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Kinetics Study on Melt Grafting Copolymerization of LLDPE with Acid Monomers Using Reactive Extrusion (Articolo in rivista)
- Type
- Label
- Kinetics Study on Melt Grafting Copolymerization of LLDPE with Acid Monomers Using Reactive Extrusion (Articolo in rivista) (literal)
- Anno
- 2006-01-01T00:00:00+01:00 (literal)
- Alternative label
Shi Q., Zhu L., Cai CL., Yin JH., Costa G. (2006)
Kinetics Study on Melt Grafting Copolymerization of LLDPE with Acid Monomers Using Reactive Extrusion
in Journal of applied polymer science (Print)
(literal)
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
- Shi Q., Zhu L., Cai CL., Yin JH., Costa G. (literal)
- Pagina inizio
- Pagina fine
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
- Rivista
- Note
- ISI Web of Science (WOS) (literal)
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
- Giovanna Costa: CNR Ismac Ge
Qiang Shi,Lianchao Zhu, ChuanLun Cai,JingHua Yin: State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy, China
of Sciences, Changchun 130022, Peoples Republic of China (literal)
- Titolo
- Kinetics Study on Melt Grafting Copolymerization of LLDPE with Acid Monomers Using Reactive Extrusion (literal)
- Abstract
- ABSTRACT: Graft copolymerization in the molten state is
of fundamental importance as a probe of chemical modification
and reactive compatibilization. However, few grafting
kinetics studies on reactive extrusion were carried out
for the difficulties as expected. In this work, the macromolecular
peroxide-induced grafting of acrylic acid and methyl
methacrylate onto linear low density polyethylene by reactive
extrusion was chosen as the model system for the kinetics
study; the samples were taken out from the barrel at
five ports along screw axis and analyzed by FTIR, 1H NMR,
and ESR. For the first time, the time-evolution of reaction
rate, the reaction order, and the activation energy of graft
copolymerization and homopolymerization in the twin
screw extruder were directly obtained. On the basis of these
results, the general reaction mechanism was tentatively proposed.
It was demonstrated that an amount of chain propagation
free radicals could keep alive for several minutes
even the peroxides completely decomposed and the addition
of monomer to polymeric radicals was the rate-controlled
step for the graft copolymerization. The results presented
here revealed that the relative importance of graft
copolymerization compared with homopolymerization
mainly depended on the monomer solubility and reactivity,
while the process parameters such as reaction temperature
also influenced the reaction tendency. (literal)
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