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Grafting of 2‐Hydroxyethyl Methacrylate onto Isotactic Poly(propylene) Using Supercritical CO 2 as a Solvent and Swelling Agent
Author(s) -
Li Dan,
Han Buxing,
Liu Zhimin
Publication year - 2001
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/1521-3935(20010701)202:11<2187::aid-macp2187>3.0.co;2-g
Subject(s) - polymer chemistry , tacticity , materials science , differential scanning calorimetry , methacrylate , supercritical carbon dioxide , grafting , benzoyl peroxide , supercritical fluid , monomer , swelling , polymerization , fourier transform infrared spectroscopy , (hydroxyethyl)methacrylate , radical polymerization , polymer , chemical engineering , chemistry , composite material , organic chemistry , physics , thermodynamics , engineering
Grafting of 2‐hydroxyethyl methacrylate (2‐HEMA) onto isotactic polypropylene (iPP) was carried out by free‐radical polymerization using supercritical carbon dioxide (SC CO 2 ) as a solvent and swelling agent. The iPP film was first impregnated with the monomer 2‐HEMA and initiator benzoyl peroxide (BPO) with SC CO 2 at 308.15 K. After releasing CO 2 , the 2‐HEMA molecules in the film were grafted onto the iPP at a higher reaction temperature. By this method, the grafting level and the morphology can be controlled by soaking time, pressure, concentrations of 2‐HEMA and BPO, reaction temperature, and reaction time. The products were characterized by Fourier transform infrared spectroscopy (FT‐IR), scanning electron microscopy (SEM), and differential scanning calorimetry (DSC). Contact angle measurements of 2‐HEMA grafted iPP film using water as the test liquid showed a significant improvement of the surface polarity. The polymer films, having a markedly bumpy texture, were obtained under suitable conditions.