MICROSTRUCTURE OF STYRENE-MALEIC ANHYDRIDE COPOLYMERS STUDIED BY 13C NMR

Abstract

Abstract:

Two styrene/maleic anhydride copolymers (St/MAh), H10 and UV4, were prepared by controlled polymerization at 110 ℃, using 1-(ethoxycarbonyl)-prop-1-yl dithiobenzoate (EPDTB) as a chain transfer agent and AIBN as an initiator, and by copolymerization in THF with EPDTB as an initiator under UV irradiation at
room temperature respectively. Normal ¹³C NMR spectra and DEPT135 spectra were measured for both copolymers. All carbon chemical shifts in St/MAh copolymers were assigned. As a comparison, chemical shifts of the main chain carbons were calculated based on the substitution constants for phenyl group of St unit: α=16, β=6, γ=-2, and for anhydride group of MAh: α=13.5, β=2.5, γ=-2. The molar ratio of St to MAh, (F_S/F_M), alternation degree, number-average sequence length of St block, molar ratio of cis- to trans-configuration of MAh ring and numberaverage molecular weight for the samples H10 and UV4 were calculated using integral values of the corresponding peaks. The copolymer UV4 had much higher alternating degree than that of H10, indicating a big influence of polymerization temperature on the formation of alternating structure in the copolymerization of St and MAh.

Key words: ¹³C NMR, styrene/maleic anhydride copolymers, NMR chemical shift, degree of alternation, number-average sequence length

CLC Number:

O641.13

DU Ding-zhun, WU De-cheng, PAN Cai-yuan. MICROSTRUCTURE OF STYRENE-MALEIC ANHYDRIDE COPOLYMERS STUDIED BY ¹³C NMR[J]. Chinese Journal of Magnetic Resonance.

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MICROSTRUCTURE OF STYRENE-MALEIC ANHYDRIDE COPOLYMERS STUDIED BY ¹³C NMR

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