Graft chain propagation rate coefficients of acrylic acid in melt graft copolymerization with linear low density polyethylene |
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| Authors: | Qiang Shi Chuan-Lun Cai Giovanna Costa |
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| Affiliation: | a State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, ChangChun 130022, China
b Istituto per Lo Studio delle Macromolecole, Consiglio Nazionale delle Ricerche, Via de Marini 6, 16149 Genova, Italy |
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| Abstract: | Graft chain propagation rate coefficients (kp,g) for grafting AA onto linear low density polyethylene (LLDPE) in the melt in ESR tubes have been measured via Fourier transform infrared (FTIR) spectroscopy and electron spin resonance (ESR) spectroscopy in the temperature range from 130 to 170 °C. To exclude the effect of homopolymerization on the grafting, the LLDPE was pre-irradiated in the air by electron beam to generate the peroxides and then treated with iodide solution to eliminating one kind of peroxides, hydroperoxide. The monomer conversion is determined by FTIR and the chain propagation free-radical concentration is deduced from the double integration of the well-resolved ESR spectra, consisting nine lines in the melt. The temperature dependence of kp,g is expressed: |
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| Keywords: | Graft copolymerization Chain propagation rate coefficient ESR |
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