Synthesis and Directed Self-assembly of Cylinder-Forming Poly(styrene-b-lactide) Block Copolymers

doi:10.11944/j.issn.1000-0518.2018.12.180075

Chinese Journal of Applied Chemistry ›› 2018, Vol. 35 ›› Issue (12): 1420-1426.DOI: 10.11944/j.issn.1000-0518.2018.12.180075

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Synthesis and Directed Self-assembly of Cylinder-Forming Poly(styrene-b-lactide) Block Copolymers

ZHANG Xiaosa^a^b,JI Shengxiang^a^*()

^aKey Laboratory of Polymer Ecomaterials,Changchun Institute of Applied Chemistry,Chinese Academy of Sciences,Changchun 130022,China
^bUniversity of Chinese Academy of Sciences,Beijing 100049,China

Received:2018-03-19 Accepted:2018-06-06 Published:2018-12-05 Online:2018-12-05
Contact: JI Shengxiang
Supported by:
Supported by the National Natural Science Foundation of China(No.51773201), the Department of Science and Technology of Jilin Province(No.20160414032GH)

Abstract

Abstract:

Two cylinder-forming poly(styrene-b-lactide)s, poly(styrene-b-D,L-lactide)(PS-b-PDLLA) and poly(styrene-b-L-lactide))(PS-b-PLLA), with similar domain sizes(L_O) were synthesized using ring opening polymerization(ROP) of lactide monomers from hydroxy-terminated polystyrene(PS-OH) with zinc octoate(Sn(Oct)₂) as the catalyst and characterized by nuclear magnetic resonance spectroscopy(NMR), gel permeation chromatography(GPC), differential scanning calorimetry(DSC), thermal gravimetric analyzer(TGA) and small-angle X-ray scattering(SAXS). Thin films of PS-b-PDLLA and PS-b-PLLA were directed to assemble on hexagonal arrays of spot chemical patterns with a range of pattern periods(L_S) under thermal annealing. SEM analysis of the two assembled films revealed that long-range ordered perpendicularly-oriented hexagonal-array cylinders were obtained in both films. The range of L_S window for defect-free assembly of perpendicular cylinders was larger in PS-b-PDLLA films than that in PS-b-PLLA films, which is similar to the assembly behavior of lamellar-forming PS-b-PLA on stripe chemical patterns.

Key words: poly(styrene-b-lactide), block copolymers, directed self-assembly, chemical pattern

ZHANG Xiaosa, JI Shengxiang. Synthesis and Directed Self-assembly of Cylinder-Forming Poly(styrene-b-lactide) Block Copolymers[J]. Chinese Journal of Applied Chemistry, 2018, 35(12): 1420-1426.

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Synthesis and Directed Self-assembly of Cylinder-Forming Poly(styrene-b-lactide) Block Copolymers

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