Poly(p-maleimidostyrene) as a macromolecule initiator for polymerization of styrene-type monomers – Synthesis of block copolymers containing poly(p-maleimidostyrene) with highly reactive pendent maleimido groups
✍ Scribed by Shigeo Kuroda; Tokio Hagiwara
- Publisher
- Elsevier Science
- Year
- 2010
- Tongue
- English
- Weight
- 492 KB
- Volume
- 51
- Category
- Article
- ISSN
- 0032-3861
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✦ Synopsis
a b s t r a c t 4-Substituted styrenes (substituent: methoxy, methyl, acetoxy, maleimido and none), were cationically polymerized with an initiator system involving poly(p-maleimidostyrene)(PMS) as a macroinitiator, having highly reactive pendent maleimide moieties and a a-chlorobenzyl structure at the polymer end.
Using PMS/SnCl 4 /tetra-n-butylammmonium chloride initiator system, block copolymers of 4-substituted styrenes onto PMS were obtained in CH 2 Cl 2 at 0 C. As for the polymerization of N-(4-vinylphenyl) maleimide and 4-acetoxystyrene, especially, PMS as the macroinitiator was almost completely utilized for initiation reaction and the polymers having PMS-b-poly(4-substituted styrene) platform with very narrow and unimodal molecular weight distribution were formed in contrast with the case of using 4-methoxystyrene and 4-methylstyrene with stronger electron releasing groups, in which the molecular weight distributions of the formed polymeric materials appeared to be bimodal.