双酚A苯并恶嗪一环氧树脂基印制电路基板的研究

采用双酚A苯并恶嗪与环氧树脂共混改性制得胶液,经浸渍玻璃布、烘焙、压制得到了一系列玻璃布覆铜板基板其中含溴型基板的玻璃化转变温度为145.2℃,加强耐热性在300s以上,常温下表面电阻率和体积电阻率分别为1.51×1014Ω、5 75×1014Ω@m,无溴型基板玻璃化转变温度为160.3 ℃,加强耐热性在300 s以上.常温下表面电阻率和体积电阻率分别为1.91×1013Ω、5.01×1013Ω@m,覆铜板的耐浸焊性能优异,达到60s以上     

Preparation and application of polybenzoxazine adsorption resin

The synthesis and application of polybenzoxazine adsorption resin was studied. First, the precursor was synthesized by the solventless method. And then a kind of spherical and granular polybenzoxazine resin was obtained using reverse‐phase suspension polymerization technique in the process of solidification. Besides, the influence of dispersion medium, the volume ratio of precursor to medium, the solidification temperature, and the agitation speed were studied in detail in the process of polymerization. Second, the spherical shape of the polybenzoxazine resin was identified by scanning electronic microscope and the thermal stability of resin was measured by thermogravimetric analysis. Finally, the adsorption capacity of the spherical resin on pyridine was studied in cyclohexane systems. The correlation coefficient of Langmuir adsorption constant temperature line was bigger than 0.99, which indicated that the equilibrium sorption date was coincident with the Langmuir isotherm equation. And the saturated adsorptive capacity of dried resin achieved 222.2 mg g^?1. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci, 2007     

The kinetics of B‐a and P‐a type copolybenzoxazine via the ring opening process

The structure of benzoxazines is similar to that of phenolic resin through thermal self‐curing of the heterocyclic ring opening reaction that neither requires catalyst nor releases any condensation byproduct. These polybenzoxazine resins have several outstanding properties such as high thermal stability and high glass transition temperature. To better understand the curing kinetics of this copolybenzoxazine thermosetting resin, dynamic and isothermal differential scanning calorimetry measurements were performed. Three models, the Kissinger method, the Flynn–Wall–Osawa method, and the Kamal method, were used to describe the curing process. Dynamic kinetic activation energies based on Kissinger and Flynn–Wall–Osawa methods are 72.11 and 84.06 KJ/mol, respectively. The Kamal method based on an autocatalytic model results in a total order of reaction between 2.66 and 3.03, depending on curing temperature. Its activation energy and Arrhenius preexponential are 50.3 KJ/mol and 7959, respectively. © 2004 Wiley Periodicals, Inc. J Appl Polym Sci 95: 730–737, 2005     

Side-chain type benzoxazine-functional cellulose via click chemistry

A side-chain type benzoxazine-functional cellulose has been developed using click chemistry via the reaction of ethynyl-monofunctional benzoxazine monomer and azide-functional cellulose. The synthesis, crosslinking, and thermal properties of the benzoxazine-functional cellulose are studied by NMR, FTIR, DSC, and TGA. The crosslinking reaction of the benzoxazine side-chain unusually takes place at low-temperatures in comparison to an ordinary benzoxazine resins. Upon crosslinking, the polymer shows high char yield of 40%, which is a marked improvement from a mere 4% of the unfunctionalized cellulose. © 2012 Wiley Periodicals, Inc. J Appl Polym Sci, 2012     

双酚S型苯并恶嗪改性酚醛树脂模塑料的性能研究

以双酚S为原料,采用溶剂法合成了一种含砜基的苯并恶嗪(BOZ–S),并用不同长度的高性能维纶短切纤维(PVAF)为增强材料,通过预浸料模压成型制备出BOZ–S改性酚醛树脂(PF)模塑料。利用傅里叶变换红外光谱仪、核磁共振仪、差示扫描量热仪以及扫描电子显微镜等分别对BOZ–S的单体结构、PF/BOZ–S改性体系的固化特性、改性PF模塑料的力学性能、热性能以及冲击断口进行了分析研究。结果表明,成功合成出了预期结构的BOZ–S,且固化时存在两种放热反应;改性树脂体系的各项性能与纯PF相比均有明显提升,且纤维的长度越长,模塑料的力学性能提升越大,其中PF/BOZ–S质量比为80/20、纤维长度为36 mm时,体系的综合性能最佳,冲击强度和弯曲强度分别为88.4 k J/m~2和175.9 MPa,弯曲弹性模量达到8.8 GPa,马丁耐热温度为164.3℃。     

苯并噁嗪/钛酸钡复合材料介电性能的研究

通过共混法制备了苯并噁嗪/钛酸钡复合材料,探讨了钛酸钡粒径和填充量对复合材料介电性的影响。当?(BaTiO3)=50%时,复合材料介电常数εr达54、介质损耗tanδ为0.027、体积电阻率ρv大于1011?·m、击穿电压Vb大于8×103V/mm的高εr低tanδ绝缘材料。并将其应用于制备内嵌式电容器用玻璃布复合层压板。     

苯并噁嗪树脂的合成及在形状记忆聚合物中的应用研究进展

苯并噁嗪树脂作为一类新型的热固性树脂,具有分子设计性强、阻燃性能和耐腐蚀性能优异、固化时不需要强酸、无小分子放出等优点,在航空、建筑、电子等领域获得了广泛应用。本文主要介绍了苯并噁嗪单体的合成方法（溶剂法、无溶剂法和悬浮法）、降低苯并噁嗪开环聚合温度的方法（合成具有特殊基团的苯并噁嗪单体、添加催化剂）及苯并噁嗪树脂在形状记忆聚合物中的应用（与其他聚合物混合,纯苯并噁嗪化学改性）,对苯并噁嗪形状记忆聚合物目前存在的问题进行了概述并对苯并噁嗪形状记忆聚合物的发展前景做出了展望。     

酚酞乙二胺型苯并噁嗪树脂的合成与性能研究

用酚酞、乙二胺和甲醛为原料,通过缩聚反应制备了酚酞乙二胺型苯并噁嗪聚合物（PTBZO）,并通过热聚合法制备了酚酞乙二胺型苯并噁嗪树脂（PPTBZO）。采用1H-NMR对聚合物及树脂的结构进行了表征。借助TG-DTG技术,运用模型拟合法和非模型拟合法研究了PPTBZO的热分解行为及热分解机理,并测试了其介电性能。结果表明,在低失重率（10~50%）下,PPTBZO分解主要是Mannich桥键的断裂,分解过程符合随机成核和随后生长机理;酚酞基团的引入极大地提高了树脂的热稳定性;树脂的复介电常数实部和虚部分别为2.65和0.05,介电损耗角正切值在0.02~0.14,具有良好的介电性能。     

氰酸酯环氧双马来酰亚胺基胶粘剂的苯并噁嗪改性研究

以苯并噁嗪(BZ)作为氰酸酯(CE)-环氧树脂(EP)-双马来酰亚胺(BMI)基胶粘剂的改性剂,探讨了BZ含量对改性胶粘剂的力学性能、介电性能、耐热性、耐水性和可操作性等影响。结果表明:当w(BZ)=2%时,改性胶粘剂的综合性能较好,其常温剪切强度(24.98 MPa)和高温(200℃)剪切强度(21.24 MPa)分别比未改性胶粘剂提高了16.9%和32.7%、介电系数低于3.0、吸水25 h后的吸水率仍低于1.2%且耐热性能未受到影响;170℃时凝胶时间为71 min,说明改性胶粘剂的可操作性较强,并且满足使用期的要求;改性胶粘剂在电子电器行业中具有良好的应用前景。     

苯并噁嗪/环氧树脂基碳纳米管复合材料

制备出一种新型的由苯并噁嗪、环氧树脂和碳纳米管(MWNT)组成的复合材料。对MWNT进行了表面改性,降低了苯并噁嗪和环氧树脂固化的温度,增强了MWNT与苯并噁嗪/环氧树脂基体间的结合力。对该复合体系进行了分步固化的研究。动态力学分析与热重分析表明由于MWNT的加入使得复合材料的储能模量和耐热性增加。通过断面扫描用SEM观察了MWNT在复合材料中的分散情况。