Preprint Article Version 1 This version is not peer-reviewed

Direct Synthesis of a Di-Block Copolymer Syndiotactic Polystyrene-b-Polyethylene

Version 1 : Received: 10 July 2018 / Approved: 11 July 2018 / Online: 11 July 2018 (04:29:48 CEST)

How to cite: Lamparelli, D.H.; Speranza, V.; Camurati, I.; Buonerba, A.; Oliva, L. Direct Synthesis of a Di-Block Copolymer Syndiotactic Polystyrene-b-Polyethylene. Preprints 2018, 2018070188 (doi: 10.20944/preprints201807.0188.v1). Lamparelli, D.H.; Speranza, V.; Camurati, I.; Buonerba, A.; Oliva, L. Direct Synthesis of a Di-Block Copolymer Syndiotactic Polystyrene-b-Polyethylene. Preprints 2018, 2018070188 (doi: 10.20944/preprints201807.0188.v1).

Abstract

The direct synthesis of syndiotactic polystyrene-block-polyethylene copolymer (sPS-b-PE) with di-block structure has been achieved. The synthetic strategy consists of the sequential stereocontrolled polymerization of styrene and ethylene in presence of a single catalytic system: cyclopentadienyltitanium(IV) trichloride activated by modified methylaluminoxane (CpTiCl3/MMAO). The reaction conditions suitable for affording the partially living polymerization of these monomers were identified and the resulting copolymer, purified from contaminant homopolymers, was fully characterized. Gel permeation chromatography coupled with two-dimensional NMR spectroscopy COSY and DOSY confirmed the di-block nature of the obtained polymer whose thermal behaviour and thin film morphology were also investigated, by differential scanning calorimetry, powder wide angle x-ray diffraction and atomic force microscopy.

Subject Areas

syndiotactic polystyrene; polyinsertion catalysis; block copolymer; thin film morphology

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