Block crystallization effect on the conformation of triblock oligomers α-n-alkyl-ω-n-alkoxyoligo(oxyethylene)s in the solid state
作者:K Fukuhara、K Hashiwata、K Takayama、H Matsuura
DOI:10.1016/s0022-2860(99)00393-2
日期:2000.5
triblock oligomers α- n -alkyl-ω- n -alkoxyoligo(oxyethylene)s, C 6 E m C 6 ( m =6–8), C 8 E m C 8 ( m =6–8) and C 10 E m C 10 ( m =1–8), were measured in the solidstate at liquid nitrogen temperature, and the crystallinity and conformational behavior with changing block chain length was studied. The results of the spectral analysis showed that the solid of the C n E m C n compounds with n ≳ m is crystalline
摘要 三嵌段低聚物α-n-烷基-ω-n-烷氧基低聚(氧乙烯)s, C 6 E m C 6 ( m =6-8), C 8 E m C 8 ( m =6-8) 的红外光谱和C 10 E m C 10 ( m =1–8) 在液氮温度下以固态进行测量,并研究了随着嵌段链长度变化的结晶度和构象行为。光谱分析结果表明,n≳m的CnEmCn化合物的固体为结晶体,分子形式确定,而n≲m的化合物中的烷基嵌段为部分结晶或非结晶,含有构象缺陷,如端部扭结和扭结。C n E m C n 化合物的结晶度和构象特性根据组成嵌段的结晶速率来阐明。如果氧乙烯嵌段比烷基嵌段结晶得快,烷基链变形,形成构象缺陷,以适应螺旋氧乙烯链形成的空隙。另一方面,如果烷基嵌段的结晶发生得更快,则氧乙烯链呈现全反式平面构象,其横截面积与烷基链的横截面积相似。
A hydroxy group-containing aryl triazine ultraviolet absorber represented by the formula: ##STR1## wherein the R moiety of the OR group is a linear or branched aliphatic alkyl group containing 3 carbon atoms substituted by one or more alkoxy groups of 1 to 12 carbon atoms, said moiety being further substituted by one or more hydroxy groups, and wherein R.sup.19, R.sup.20, R.sup.21, R.sup.22, R.sup.23, R.sup.24 and R.sup.25 are independently selected from the group consisting of hydrogen, hydroxy, alkyl of 1 to 12 carbon atoms, alkoxy of 1 to 12 carbon atoms, sulfonic, halo, carboxy, haloalkyl and acrylamino.
Mono Quaternary Ammonium Salts and Methods for Modulating Neuronal Nicotinic Acetylcholine Receptors
申请人:Crooks Peter
公开号:US20100113511A1
公开(公告)日:2010-05-06
Provided are monoquaternary ammonium compounds which are modulators of nicotinic acetylcholine receptors. Also provided are methods of using the compounds for modulating the function of a nicotinic acetylcholine receptor, and for the prevention and/or treatment of central nervous system disorders, substance use and/or abuse, and or gastrointestinal tract disorders.
A synergistic stabilizer composition for polymers is described containing (i) a hydroxy-group containing triazine, and (ii) a 2,2,6,6-tetraalkyl piperidine compound. Also, described is a method of stabilizing polymers.
描述了一种用于聚合物的增效稳定剂组合物,其中含有 (i) 含羟基的三嗪和 (ii) 2,2,6,6 四烷基哌啶化合物。此外,还介绍了一种稳定聚合物的方法。
Mulley, Journal of the Chemical Society, 1958, p. 2065