Thermal and rheological properties of cellulose-graft-polyacrylamide synthesized by in situ graft copolymerization

• DOI: 10.1039/c3ra41236a
• Publication Date: 2013-05-07T13:07:05Z
• Authors: Yue Zhang; Xinda Li; Haifeng Li; Magdi E. Gibril; Keqing Han; Muhuo Yu
• Keywords: Polyacrylamide; Thermal Stability

In order to prepare a cellulose-based water absorbent material in an environmentally-friendly way, cellulose-graft-polyacrylamide (cellulose-g-PAM) copolymer is synthesized by situ graft copolymerization through co-rotating twin-screw extruder. An ionic liquid, namely 1-N-butyl-3-methylimidazolium chloride, used as the reaction medium and ceric ammonium nitrate initiator. The effect evaluated study of thermal rheological properties copolymers. FTIR elemental analysis results show that amide groups PAM successfully onto cellulose backbone ratio cellulose-g-PAM increased with increase AM content. Thermal shows stability glass transition temperature are increases due formation long-chain branches which disturb segment motion chains. comparison cellulose, dehydration peak displays larger endothermic enthalpy shifts higher temperature. Rheological storage modulus curve high exhibits plateau at low frequency tan δ value, indicating large amount cause entanglement chains improve toughness