六水三氯化铁催化合成香蕉水反应时间的探讨

用六水三氯化铁作催化剂,改变反应时间和不用带水剂合成香蕉水。结果显示：当反应时间为5 min时,香蕉水的产率为85.56%;当反应时间为60 min时,香蕉水的产率为90.04%;当反应时间为180 min时,香蕉水的产率为82.16%。实验得出,香蕉水产率最高的反应时间为60 min,最佳反应时间为55~65 min...     

提高聚醋酸乙烯酯乳液性能的实验研究

目的:提高聚醋酸乙烯酯乳液的稳定性和耐水性.方法:采用醋酸乙烯酯为聚合单体、聚乙烯醇为胶体保护剂及乳化剂壬基酚聚氧乙烯醚的聚合反应,制备聚醋酸乙烯酯乳液.再利用单组实验法研究聚乙烯醇、乳化剂、引发剂、加料方式及反应温度等对制备稳定性和耐水性好的聚醋酸乙烯酯乳液的影响规律.结果:制备粘接强度、稳定性和耐水性良好的聚醋酸乙...     

乙酸镁改性条件对凹凸棒黏土黏度的影响

采用乙酸镁对凹凸棒黏土进行改性处理,考察了乙酸镁浓度、悬浮液浓度和pH值、反应温度和搅拌时间以及放置时间等因素对凹凸棒黏土在蒸馏水和饱和氯化钠水溶液中黏度的影响。结果表明,在乙酸镁浓度10%,悬浮液浓度7.5%,pH=8,反应温度20℃,反应时间14 h和放置时间24 h的条件下,改性凹凸棒黏土有最高的黏度。其中,在饱和氯化钠水溶液中的黏度高于蒸馏水中的黏度。     

水滑石/膨胀型阻燃剂复合体系改性LDPE/EVA共混物研究

以氯磷酸二苯酯、乙二胺等为原料,合成了膨胀型阻燃剂N,N′-双(二苯氧基磷酰基)-2,2′-乙二胺(PEA),水滑石(LDH)与PEA复配阻燃改性低密度聚乙烯(LDPE)/乙烯-醋酸乙烯共聚物(EVA)共混物。结果表明,当LDPE/EVA/LDH/PEA的质量比为80/20/20/10时,所得复合材料的阻燃等级可达到UL94 V-1级别,极限氧指数(LOI)达28.3%;LDH与PEA复配使用提高了LDPE/EVA共混物热分解残留率;LDH和PEA协同作用强化了炭层,提高了复合材料的阻燃性能。     

Introduction of methyl groups to acetate substituted chain of (Z)-5-decenyl acetate,a pheromone component of turnip moth,agrotis segetum: synthesis,single-sensillum recordings,and structure-activity relationships

Methyl-substituted analogs of (Z)-5-decenyl acetate, a pheromone component of the turnip moth,Agrotis segetum, have been synthesized and studied by electrophysiological single-sensillum recordings and molecular mechanics calculations [MM2(85)]. The analogs are monomethyl substituted in the 2, 3, 4, and 5 positions and geminally dimethyl substituted in the 2, 3, and 4 positions. The methyl groups have been employed as space probes to study the degree of steric complementarity between the acetate-substituted alkyl chain of the pheromone component and its receptor. The electrophysiological activities, interpreted in terms of a receptor interaction model, indicate significant steric repulsive interactions between the introduced methyl groups and the receptor. This implies a high degree of complementarity between the acetate-substituted alkyl chain of the natural pheromone component and its receptor.Schiff., Lepidoptera: Noctuidae.     

Calling behavior and pheromone titer in the smaller tea tortrix moth,Adoxophyes sp. (Lepidoptera: Tortricidae)

The calling behavior and pheromone titer in the female smaller tea tortrix moth,Adoxophyes sp., were investigated under a 1410-hr light-dark photoperiod. Quantitative gas chromatographic analysis of ovipositor extract for (Z)-11-tetradecenyl acetate (Z11–14Ac) and (Z)-9-tetradecenyl acetate (Z9–14Ac), the major pheromone components of this species, obtained on the third day postemergence, indicated that extractable amounts of sex pheromone were present throughout the period of observation. Maximal pheromone titer and calling activity was reached at 8 and 10 hr after onset of scotophase, respectively. The ratio ofZ11–14Ac toZ9–14Ac through the 24-hr period varied significantly. The significance of the sex pheromone component ratio variation on the attraction of males was tested in a field experiment. The ratio of males trapped by the most attractive blend versus the least attractive one was 2.16.     

EVA改进聚醋酸乙烯乳液粘合剂性能的研究

本研究采用EVA乳液作为种子进行聚合制备改性聚醋酸乙烯乳液粘合剂。讨论了EVA乳液的用量对聚合物的耐寒性、表面张力的影响。同时,对聚合温度、搅拌速度、引发剂用量、聚合保温时间等进行了选择。改性后的白胶粘合剂具有多次循环的冻融稳定性,且对低表面能材料的粘接强度明显高于通用白胶     

稀土固体超强酸对合成乙酸乙酯的催化性能研究

采用稀土元素La^3 对固体超强酸的改性，制备出稀土固体超强酸SO4^2-/TiO2/La^3 催化剂，并研究了它对合成乙酸乙酯的催化性能。     

微波催化酯化合成乙酸乙酯

在铌酸的催化下，采用微波辐射技术，快速合成了乙酸乙酯。最佳反应条件为：乙酸和乙醇的摩尔比为4：1（mol/mol)，催化剂0.8g，微波功率336W，微波辐射时间8min，转化率91．5％。