Tailor-made polyfluoroacrylate and its block copolymer by RAFT polymerization in miniemulsion; improved hydrophobicity in the core-shell block copolymer

被引:31
作者
Chakrabarty, Arindam [1 ]
Singha, Nikhil K. [1 ]
机构
[1] Indian Inst Technol, Ctr Rubber Technol, Kharagpur 721302, W Bengal, India
关键词
Fluoroacrylate; Miniemulsion; RAFT polymerization; Core-shell morphology; FRAGMENTATION CHAIN-TRANSFER; FLUORINATED POLYACRYLATE LATEX; FREE-RADICAL POLYMERIZATION; EMULSION POLYMERIZATION; SURFACE-PROPERTIES; CONVENTIONAL EMULSION; METHYL-METHACRYLATE; ACRYLATE; DIBLOCK; STYRENE;
D O I
10.1016/j.jcis.2013.07.031
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Controlled/living radical polymerization (CRP) of a fluoroacrylate was successfully carried out in mini-emulsion by Reversible Addition Fragmentation chain Transfer (RAFT) process. In this case, 2,2,3,3,4,4,4-heptafluorobutyl acrylate (HFBA) was polymerized using 2-cyanopropyl dodecyl trithiocarbonate (CPDTC) as RAFT agent, Triton X-405 and sodium dodecyl sulfonate (SDS) as surfactant, and potassium persulphate (KPS) or 2,2'-azobis isobutyronitrile (AIBN) as initiator. Being compatible with hydrophobic fluoroacrylate, this RAFT agent offered very high conversion and good control over the molecular weight of the polymer. The miniemulsion was stable without any costabilizer. The long chain dodecyl group (-C12H25) (Z-group in the RAFT agent) had beneficial effect in stabilizing the miniemulsion. When 2-cyano 2-propyl benzodithioate (CPBD) (Z = -C6H5) was used as RAFT agent, the conversion was less and particle size distribution was very broad. Block copolymerization with butyl acrylate (BA) using PHFBA as macro-RAFT agent showed core-shell morphology with the aggregation of PHFBA segment in the shell. GPC as well as DSC analysis confirmed the formation of block copolymer. The core-shell morphology was confirmed by TEM analysis. The block copolymers (PHFBA-b-PBA) showed significantly higher water contact angle (WCA) showing much better hydrophobicity compared to PHFBA alone. (C) 2013 Elsevier Inc. All rights reserved.
引用
收藏
页码:66 / 74
页数:9
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