改性羟甲基羟丙基纤维素在苯丙乳液中的增稠性研究  

Thickening Characteristic of Modified Carboxymethyl Hydroxypropyl Cellulose in Styrene-Butyl Acrylate-Acrylic Acid Copolymer Latex

作　　者：王思浦 黎秉环[1] 许凯[1] 刘跃平[1] 李慧琼 

机构地区：[1]中国科学院广州化学研究所,广州510650

出　　处：《纤维素科学与技术》1999年第4期8-13,共6页Journal of Cellulose Science and Technology

基　　金：国家自然科学基金

摘　　要：用旋转粘度计研究了改性波甲基羟丙基纤维素（M-CMHPC）在苯丙乳液（SC）中的增稠世。在较低的M－CMHPC用量范围内，增稠体系呈现较明显的Bingham塑性流型特征。透射电子显微镜观察进一步证实了增稠体系形成以SC粒子为联结点，M－CMHPC分子为桥的“桥式”网络凝胶结构。形成较完整的网络凝胶可归因于M-CMHPC的复醚结构。结构形成使增稠体系呈现较高的屈服值Y和融变度Tx。M-CMHPC较高的增稠效能使增稠体系呈现较高的塑性粘度值PV。较高的Y、Pv和Tx值有助于提高增稠体系的胶体稳定性。The thichening characteristic of modified carboxymethyl hydroxypropyl cellulose (M -CMHPC) in styrene - butyl acrylate - acrylic acid copolymer latex (SC ) was studied by arotational viscosimeter. The thickened system exhibited obvious Bingham plastic flow characteristicin lower amount of M - CMHPC. TEM analysis further confirmed that the thickened system formed network gel structure which consists of latexes as 'conjunct points' and thickener macromolecule as 'bridges'. The formation of complete gel network structure is attributed to the complex ether structure of M - CMHPC molecule and resulted in higher yield value (Y) anddegree of thixotropy (Tx) leading to a higher plastic viscosity value (Pv) and therefore an increase in colloid stability of thickened system.

关 键 词：改性羧甲基 羟丙基 纤维素 苯丙乳液 增稠性 

分 类 号：O636.11[理学—高分子化学] TQ352.7[理学—化学]