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Preparation of pH-responsive Pickering Emulsion Based on CNC ATRP-grafted Polymers Containing Amino Groups
Received:August 24, 2021  
DOI：10.11980/j.issn.0254-508X.2021.11.006
Key Words:CNC  ATRP graft reaction  pH-responsive  Pickering emulsion
Author NameAffiliationPostcode
FU Shiyu* State Key Lab of Pulp and Paper Engineering， South China University of Technology， Guangzhou， Guangdong Province， 510640 510640
LI Ming State Key Lab of Pulp and Paper Engineering， South China University of Technology， Guangzhou， Guangdong Province， 510640 510640
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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.
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