Preparation of a novel HALS polypropylene stabilizer |
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Authors: | Kenneth Ekman,Lars Ekholm,Jan H. N sman |
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Affiliation: | Kenneth Ekman,Lars Ekholm,Jan H. Näsman |
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Abstract: | The radiation induced graft copolymerization of m-isopropenyl-α,α-dimethyl benzyl iso-cyanate (m-TMI) and styrene onto polypropylene was carried out. The extent of grafting increased with increasing amount of styrene and with increased radiation dose. A graft load of 180% was obtained by immersing a 50 kGy pre-irradiated film in a monomer solution containing 25 mol % m-TMI and 75 mol % styrene. The graft copolymer is suitable for covalently binding nonpolymerizable stabilizers with a suitable nucleophilic moiety. In this work the isocyanate moiety of the graft copolymer was allowed to react with 4-amino-2,2,6,6-tetramethyl piperidine, a hindered amine light stabilizer. Fourier trans-formed infrared spectroscopy confirmed the formation of an urea moiety. © 1995 John Wiley & Sons, Inc. |
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Keywords: | radiation grafting HALS reactive processing m-isopropenyl-α ,α -dimethyl benzyl isocyanate |
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