嵌段共聚水溶性高分子在空气/水界面吸附态的构象

对于用几种不同疏水／亲水单体比合成的聚(丙烯酸丁酯／丙烯酸)共聚物样品测定了其水溶液的表面张力,运用Gibbs吸附方程求得在样品溶液临界胶束浓度时样品在气／液界面的分子吸附面积,以此推测其吸附态构象。结果表明,亲水单体单元在共聚物中含量多时,样品分子趋于在水中溶解;疏水单体单元多时,样品分子趋于在表面吸附。其吸附态构象为分子链上相邻的数个丁酯侧基吸附于水面,形成“薄煎饼状”疏水微区。     

新型纺织浆料及其上浆织物退浆的要点

介绍了常用浆料,特别是乳液聚丙烯酸浆料、聚酯浆料、干法变性和深度变性淀粉以及瓜尔胶等新型浆料的特点,提出了对这些浆料退浆的要点,指出研究开发新型纺织浆料时应该首先考虑浆料的可退性,而印染企业在制定含新型浆料坯布的退浆工艺之前应该进行先锋实验.     

瓜尔胶对淀粉糊化粘度的影响

将瓜尔胶加入玉米淀粉中共同煮浆,使用快速粘度仪(RVA)测定瓜尔胶/玉米淀粉体系糊化过程中粘度变化.研究发现,瓜尔胶会大大增加玉米淀粉糊化的峰值粘度和浆液低温粘度,并且使淀粉的糊化温度升高,但是有利于降低淀粉浆液的低温回生速率.     

Electronic Absorption Spectra of Copper （ Ⅱ） Sulphophthalocyanine and Aggregation of the Dye in Aqueous Solution

Aggregation behavior of C.I. Direct Blue 86 was discussed using analyses of its UV-Vis spectra. The experiment results show that the dye molecules are inclined to aggregate in aqueous solution. Even in a very dilute solution of 0.050 μol/L, A618/A659 = 1. 239 8, showing that the dye monomers still coexist with its dimers. The strong aggregation trend may cause dye precipitates at a higher concentration, which is an important factor that should be considered in producing a formula of ink-jet inks containing the dye as a colorant.     

Modified Dye for Water-Fast Ink-Jet Printing

A quaternary ammonium compound containing amino acid residue was synthesized by Converting 3-chloro-2-hydroxy-propyalkyldimethylammonium chlorides into its epoxide derivatives, then attaching an amino acid to the epoxide derivatives synthesized a quaternary ammonium compound containing amino acid residue. Modified dyes were prepared by the ionotropy of anionic dyes with the quaternary ammonium compound containing amino acid residue. It was discovered that the modified dyes exhibited an excellent pH controllable solubility. These modified dyes have good water solubility at pH> 8.0, but they were water insoluble at pH < 6.5. On the printing paper, modified dyes in water-based ink-jet print ink could convert to water insoluble form and give prints excellent water fastness.