Nanocrystalline Cellulose Grafted Random Copolymers of N-isopropylacrylamide and Acrylic acid Synthesized by RAFT Polymerization

Free and nanocrystalline cellulose (NCC) attached homopolymers of N-isopropylacrylamide and acrylic acid(AA) as temperature- and pH-sensitive materials and also their dual-sensitive copolymers with different contents of AAwere synthesized by reversible addition fragmentation chain transfer polymerization. NCCs were obtained frommicrocrystalline cellulose by an acid hydrolysis process. Then, surface of NCC was chemically modified by 2-(dodecylthiocarbonothioylthio)-2-methylpropionic acid (DDMAT) as chain transfer agent. In situ synthesis of polymersin the presence of 1 wt% of NCC was carried out at 70 °C via R-group approach. Successful attachment of DDMAT andpolymer chains on the backbone of NCC was studied by Fourier transform infrared and hydrogen nuclear magneticresonance

کلیدواژه ها:

Nanocrystalline cellulose ، N-isopropylacrylamide ، Acrylic acid ، RAFT polymerization