A multi-functional polymer coating that is heat-resistant,hydrophobic and transparent

A multi-functional polymer film with high hydrophobicity and transparency was formed by simple casting of a polycarbonate solution onto a substrate having micro-scale roughness.The high hydrophobicity was heat-resistant,which can be retained up to 390 ℃.The polymer film may have potentially wide-ranging applications in industry and high technology.     

Synthesis and characterization of new soluble poly（aryl ether nitrile）s containing phthalazinone moiety

A series of novel poly（aryl ether nitrile）s containing phthalazinone moiety were synthesized by the nucleophilic displacement reaction of bisphenol-like monomers （I） with 2,6-difluorobenzonitrile. The inherent viscosities ranged from 0.46 to 1.07 dL g^-1. The glass transition temperatures were in the range of 277-295℃, and the temperatures for 10% weight loss in nitrogen atmosphere were found between 495 and 527 ℃. The structures of these resultant polymers were confirmed by FT-IR and 1^H NMR. Moreover, the properties of poly（aryl ether nitrile）s including solubility and crystallinity were also studied.     

Novel heat-resistance UV curable waterborne polyurethane coatings modified by melamine

Novel UV curable waterborne polyurethane coatings (UVWPU) modified by melamine was prepared using isophorone diisocyanate (IPDI), polyethylene glycol (PEG), α,α-dimethylol propionic acid (DMPA), hydroxyethyl acrylate (HEA) as main materials. Copolymer structure was verified using Fourier transform infrared spectroscopy (FT-IR). Performance of the coatings was evaluated by differential scanning calorimetry (DSC) and thermal gravimetric analysis (TGA), and mechanical tests such as pencil hardness and resistance to water. The results showed that the modified UVWPU film had the good thermal resistance, water resistance and mechanical properties. The optimum melamine dosage was 4.70 wt.%, the glass transition temperature (T_g) of the modified film increased by 20.4 °C and 5% weight-loss temperature (253 °C) increased by 105 °C. No change color, crinkle, desquamate, dehisce and frothy were found after the modified film dried at 130 °C for 2 h.     

一种防尘、耐高温消声器的研究

一种新型的消声器能应用在高温,含尘的条件下,消声器设计采用了四分之一波长吸声,其内部消声构造与防尘,耐高温有机结合起来,实现了防尘和消声的较佳效果。     

甲基丙烯酸甲酯-苯乙烯-N-苯基马来酰亚胺三元共聚物的研究

研究了甲基丙烯酸甲酯-苯乙烯-N-苯基马来酰亚胺三元共聚体系的组成以及分子量分布对共聚物的耐热及物理机械性能的影响.实验结果表明:在一定条件下如果适当控制混合单体比例,可望获得一种综合性能较优越的共聚物材料.     

HEAT-RESISTANT COMPOSITES CURED BY ELECTRON BEAM*

 Electron beam (EB) curing of composites has many advantages. Heat-resistant EB-curing composites could substitute polyimide composites used in aeronautical engines. In this paper, the effects of catalyst and dose on the cured resin were investigated. The heat-resistance of the resin cured by EB was evaluated by dynamic mechanical analysis (DMA). The experimental results show that the mechanical properties of the composites cured by EB could meet the specifications of aeronautical engines at 250℃.     

原子转移自由基聚合合成耐热性共聚物

自 1 995年第一篇有关过渡金属催化的原子转移自由基聚合 (ＡＴＲＰ)论文发表以来 ,国内外许多研究者都纷纷开展这方面的工作 ,人们已用该法合成了各类指定结构的聚合物[1～ 6] ,选用合适的引发剂比较容易合成出具有良好加工流动性的星型和超支化聚合物[2 ,3,6] .Ｎ 取代马来酰亚胺由于其环状结构而被广泛用于自由基共聚合制备耐热性聚合物[7～ 9] ,但Ｎ 取代马来酰亚胺的引入将降低聚合物的加工流动性 ,若能实现含Ｎ 取代马来酰亚胺单体结构的可控ＡＴＲＰ共聚合 ,利用多官能团引发剂如四溴甲基苯合成出星型耐热性共聚物 ,将可望同时改善聚…     

超支化聚硅氧烷改性双马来酰亚胺树脂的研究

将共聚改性与端氨基超支化聚硅氧烷(HBPSi(N))的合成一步完成,建立了一步法制备改性双马来酰亚胺树脂(记为B/D/H(N))的方法.以N,N′-4,4′-二苯甲烷双马来酰亚胺(BMI)、二烯丙基双酚A(DBA)组成的体系(记为B/D)为对比,探讨了HBPSi(N)含量对B/D/H(N)树脂性能的影响.研究结果表明,HBPSi(N)含量对B/D/H(N)树脂的性能有重要影响.少量HBPSi(N)的加入不仅可以显著提高固化物的韧性,而且能有效加快树脂的凝胶时间,同时大幅度提高固化树脂的耐热性、介电性能和耐湿性.这些性能的改善主要缘于HBPSi(N)的加入改变了交联网络的分子结构.B/D/H(N)体系优异的综合性能使之在制备先进树脂基复合材料、胶黏剂方面显示出很大的应用潜力.     

有机硅改性硼酚醛树脂的研制

通过Williamson醚合成、Claisen重排及硅氢化反应得到邻羟基苯丙基硅油(Si-phenol),将其与苯酚混合,采用硼酸酯法合成有机硅改性硼酚醛树脂(SBPF).利用1H NMR和FTIR技术对其结构进行分析,采用热重分析(TGA)、剪切测试、拉伸测试以及冲击测试等手段对其耐热能和力学性能进行表征.考察了Si-phenol的含量对树脂各项性能的影响,并研究其作用机理.结果表明,合成的有机硅改性硼酚醛树脂具有良好的耐热性,适量硅氧烷链段的引入可以改善树脂的黏接性能,提高其力学强度.     

MODIFICATION OF CeO2 AND ITS EFFECT ON THE HEAT-RESISTANCE OF SILICONE RUBBER

By means of the wet chemical surface modification,the surface of CeO_2 was modified by vinyltrimethoxysilane (VTMS).Infrared spectroscopy was used to investigate the structure of the modified CeO_2 and the result showed that VTMS has been attached onto the surface of CeO_2.Effect of VTMS concentration on the active index of the modified CeO_2 was also studied,and the result indicated that the active index of the modified CeO_2 increases with the increase of VTMS concentration and the optimal concentratio...