对分子结构对丙烯酸酯光引发聚合反应的影响进行了系统的研究。最初,研究的重点是氢键的作用,发现通过氢键进行的预组织可提高最大聚合速率(R p)。这种氢键促进的预组织也影响了所得聚合物的立构规整度。接下来,研究了由给定单体的计算偶极矩(μcalc)表示的极性影响。观察到R p与计算的玻尔兹曼平均偶极矩(μcalc)之间存在直接的线性关系。的[R p -μ计算值相关性适用于纯单体,单体混合物,甚至单体与惰性溶剂的混合物。这种相关性使得能够合理设计具有所需反应性的单体。另外,这些研究表明,聚合的传播步骤受氢键的影响,而偶极矩则影响终止速率常数。可以将这两种机理解释视为影响丙烯酸酯聚合速度的互补因素。
DOI:
10.1021/ma021785r
作为产物:
描述:
C.I.酸性橙108 、 异氰酸正丁酯 在
二氧化碳 作用下,
以
二氯甲烷 为溶剂,
30.0~90.0 ℃
、35.55 kPa
条件下,
反应 3.5h,
以2 mm Hg, leaving 181 g of solid product的产率得到1-丁基-3-(2-羟基乙基)脲
Synthesis of 1,3-Disubstituted Symmetrical/Unsymmetrical Ureas via Cs<sub>2</sub>CO<sub>3</sub>-Catalyzed Transamination of Ethylene Carbonate and Primary Amines
作者:Sachin R. Jagtap、Yogesh P. Patil、Anil G. Panda、Bhalchandra M. Bhanage
DOI:10.1080/00397910802638503
日期:2009.5.22
Abstract Cs2CO3-catalyzed transamination of primary amines and ethylene carbonate proceeds to form 1,3-disubstituted symmetrical/unsymmetrical ureas in excellent yields. The effect of different reaction parameters such as influences of bases, temperature, and reaction time were investigated for the title reaction.
Water borne high solids coating compositions are made by blending a water-dispersible, crosslinkable organic polymer free of amide groups, water, at least one reactive urea derivative, a crosslinking agent and optionally a crosslinking catalyst. Optionally a mixture of reactive urea and carbamate derivatives can be used. The resultant water borne high solids coating compositions can be either solutions or dispersions depending upon the particular polymer and reactive urea or carbamate chosen as the reactive cosolvent or reactive diluent.
申请人:Technology Corporation United Carbide Chemicals and Plastics
公开号:US05039759A1
公开(公告)日:1991-08-13
Water borne high solids coating compositions are made by blending a water-dispersible, crosslinkable organic polymer free of amide groups, water, at least one reactive urea derivative, a crosslinking agent and optionally a crosslinking catalyst. Optionally a mixture of reactive urea and carbamate derivatives can be used. The resultant water borne high solids coating compositions can be either solutions or dispersions depending upon the particular polymer and reactive urea or carbamate chosen as the reactive cosolvent or reactive diluent.
High solids coating compositions are made by blending a crosslinkable organic polymer, a solvent, at least one reactive urea derivative, a crosslinking agent and optionally a crosslinking catalyst. The resultant high solids coating compositions can be either solutions or dispersions depending upon the particular polymer and solvent and the reactive urea chosen as the reactive cosolvent or reactive diluent. The reactive urea derivatives can be mixed with reactive carbamate derivatives.
Water borne high solids coating compositions are made by blending a water-dispersible, crosslinkable organic polymer free of amide groups, water, at least one reactive urea derivative, a crosslinking agent and optionally a crosslinking catalyst. Optionally a mixture of reactive urea and carbamate derivatives can be used.
The resultant water borne high solids coating compositions can be either solutions or dispersions depending upon the particular polymer and reactive urea or carbamate chosen as the reactive cosolvent or reactive diluent.