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| The graft copolymerization of epoxy ether terminated polystyrene (PSt - ep) macromer with epichlorohydrin (ECH) was studied by using a quaternary catalyst system which was composed of Al (i-Bu)3, H3PO4, H2O and amine in the molar ratios of 1 : 0.25 : 0.25 : 0.1-0.5 .The results showed that when the mass ratio of PSt-ep/ECH = 25% -56% ,and Mn of PSt-ep was (4.24 - 6.07) × 103, the conversion ratio of ECH was greater than 95% , and the graft efficiency was 40% - 85% . The purified copolymer was characterized by... The graft copolymerization of epoxy ether terminated polystyrene (PSt - ep) macromer with epichlorohydrin (ECH) was studied by using a quaternary catalyst system which was composed of Al (i-Bu)3, H3PO4, H2O and amine in the molar ratios of 1 : 0.25 : 0.25 : 0.1-0.5 .The results showed that when the mass ratio of PSt-ep/ECH = 25% -56% ,and Mn of PSt-ep was (4.24 - 6.07) × 103, the conversion ratio of ECH was greater than 95% , and the graft efficiency was 40% - 85% . The purified copolymer was characterized by IR ,1H-NMR ,DMS and TEM to be a copolymer with uniform grafts .When the molecular weight of PSt-ep macromer increased from 2.63 × 103 to 8.04×103, the tensile strength of graft copolymer increased from 2.9 MPa to 12.1 MPa , the elongation at break decreased from 300% to 140% , permanent set decreased from 8% to 4% , Shore hardness increased from 55 A to 80 A . The graft copolymer could be melted and processed repeatedly , and its oil and solvent resistances were better than PSt , and similar to PECH . | 以Al(i-Bu)_3:H_3PO_4:H_2O:二甲基苯胺=1:0.25:0.25:0.1—0.15(mol比)组成的体系为催化剂,研究了端环氧基聚苯乙烯(PSt-ep)大单体与环氧氯丙烷(ECH)的接枝共聚。结果表明,当PSt-ep/ECH=25％—56％(质量),PSt-ep的(?)_n为(4.24—6.07)×10~3时,ECH转化率大于95％,接枝效率为40％—85％。共聚物经IR,~1H-NMR、动态力学谱和电镜表征,表明是规整接枝共聚物。随PSt-ep大单体分子量的增大(2.63×10~3—8.04×10~3),拉伸强度增高(2.9—12.1MPa),扯断伸长率下降(300％—140％),永久变形下降(8％—4％),硬度有所增高(55—80度,邵尔A型)。共聚物可重复熔融加工。在PSt/PECH(3/7,质量比)共混物中加入2％(质量)共聚物,后者具有良好的增容作用。共聚物的耐油性和耐溶剂性优于PSt,与PECH相近。 | Epoxy ether terminated polystyrere macromers were prepared by reaction of the polystyrene anions with epichlorohydrin. Conditions for increasing the content of epoxy ether end groups were studied. The macromers obtained were homopolymerized in solution using i-Bu_3Al-H_2O-H_3PO_4-dimethylaniline system as catalyst. The results show that the content of epoxy ether end groups of the macromers can reach about 50%; the homopolymers obtained are dimers, and the yield of which increases with decreasing molecular weight... Epoxy ether terminated polystyrere macromers were prepared by reaction of the polystyrene anions with epichlorohydrin. Conditions for increasing the content of epoxy ether end groups were studied. The macromers obtained were homopolymerized in solution using i-Bu_3Al-H_2O-H_3PO_4-dimethylaniline system as catalyst. The results show that the content of epoxy ether end groups of the macromers can reach about 50%; the homopolymers obtained are dimers, and the yield of which increases with decreasing molecular weight of the macromers. | 用正丁基锂引发苯乙烯聚合,再将所得聚苯乙烯阴离子与环氧氯丙烷进行封端反应,制得末端带环氧基的聚苯乙烯大分子单体。考查了封端剂种类、聚合溶剂、聚苯乙烯末端阴离子类型、封端反应温度、分子量及反应方式等因素对大单体合成的影响。用GPC对大单体进行了表征,并将此种大单体进行溶液均聚。结果表明,选择适当的条件可以将大单体末端的环氧基含量提高到近50%;大单体的均聚产物经GPC分析是二聚物,随大单体分子量减小二聚物产率增加。 | The additive of epoxy resin epoxy ether was synthesized by epoxy resin of type diphenol A and diethandiol ether. The experiment showed the the mass of catalyst , the temperature and the type of epoxy resin affected properties of epoxy ether resin. | 本文以双酚Ａ型环氧树脂和二乙二醇醚为主要原料，合成了新型环氧树脂添加剂──环氧醚。实验表明，催化剂用量、反应温度和环氧树脂的种类对环氧醚的性能有较大的影响。 | | | | << 更多相关文摘 |
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epoxy-ether
环氧醚
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