排序方式： 共有7条查询结果，搜索用时 15 毫秒
1
1.
溶剂分子对聚合物的作用可以从许多方面进行研究,溶剂分子在聚合物中的扩散能力可用其扩散系数的大小来衡量。1973年加拿大多伦多大学Gray和Guillet首先提出了用反气相色谱的方法(Inverse Gas Chromatography)测定溶剂在聚合物中的扩散系数,后又有人逐步完善,该法的理论依据是Van Deemter的速率理论,即H=A+B/u+cu,H为色 相似文献
2.
氟橡胶(Fluorogum)作为具有耐高温、耐油、耐化学腐蚀及耐燃和耐真空的特种合成高分子弹性体,已成为航天、航空、导弹、火箭等尖端科学及其它工业方面不可缺少的材料。溶度参数δ_2,Hildebrand-Scatchard溶液理论定义它为内聚能密度的平方根,业已证明,它是反映高聚物性能的有效经验参数。由于高聚物没有明显的蒸气压,而且其摩尔体积又难以测定,因而,迄今为止常通过对 相似文献
3.
INTRODUCTION Environmental concerns have been growingfor the past two decades. High industrial density,human population density and the use of old andpolluting technologies all cause increasing levels ofpollutant emissions. This situation has highlightedthe need for cleaner technologies (Rao et al., 2003;Muthusubramanian et al., 2003). Cleaner technol-ogy has the following advantages: (a) Wasteminimization; (b) Pollution prevention; and (c)Green productivity. Implementing cleaner… 相似文献
4.
敌克松(地可松,Dexon,Fenaminosalf),为重氮盐类杀菌剂,对水稻烂秧病、棉花苗期病害及小麦腥黑穗病等均有很好的防效。据报道,敌克松一般毒性为:大鼠口服LD_(50)=60mg/kg,大鼠经皮LD_(60)>50mg/kg。Rec assay和Ames法试验表明,敌克松对人及生物存在致突变及致癌的潜在危险。为结合敌克松生产厂废水的治理,我们对敌克松水溶液的光解作了初步研究。 相似文献
5.
6.
Environmental concerns have highlighted the need of cleaner technologies. A cleaner, convenient and selectivetechnology has been developed for the preparation of 3-(4,6-dimethoxy-pyrimidin-2-yloxy)-2-methyl-phenol (DPMP) from2-methyl-benzene-l,3-diol in water as solvent. The isolated yield of DPMP is up to 86% in good selectivity. The productstructure was characterized by conventional methods, 1H-NMR and MS. This technology belongs to the modern concept ofenvironmentally friendly low wastes or non-wastes technology (LWNWT). 相似文献
7.
Detoxification of chlorinated organic compounds via reaction with nickel/iron powder was implemented in aqueous solution. Compared to iron, nickel/iron bimetallic powder had higher hydrodechlorination activities for both atrazine (ATR) and p-chlorophenol (pCP); nickel/iron (2.96%, w/w) was shown to have the largest specific surface area and the optimum proportion for the dechlorination of both ATR and pCP. Electrochemical measurements showed that the adsorbed hydrogen atom on the nickel must have been the dominant reductive agent for the dechlorination of both ATR andpCP in this system. 相似文献
1