谱分析表明该固化工艺基本合理。     

环氧树脂基覆铜板耐热老化性研究

利用Arrhenius方程的老化动力学模型研究了环氧树脂基覆铜板的耐热老化性能。研究结果表明,固化体系、阻燃体系以及主体环氧树脂的结构直接影响覆铜板的耐老化性能。酚醛树脂固化体系覆铜板的耐热老化性优于双氰胺固化体系,磷系阻燃的覆铜板耐热老化性优于溴系阻燃体系,配方中添加具有刚性结构的环氧树脂有利于提高覆铜板的耐热老化性。     

Microdispersion of polyphenylene ether in polyphenylene sulfide/polyphenylene ether alloy compatibilized by styrene‐co‐glycidyl methacrylate

The polyphenylene sulfide/polyphenylene ether (PPS/PPE) alloy is desired for use as an engineering plastic. In this case, microdispersion of PPE in the PPS matrix is preferable. We have developed a new method for the preparation of a PPS/PPE alloy that has microdispersed PPE in the PPS matrix. The reactive processing of PPS with PPE gave a PPS/PPE alloy with a microdispersed PPE in the PPS matrix, using styrene‐co‐glycidyl methacrylate copolymer (SG) as a compatibilizer. Although the general properties of the PPS/PPE alloy did not depend on the PPE particle size, tensile strength at the weld part is found to be strongly dependent on PPE particle size. Only the finely dispersed PPE system gave tensile strength at the weld part comparable that of PPS. The PPS/PPE alloy shows superior property to PPS at elevated temperature and, moreover, attains the an advantage of precise molding. © 2002 Wiley Periodicals, Inc. J Appl Polym Sci 86: 3030–3034, 2002     

Mechanical and thermal properties of toughened polypropylene composites

The mechanical, thermal, and structural properties of a new flexible composite containing polypropylene fiber (PP) in a random poly(propylene‐co‐ethylene) (PPE) matrix with ethylene–propylene elastomer (EP) was investigated with emphasis on the effect of EP elastomer concentration. The intrinsic composition of the composites, toughening of the matrix with EP and the fiber–matrix interface determined the properties of the composites. Through the incorporation of EP elastomer into the polypropylene–poly (propylene‐co‐ethylene) (all‐PP) composite, tensile and storage modulus (E′) decreased, flexural modulus and loss modulus (E″, damping) increased slightly to 0.15 EP and then decreased. There was an increase in impact resistance for the toughened composites, with about 100% increase in comparison with an untoughened all‐PP composite. The composition corresponding to 0.20 weight fraction EP gave optimum impact and mechanical properties. Creep resistance of the composite decreased with increasing EP content, but recovery showed an increase with increasing EP content up to 0.20. Fracture surfaces of composites after impact tests were studied with scanning electron microscopy. Moreover, the use and limitation of theoretical equations to predict the tensile and flexural modulus of the flexible PP composite is discussed. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci 2007     

Preparation of poly(2,6-dimethyl-1,4-phenylene ether) (PPE)/epoxy laminate with functionalized PPE resin

Thermal expansion property at 288°C and methylene chloride resistance of poly(2,6-dimethyl-1,4-phenylene ether (PPE)/epoxy laminate were found to be affected by the functionality on PPE resin. Nonlofting PPE/epoxy laminates were prepared with the PPE grafted with fumaric acid or the PPE having (di-n-butylamino) methyl substituent on the polymer backbone. Employing vacuum-vented PPE extrudate or phenol-redistributed PPE was also effective in improving the PPE/epoxy laminate properties. Attempts to preparing a real PPE/epoxy interpenetrating network as the matrix material for the laminate were also made by incorporating both PPE crosslinker and epoxy curing catalysts in the same formulation. © 1993 John Wiley & Sons, Inc.     

Dispersion of Poly(phenylene ether) in a Poly(phenylene sulfide)/Poly(phenylene ether) Alloy

We have devised and developed a new method for the preparation of a poly(phenylene sulfide)/poly(phenylene ether) (PPS/PPE) alloy, which has micro‐dispersed PPE in the PPS matrix. PPS was chemically treated to activate the reactivity of the PPS end‐group by extrusion in the presence of diphenylmethane diisocyanate (MDI) in its molten state at 300°C. The reactive processing of the MDI‐treated PPS with maleic anhydride‐modified PPE gave a PPS/PPE alloy with micro‐dispersed PPE in the PPS matrix. The PPS/PPE alloy showed mechanical properties superior to those of PPS at elevated temperature (150°C) and also showed precision‐molding ability superior to that of PPS.     

Controllable Synthesis of Submicrometer Core–Shell Modifier and Its Effect on Toughening Polypheylene Ether/Polystyrene Blends

Core–shell polybutadiene-graft-polystyrene (PB-g-PS) graft copolymers with different ratios of PB to PS are synthesized by emulsion polymerization. Further, the PB-g-PS copolymers are blended with polypheylene ether (PPE) and PS to prepare PPE/PS/PB-g-PS blends. The effects of PB-g-PS copolymer structure and matrix composition on the morphological, mechanical properties, and deformation mechanism of the blends are studied. The results show that the synthesized submicrometer-sized PB-g-PS copolymer has an excellent toughening efficiency, both the copolymer and PS are introduced into PPE resin to produce a ternary blend which is combined with high toughness and processing properties. The optimum toughening effect on PPE/PS matrix is observed at the core–shell weight ratio of 70/30 in PB-g-PS copolymer, and the impact strength of the blends increased from 101 to 550 J m⁻¹. In addition, the dispersion pattern of rubber particles in the matrix gradually changes from uniform dispersion to aggregation as the core–shell ratio of PB-g-PS copolymers increases. On the other hand, with the increase of PPE content, the dispersion of rubber particles in PPE/PS matrix is improved, and the deformation mechanism is changed from cracking to a combination of crazing and shear yielding, which can lead to absorb more energy to achieve better toughness.     

MQ硅树脂/纳米TiO_2复合改性环氧树脂的结构与性能

以环氧树脂(EP)为基体树脂,以MQ硅树脂和纳米TiO_2(nano-TiO_2)同时作为EP的增韧改性剂,由此制备了nano-TiO_2/MQ硅树脂/EP复合材料。研究结果表明:MQ硅树脂已成功接枝在EP分子链上;当m(MQ硅树脂):m(nano-TiO_2):m(EP)=15:3:100时,nano-TiO_2/MQ硅树脂/EP复合体系的耐热性能明显提高,拉伸强度和冲击强度分别提高了66.6%和68.1%,其断面呈韧性断裂特征。     

聚苯醚在覆铜板行业中的应用

介绍了在覆铜板行业中用作胶粘剂的聚苯醚树脂的改性方法及其特性，以及用其制得的覆铜板的性能和国内外发展的概况。