A STUDY ON THE MOLECULAR SIZE RANGE AND CORROSION INHIBITION PROPERTY OF THE GMT-A AGENT

本文介绍了水处理药剂ＧＭＴ＿Ａ的缓蚀性能与其分子量大小的关系．研究结果表明，经高速离心机分离后所得的ＧＭＴ＿Ａ低分子量组份（Ｍｒ＝５×１０２～８×１０４）具有良好的缓蚀性能，而高分子量组份（Ｍｒ＞８×１０５）具有良好的絮凝净化作用．研究还证实，ＧＭＴ＿Ａ水处理剂在絮凝净化与缓蚀两方面都具有比上述单一组份更优越的应用效果，表明药剂ＧＭＴ＿Ａ分子间有协同效应作用．     

PREPARATION AND CHARACTERIZATION OF ULTRA-HIGH MOLECULAR WEIGHT POLY(ETHYLENE TEREPHTHALATE)(PET)FIBER

This paper reports the spinning and drawing behavior of Ultra-high Molecular Weight polyethylene Terephthalate) (UHMW-PET) fibers. The as-spun fibers were produced by dry-jet wet spinning of a 15%-17% solution in 50:50(v:v) trifluroroacetic acid and dichloromethane. Both molecular weight and polymer solution concentration have marked effect on the drawability of the as-spun-fibers. The maximum extension drawing ratio (EDRmax) of as-spun fiber increases with increasing molecular weight, whereas optimal concentration to achieve the EDRmax of as-spun fibers decreases with increasing molecular weight. Drawing speed and temperature during the first step have remarkable effect on the drawability of these fiber during the second step. Relatively lower drawing temperature and drawing speed (19 ℃ , 60 mm/min) during the first drawing step was beneficial to mechanical properties of ultimate fibers. At the range of 210 ℃ to 230 ℃, the draw ratio (DR) during the second step increases with increasing temperature.     

CONSTRUCTING R-MATRICES AND SOLUTIONS OF THE YANG-BAXTER EQUATION BY COMPUTER ALGEBRA(Ⅰ)

给出用计算机代数系统Ｍａｔｈｅｍａｔｉｃａ建立约束系统的Ｒ矩阵的统一方法，并将其用于ＣＢ族和ＴＧ族的Ｒ矩阵