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101.
102.
甲酸甲酯合成与转化的催化技术 总被引:3,自引:0,他引:3
本文评述了甲酸甲酯(MF)合成与转化的催化技术,展示了从MF出发发展C_1化学的可能途径,在MF的合成方面详细地分析了从甲醇出发的羰化法、脱氢法和氧化法催化技术,简介了我们的有关研究工作。 相似文献
103.
This paper studied the synthesis of a novel elastomeric copolymer electrolyte in an aqueous phase. The monomer, sodium allyl sulfonate (SAS), was dissolved in continuous aqueous phase and the second monomer, methyl acrylate (MA), was supplied from MA micelles as dispersed phase. The copolymerization of the two monomers took place in continuous aqueous phase. Confirmed by FTIR and 1H‐NMR, a binary copolymer electrolyte of MA and SAS, poly(MA‐co‐SAS), was obtained. The glass transition temperature of the copolymer was indicated as 20.4°C by DSC thermogram, thus, it behaves an elastomer in normal ambient temperature. The mechanical properties of the composite films consisting of both poly(MA‐co‐SAS) and Cu2+ ions or reduced copper were affected by the content of ions and reduced copper. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 100: 2796–2802, 2006 相似文献
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In studies of feeding by the bark beetle, Ips paraconfusus, two pine stilbenes (pinosylvin and pinosylvin methyl ether), ferulic acid glucoside, and enantiomers of the four most common sugars present in ponderosa pine phloem (sucrose, glucose, fructose, and raffinose) did not stimulate or reduce male feeding when assayed on wet -cellulose with or without stimulatory phloem extractives present. When allowed to feed on wet -cellulose containing sequential extracts (hexane, methanol, and water) of ponderosa pine phloem, methanol and water extractives stimulated feeding, but hexane extractives did not. Males confined in wet -cellulose containing aqueous or organic extracts of culture broths derived from phloem tissue and containing the root pathogen, Heterobasidion annosum, ingested less substrate than beetles confined to control preparations. In an assay using logs from uninoculated ponderosa pines, the mean lengths of phloem in the digestive tracts increased as time spent feeding increased. Males confined to the phloem of basal logs cut from ponderosa pines artificially inoculated with H. annosum ingested significantly less phloem than beetles in logs cut from trees that were (combined) mock-inoculated or uninoculated and did not contain the pathogen. However, individual pathogen-containing treatments were not significantly different from uninoculated controls. It was concluded that altered feeding rates are not a major factor which may explain why diseased ponderosa pines are colonized by I. paraconfusus. 相似文献
107.
将GPC和特性粘数[η]测定相结合,在室温和-78℃下,用Co~(60)辐射源辐照,研究了二甲基硅橡胶(MQ,吸收剂量2.05×10~3~3.97×10~4Gy)和甲基乙烯基硅橡胶(MVQ,吸收剂量10~2~10~4)分子量和凝胶含量的变化。结果表明,辐照MVQ较辐照MQ易生成凝胶,在凝胶点前的较低吸收剂量时,溶胶的分子量出现极大值,分子量分布曲线呈单峰;随吸收剂量的增加,分子量分布变窄,分子量降低;出现凝胶的吸收剂量,MQ大约是MVQ的10倍。辐照MQ时,凝胶点前的溶胶的分子量分布曲线为双峰,并随吸收剂量的增加,双峰消失,分子量下降;在凝胶点时,分子量出现极大值。 相似文献
108.
Biodiesel was produced by transesterification of soybean oil with methanol using ZnO loaded with KF as a solid base catalyst.
It was found that the catalyst with 15 wt.% KF loading and calcined at 873 K showed the optimum activity. XRD, IR and Hammett
indicator method were employed for the catalyst characterization. The results showed the activity of the catalysts was correlated
with their basicity. The influence of various reaction variables on the conversion was also discussed. 相似文献
109.
纳米TiO2光催化氧化愈创木酚的降解机理 总被引:1,自引:1,他引:1
以木质素的模型物愈创木酚(G-M)为研究对象,采用自制的纳米TiO2作光催化剂,在一定的降解条件下对G-M光催化降解的动力学和机理进行了研究.实验表明G-M的光催化降解过程包括吸附和降解两部分,通过对G-M在TiO2表面吸附性能的测定,得到其吸附平衡常数,在此基础上运用L-H方程对G-M光催化降解的动力学方程进行讨论,得到降解反应动力学方程1/r=1.744/C 0.103 4.采用有机物特征功能团的显色法,对G-M光催化降解反应过程的中间产物进行了分析,推断在G-M降解反应过程中出现了开环、脱羧,最终完全分解矿化生成二氧化碳和水. 相似文献
110.
丙烯酸酯无皂乳液的研究 总被引:4,自引:1,他引:4
在甲基丙烯酸甲酯和丙烯酸丁酯的无皂乳液体系中,加入适量的自制聚氨酯型反应性乳化剂(URE),考察单体配比和有机溶剂对乳胶膜性能的影响,并研究了聚合物乳液的稳定性。结果表明:与传统乳液聚合体系相比,所合成的胶乳耐电解质、耐酸碱、耐有机溶剂的性能均好。 相似文献