CNC经ATRP接枝含胺基聚合物制备具有pH响应Pickering乳化剂

Preparation of pH-responsive Pickering Emulsion Based on CNC ATRP-grafted Polymers Containing Amino Groups

关键词:  纤维素纳米晶体  ATRP接枝反应  pH响应  Pickering乳化剂

Key Words:CNC  ATRP graft reaction  pH-responsive  Pickering emulsion

摘要:本研究对纤维素纳米晶体（CNC）进行溴代异丁基接枝，然后在甲醇-水溶剂中室温下进行原子转移自由基聚合（ATRP），制备了含有叔胺基聚合物支链的CNC改性产物（CNC-PDMAPMA、CNC-PDMAEMA、CNC-PDEAEMA）。采用多种手段对产物进行了分析和表征，证实聚合物接枝CNC改性产物成功制备。当这3种改性产物的悬浮液质量分数为0.8%时，其表面张力分别为50.6、51.7和 54.4 mN/m，具有良好的表面活性。质量分数0.6%的聚合物改性CNC稳定的甲苯/水和庚烷/水Pickering乳液至少可以保存15天而不出现相分离。3种改性产物的水分散液具有对甲苯（庚烷）/水乳液的N₂/CO₂乳化-破乳响应性转换能力。

Abstract:In this study， cellulose nanocrystal （CNC） was grafted with bromo-isobutyryl bromide to prepare CNC modified Pickering agents （CNC-PDMAPMA， CNC-PDMAEMA， and CNC-PDEAEMA） containing side chain of amino polymers through ATRP grafted polymerization in methanol/water solution at room temperature. The as-prepared products were analyzed and characterized using vaious methods， which confirmed the successful preparation of the CNC-grafted polymers. It was found that when the concentration of the product （in suspension） was 0.8%， the surface tensions of which were 50.6， 51.7， and 54.4 mN/m， respectively， showing good surface activity. The toluene/water and heptane/water Pickering emulsion stabilized by 0.6 wt% modified CNC could be stored for at least 15 days without phase separation. Moreover， the as-prepared 3 products in suspension possessed pH switch-ability responding to N₂/CO₂ emulsion-demulsification for toluene/water or heptane/water emulsion.