Amphiphilic Block Copolymers Containing Regioregular Poly(3‐hexylthiophene) and Poly(2‐ethyl‐2‐oxazoline)

Abstract

Poly(3‐hexylthiophene)‐block‐poly(2‐ethyl‐2‐oxazoline) amphiphilic rod–coil diblock copolymers have been synthesized by a combination of Grignard metathesis (GRIM) and ring‐opening cationic polymerization. Diblock copolymers containing 5, 15, and 30 mol‐% poly(2‐ethyl‐2‐oxazoline) have been synthesized and characterized. The synthesized rod–coil block copolymers display nanofibrillar morphology where the density of the nanofibrills is dependent on the concentration of the poly(2‐ethyl‐2‐oxazoline) coil segment. The conductivity of the diblock copolymers was lowered from 200 to 35 S · cm−1 with an increase in the content of the insulating poly(2‐ethyl‐2‐oxazoline) block. By contrast, the field‐effect mobility decreased by 2–3 orders of magnitude upon the incorporation of the poly(2‐ethyl‐2‐oxazoline) insulating segment.magnified image

Synthesis and characterization of side-chain thermotropic liquid crystalline copolymers containing regioregular poly(3-hexylthiophene)

“…S11 e S16 in supporting information). The field-effect mobilities reported for various P3HT block copolymers vary in the range from 10 À2 to 10 À5 cm 2 V À1 s À1 [34,35,46,47]. However, relatively high hole mobilities were observed for P2 to P4 copolymers even at a low content of semiconducting P3HT block (25.9e50.5 mol-% P3HT).…”

Design Strategies for Functionalized Poly(2-oxazoline)s and Derived Materials

“…The Huisgen's cycloaddition with various alkynes yielded the corresponding triazole mono-or bis-terminated pMeOx. Poly(2-hexylthiophene)s, prepared by Stefan et al using Grignard metathesis (GRIM) and (multi-step) termination with a triflate group, were used as macroinitiators for the CROP of EtOx [54]. Copolymers with 5, 15, and 30 mol % pEtOx displayed nanofibrills with inverse density behavior, meaning that the lowest pEtOx content showed the highest density of nanofibrills.…”

Poly(3-Hexylthiophene) Nanostructured Materials for Organic Electronics Applications

“…47 55 It has been observed that the combination of a good solvent and a non-solvent makes P3HT and its diblock copolymer more ordered in solution. 55 Kiriy proposed the idea that addition of a non-solvent like hexane to chloroform solution of P3HT can lead to a number of aggregated states. 9 Solid aggregates can be filtered out before depositing the material onto devices for further measurements.…”

“…48 49 A rod polymer, typically comprising semiconducting units, is covalently linked to a coil-like insulating segment. [50][51][52][53][54][55] More specifically, rod-coil block copolymers containing P3HT have been used to produce nanofibrillar morphologies where the width of the nanofibrills can be controlled by the degree of polymerization of P3HT, composition of the block copolymer, and the processing conditions. 56 57 Over the past few years, a wide range of rod-coil block copolymers containing P3HT have been reported.…”