Morphology of block copolymers in a selective environment

Denise Freitas Siqueira; Suzana Pereira Nunes

doi:10.1016/0032-3861(94)90501-0

Morphology of block copolymers in a selective environment

Denise Freitas Siqueira, Suzana Pereira Nunes^*

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

13 Scopus citations

Abstract

The morphology of poly(styrene-block-butyl methacrylate) (SBMA) copolymer with 42 wt% S was studied by transmission electron microscopy in a selective environment. Micelles with S cores were observed in dilute solutions in 2-propanol, a non-solvent for S and a theta solvent for the BMA blocks. The solvent influence on the final morphology of SBMA films was investigated. Films obtained from solution in tetrahydrofuran had ordered cylindrical structures. When 10% poly(phenylene oxide) (PPO), which has a preferential interaction with the S blocks, was added to the copolymer, the cylinders turned into spheres with PPO cores separated by the swollen S blocks from a BMA matrix. In PPO/SBMA 50 50 blends multilayer vesicles and lamellar structures coexist. For blends with SBMA content lower than 5%, micelles with BMA cores were observed in a PPO matrix.

Original language	English (US)
Pages (from-to)	490-495
Number of pages	6
Journal	Polymer
Volume	35
Issue number	3
DOIs	https://doi.org/10.1016/0032-3861(94)90501-0
State	Published - Feb 1994
Externally published	Yes

Keywords

block copolymers
morphology
selective solvents

ASJC Scopus subject areas

Materials Chemistry
Polymers and Plastics
Organic Chemistry

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10.1016/0032-3861(94)90501-0

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title = "Morphology of block copolymers in a selective environment",

abstract = "The morphology of poly(styrene-block-butyl methacrylate) (SBMA) copolymer with 42 wt% S was studied by transmission electron microscopy in a selective environment. Micelles with S cores were observed in dilute solutions in 2-propanol, a non-solvent for S and a theta solvent for the BMA blocks. The solvent influence on the final morphology of SBMA films was investigated. Films obtained from solution in tetrahydrofuran had ordered cylindrical structures. When 10% poly(phenylene oxide) (PPO), which has a preferential interaction with the S blocks, was added to the copolymer, the cylinders turned into spheres with PPO cores separated by the swollen S blocks from a BMA matrix. In PPO/SBMA 50 50 blends multilayer vesicles and lamellar structures coexist. For blends with SBMA content lower than 5%, micelles with BMA cores were observed in a PPO matrix.",

keywords = "block copolymers, morphology, selective solvents",

author = "Siqueira, {Denise Freitas} and Nunes, {Suzana Pereira}",

year = "1994",

month = feb,

doi = "10.1016/0032-3861(94)90501-0",

language = "English (US)",

volume = "35",

pages = "490--495",

journal = "Polymer",

issn = "0032-3861",

publisher = "Elsevier B.V.",

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TY - JOUR

T1 - Morphology of block copolymers in a selective environment

AU - Siqueira, Denise Freitas

AU - Nunes, Suzana Pereira

PY - 1994/2

Y1 - 1994/2

N2 - The morphology of poly(styrene-block-butyl methacrylate) (SBMA) copolymer with 42 wt% S was studied by transmission electron microscopy in a selective environment. Micelles with S cores were observed in dilute solutions in 2-propanol, a non-solvent for S and a theta solvent for the BMA blocks. The solvent influence on the final morphology of SBMA films was investigated. Films obtained from solution in tetrahydrofuran had ordered cylindrical structures. When 10% poly(phenylene oxide) (PPO), which has a preferential interaction with the S blocks, was added to the copolymer, the cylinders turned into spheres with PPO cores separated by the swollen S blocks from a BMA matrix. In PPO/SBMA 50 50 blends multilayer vesicles and lamellar structures coexist. For blends with SBMA content lower than 5%, micelles with BMA cores were observed in a PPO matrix.

AB - The morphology of poly(styrene-block-butyl methacrylate) (SBMA) copolymer with 42 wt% S was studied by transmission electron microscopy in a selective environment. Micelles with S cores were observed in dilute solutions in 2-propanol, a non-solvent for S and a theta solvent for the BMA blocks. The solvent influence on the final morphology of SBMA films was investigated. Films obtained from solution in tetrahydrofuran had ordered cylindrical structures. When 10% poly(phenylene oxide) (PPO), which has a preferential interaction with the S blocks, was added to the copolymer, the cylinders turned into spheres with PPO cores separated by the swollen S blocks from a BMA matrix. In PPO/SBMA 50 50 blends multilayer vesicles and lamellar structures coexist. For blends with SBMA content lower than 5%, micelles with BMA cores were observed in a PPO matrix.

KW - block copolymers

KW - morphology

KW - selective solvents

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U2 - 10.1016/0032-3861(94)90501-0

DO - 10.1016/0032-3861(94)90501-0

M3 - Article

AN - SCOPUS:0011437861

SN - 0032-3861

VL - 35

SP - 490

EP - 495

JO - Polymer

JF - Polymer

IS - 3

ER -

Morphology of block copolymers in a selective environment

Abstract

Keywords

ASJC Scopus subject areas

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