Chloromethylation and Hydroxymethylation of SEBS

Abstract

Abstract: Hydroxymethyl groups were introduced into hydrogenated poly(styrene-block-butadiene-block-styrene)(SEBS) via chemical modification of the PSblocks by a simple three step procedure, i.e. , chloromethylation via Friedel-Crafts reaction with stannic chloride(SnCl₄) as catalyst in chloroform solution in the presence of trioxane and chlorotrimethylsilane, followed by esterification and hydrolysis by using phase transfer catalyst TBAB.¹H NMR, FTIR, SEC and elemental analysis were employed to characterize the products. The results show that the degree of functionalization could be controlled in the first step, and the convertions of chloromethyl to ester and ester to hydroxyl were complete. Meanwhile molecular weight distribution of the product was still narrow. Crosslinking could be avoided when the polymer concentration was kept lower than its overlap concentration.

Key words: SEBS, Chloromethylation, PTC, Hydroxymethylation

CLC Number:

O631

TrendMD:

SHEN Zhong, ZHANG Yan, XIE Jing-Wei, YANG Yi-Qing. Chloromethylation and Hydroxymethylation of SEBS[J]. Chem. J. Chinese Universities, 1999, 20(5): 827.

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Chloromethylation and Hydroxymethylation of SEBS

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