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。     

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。     

双酚型苯并(噁)嗪热性能与结构的关系

对不同结构双酚型苯并噁嗪树脂的热固化温度,固化物化学耐热性和热机械性能进行了综述。通过分析,总结出不同间隔基与不同胺取代基对苯并噁嗪树脂上述性能的影响,并试图寻求一种具有最佳热机械性能的苯并噁嗪树脂。     

含硅苯并噁嗪的制备及其对双马来酰亚胺树脂固化反应动力学的影响

通过溶剂法设计合成出了结构中含有硅元素的新型苯并噁嗪单体(Si-BOZ),以其作为改性体系对双马来酰亚胺树脂(BMI)进行共混改性,在降低BMI预聚物粘度的同时优化其固化工艺,改善其综合性能。选用平板小刀法测定了Si-BOZ、BMI、Si-BOZ/BMI等树脂体系的凝胶时间,红外光谱(FTIR)跟踪研究了Si-BOZ和BMI在固化过程中所发生的化学反应,非等温差示扫描量热法(DSC)研究了Si-BOZ/BMI树脂体系的固化反应动力学特征,并通过Kissinger法和Ozawa法对两者固化过程中的各参数进行了讨论。     

苯并噁嗪树脂的合成及应用

本文综述了苯并 口恶嗪树脂的合成、性能、改性和应用。     

一种新型工程塑料——苯并嗯嗪的研究进展

苯并嗯嗪是一种新型热固性树脂，从单体引入功能基团、共混改性、加入纳米材料和增强纤维4个方面综述了苯并嗯嗪改性的研究进展。     

Reinforced properties of polybenzoxazine-based nanocomposites with siloxane benzoxazine-modified halloysite nanotubes

Siloxane benzoxazine monomer (Ba-s) was synthesized using phenol, 3-aminopropyltriethoxysilane (KH-550), and paraformaldehyde, and then introduced onto halloysite nanotubes (HNTs) surface as a coupling agent to obtain functionalized HNTs (mHNTs). 1, 6-hexanediamine/phenol benzoxazine (Ba-h) was selected as a matrix to blend with mHNTs at the mass ratios of 1:0, 9:1, 7:1, 6:1, 4:1,7:3, and 3:2, respectively. The ring-opening copolymerization behaviors of the nanocomposites were investigated by differential scanning calorimetry. The results implied that the polymerization temperature of Ba-h was decreased by the grafted HNTs. The results of thermogravimetric analysis and dynamic mechanical analysis displayed that the obtained copolymers exhibit different degrees of improvement in the thermal stability and mechanical properties of Ba-h. These enhancements are attributed to the homogeneous dispersion of HNTs and the strong matrix-nanoparticle interactions based on SEM and TEM results. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019 , 136, 47882.     

Rheokinetic studies and compressive response of high performance polybenzoxazine syntactic foams

Polybenzoxazines are finding increasing usage in demanding applications where high temperature stability is required, especially in the field of aerospace. In this work, thermally stable bisphenol F-based polybenzoxazine [poly(BF-a)] syntactic foams containing varying volume fractions (30–60%) of hollow glass microballoons (HGMs) were prepared and their mechanical response in the quasi-static regime was established. The effect of introducing glass microballoons on the curing profile of benzoxazine resin was studied using both nonisothermal differential scanning calorimetry and rheometry. Temperature-sweep experiments were performed to arrive at the optimal processing window of the benzoxazine-glass microballoons formulations, particularly in terms of viscosity, gelation temperature, and time. Thermally accelerated ring-opening polymerization of the benzoxazine resin led to complete curing of the syntactic foam formulations, as assessed by calorimetric studies. The thermal degradation behavior of the poly(BF-a)/HGM was studied using thermogravimetric analysis. As expected, the density of the syntactic foam specimens decreased with increasing microballoon content. Maximal increase in the specific compressive properties of the poly(BF-a)/HGM samples was observed in formulations containing 40% volume fraction of glass microballoons. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019 , 136, 47234.     

Bio-based benzoxazines based on sesamol: Synthesis and properties

Sesamol was used with furfurylamine, dehydroabietylamine, and stearylamine to prepare three fully-bio-based benzoxazines: S-fa, S-da, and S-sa, respectively. Their structures were confirmed by Fourier transform infrared spectroscopy (FTIR), ¹H-NMR, and ¹³C-NMR. FTIR and differential scanning calorimetry were performed to monitor the curing behaviors of S-fa, S-da, and S-sa. The thermal stability of the corresponding polybenzoxazines was supported by thermogravimetric analysis, and all polymers showed high thermal stability. The limiting oxygen indexes of all three polybenzoxazines were higher than 30, suggestive of good flame retardancy. The use of polybenzoxazine for the corrosion protection of Q235 low-carbon steel was also studied. The results of OCP curves and Tafel plots demonstrate that the polymer coatings provide good corrosion resistance and can be applied to this purpose. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019 , 136, 48255.