Details

Autor(en) / Beteiligte

• Shi, Qiang
• Cai, Chuan-Lun
• Zhu, Lian-Chao
• Yin, Jing-Hua

Titel

Chain Propagation Kinetics on Melt Grafting Reaction

Ist Teil von

• Macromolecular chemistry and physics, 2007-08, Vol.208 (16), p.1803-1812

Ort / Verlag

Weinheim: WILEY-VCH Verlag

Erscheinungsjahr

2007

Quelle

Wiley Online Library

Beschreibungen/Notizen

• Graft copolymerization in the molten state is of fundamental importance as a probe of chemical modification and reactive compatibilization. However, few grafting kinetic studies on reactive extrusion have been carried out because of the inherent difficulties, as expected. In this work, we have studied chain propagation kinetics on melt grafting using pre‐irradiated linear low density polyethylene (LLDPE) and three monomers, acrylic acid (AA), methacrylic acid (MAA), and methyl methacrylate (MMA), as the model system. We measured the apparent chain propagation rate coefficients of grafting (kp,g) and homopolymerization (kp,h) at an initial stage for the melt grafting by FT‐IR spectroscopy and electron spin resonance spectroscopy. It was observed that the convective mixing affected the rate coefficients. The magnitude of kp,h and kp,g were in the same order, but kp,h was slightly larger than kp,g. The kp,g of the three grafting systems increased in the order: LLDPE/MMA < LLDPE/MAA < LLDPE/AA. These results are explained in terms of phase separation, solubility, and inherent reactivity of the monomer.