N-L－丙胺酰马来酰亚胺自由基均聚合反应的研究

合成了N-L-丙胺酰马采酰亚胺单体．并对其进行了聚合研究，讨论了引发剂浓度、单体浓度、温度等因素对聚合反应的影响，得到了聚合反应速率表达式：R。=k[I]^e.s[M]。并根据Arrehenius方程计算不同反应温度下的k值、A值和Ea值。讨沦了溶剂和温度对旋光度的影响．聚合物结构用红外光谱、旋光仪和圆二色谱进行表征。     

等离子体引发高吸醇性树脂的合成及性能

以丙烯酸为单体 ,Ni(NO3) 2 ·6H2 O为交联剂 ,采用低温等离子体引发其水溶液聚合 ,制得吸甲醇率达 64g/g、吸乙醇率达 48g/g的高吸醇树脂。考察了后聚合时间、单体质量分数、放电时间以及交联剂与单体质量比等操作参数对树脂吸醇率的影响 ,得出了试验条件下的最适宜合成条件。     

接枝聚合中阻聚技术研究进展

论述了接枝聚合中阻聚技术的研究发展,包括3种接枝聚合过程中阻聚的研究,即高能辐射引发、紫外光辐射引发和过氧化物引发接枝聚合中的阻聚技术.讨论了各种阻聚剂和接枝工艺对接枝聚合的影响.探讨了各种阻聚技术的机理.归纳了对阻聚剂的特点,并对阻聚技术的发展趋势作了预测.     

丙烯酸复鞣剂均聚过程中分子量的控制研究

合成了水溶性聚丙烯酸复鞣剂，通过测定聚合过程中体系粘度的变化，研究了影响分子量的主要因素及控制分子量的方法。     

Emulsion copolymerization of tetrafluoroethylene with ω‐chlorotetrafluoroethyltrifluorovinyl ether and the synthesized copolymer properties

Emulsion copolymerization of ω‐chlorotetrafluoroethyltrifluorovinyl ether (Cl(CF₂)₂OCF = CF₂ (FVE)) with tetrafluoroethylene (CF₂ = CF₂ (TFE)) was investigated at various monomer ratios. The copolymerization rate is below the rate of TFE homopolymerization and the copolymerization kinetics depends on the FVE content in the reaction medium. The copolymer composition is very similar if the FVE content in monomer mixture is ≤2.5 mol %. However, the percent amount of FVE in the copolymer, the copolymerization rate, and molecular mass of synthesized copolymers decrease noticeably with increase in the FVE content in the monomer mixture. The constants of copolymerization are r₁= 2.8 (TFE) and r₂ = 0.03 (FVE). The copolymer is a statistical polymer consisting of TFE blocks and individual FVE molecules between the blocks. The average molecular mass of copolymers is significantly less than that of the TFE homopolymer (PTFE) synthesized at the same conditions. The morphologies of PTFE and copolymer powders were investigated by thermomechanical analysis and are not similar. The copolymer has a completely amorphous diblock morphology depending on the FVE content. The introduction of FVE molecules into the copolymer macromolecules is accompanied by reduction of the crystalline portion of copolymer. If the FVE content in copolymer is ≥3.5 mol %, the copolymer macromolecules completely lose the ability to form crystalline portions as a result of their amorphicity. The introduction of up to 2.4 mol % FVE into the copolymer macromolecules yields a highly thermostable and meltable copolymer which can be processed by using the industrial processes used widely for thermoplastics. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2011     

Chemical reactions affecting halloysite dispersion in epoxy nanocomposites

Halloysite nanotubes (HNTs) have attracted a technologic and scientific attention as reinforcements of epoxy-based nanocomposites. However, their reported interaction with epoxy matrices is varied and the controlled dispersion of HNTs is still a challenge. In this work, we study the effect of chemical reactions taking place in the dispersion process of halloysite and their possible influence in the composite's properties. HNTs' surface was modified through an alkaline treatment and by grafting two aminosilanes with different chain lengths and functionality numbers. Evidence of homopolymerization and degradation reactions was found, depending on the surface treatment. The rheological study indicated that an interconnected network can be achieved in epoxy/HNTs blends depending on the surface chemical characteristics of the nanofillers and the blending method. The better dispersion was accomplished when ultrasonicating with the aid of a solvent. Nevertheless, the mechanical properties of the nanocomposites are not warranted by selecting a dispersion method. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019 , 136, 47979.     

CA488汽车发动机燃油编织胶管的研制

重点介绍用氯醇橡胶和ＮＢＲ－２２０Ｓ并用胶生产ＣＡ４８８汽车发动机燃油路连接用胶管的胶料配方和生产工艺。该胶管符合德国大众汽车公司同类产品标准。