Effect of the copolymer composition on the K and a constants of the Mark-Houwink equation

Styrene-methyl methacrylate random copolymers

C. Y. Hui, Yu-Yun Lin, Costantino Creton

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

This article reports a study of the effect of composition in styrene-methyl methacrylate random copolymers on K and a constants in the Mark-Houwink equation. Copolymers with a variety of compositions and chain lengths were prepared through a controlled free-radical copolymerization, with benzyl diethyldithiocarbamate and tetraethyl thiuram disulfide as iniferters. The synthesized products were analyzed with several techniques, including Fourier transform infrared, 1 H NMR, gel permeation chromatography, and viscometry. By relating the determined constants K and a of various copolymers to their composition, we found that the constant varied nonlinearly with the composition. The constant a decreased with increasing poly(methyl methacrylate) (PMMA) content in the copolymer molecule up to 60 wt %. After that, the constant increased with the PMMA content, reaching the value of the PMMA homopolymer. However, the constant K initially increased with the PMMA content up to a critical composition (60 wt %) and subsequently decreased with further increasing PMMA content. These results suggest that the molecular weight of a polystyrene-PMMA random copolymer of known composition cannot be approximated with a simple linear equation comprising the K and a values of each relevant homopolymers. The aforementioned trends are qualitatively discussed in relation to some possible sequential distribution in the copolymer molecules and the resulting conformation.

Original languageEnglish
Pages (from-to)562-571
Number of pages10
JournalJournal of Polymer Science, Part B: Polymer Physics
Volume40
Issue number6
DOIs
Publication statusPublished - 2002 Mar 15

Fingerprint

Styrene
Methacrylates
Polymethyl Methacrylate
Polymethyl methacrylates
polymethyl methacrylate
styrenes
copolymers
Copolymers
Chemical analysis
Homopolymerization
Thiram
Ditiocarb
viscometry
gel chromatography
Molecules
Polystyrenes
Viscosity measurement
Gel permeation chromatography
disulfides
copolymerization

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Physical and Theoretical Chemistry
  • Polymers and Plastics
  • Materials Chemistry

Cite this

@article{fba9d9951b804e1184f2e87c536e3aee,
title = "Effect of the copolymer composition on the K and a constants of the Mark-Houwink equation: Styrene-methyl methacrylate random copolymers",
abstract = "This article reports a study of the effect of composition in styrene-methyl methacrylate random copolymers on K and a constants in the Mark-Houwink equation. Copolymers with a variety of compositions and chain lengths were prepared through a controlled free-radical copolymerization, with benzyl diethyldithiocarbamate and tetraethyl thiuram disulfide as iniferters. The synthesized products were analyzed with several techniques, including Fourier transform infrared, 1 H NMR, gel permeation chromatography, and viscometry. By relating the determined constants K and a of various copolymers to their composition, we found that the constant varied nonlinearly with the composition. The constant a decreased with increasing poly(methyl methacrylate) (PMMA) content in the copolymer molecule up to 60 wt {\%}. After that, the constant increased with the PMMA content, reaching the value of the PMMA homopolymer. However, the constant K initially increased with the PMMA content up to a critical composition (60 wt {\%}) and subsequently decreased with further increasing PMMA content. These results suggest that the molecular weight of a polystyrene-PMMA random copolymer of known composition cannot be approximated with a simple linear equation comprising the K and a values of each relevant homopolymers. The aforementioned trends are qualitatively discussed in relation to some possible sequential distribution in the copolymer molecules and the resulting conformation.",
author = "Hui, {C. Y.} and Yu-Yun Lin and Costantino Creton",
year = "2002",
month = "3",
day = "15",
doi = "10.1002/polb.10119",
language = "English",
volume = "40",
pages = "562--571",
journal = "Journal of Polymer Science, Part B: Polymer Physics",
issn = "0887-6266",
publisher = "John Wiley and Sons Inc.",
number = "6",

}

TY - JOUR

T1 - Effect of the copolymer composition on the K and a constants of the Mark-Houwink equation

T2 - Styrene-methyl methacrylate random copolymers

AU - Hui, C. Y.

AU - Lin, Yu-Yun

AU - Creton, Costantino

PY - 2002/3/15

Y1 - 2002/3/15

N2 - This article reports a study of the effect of composition in styrene-methyl methacrylate random copolymers on K and a constants in the Mark-Houwink equation. Copolymers with a variety of compositions and chain lengths were prepared through a controlled free-radical copolymerization, with benzyl diethyldithiocarbamate and tetraethyl thiuram disulfide as iniferters. The synthesized products were analyzed with several techniques, including Fourier transform infrared, 1 H NMR, gel permeation chromatography, and viscometry. By relating the determined constants K and a of various copolymers to their composition, we found that the constant varied nonlinearly with the composition. The constant a decreased with increasing poly(methyl methacrylate) (PMMA) content in the copolymer molecule up to 60 wt %. After that, the constant increased with the PMMA content, reaching the value of the PMMA homopolymer. However, the constant K initially increased with the PMMA content up to a critical composition (60 wt %) and subsequently decreased with further increasing PMMA content. These results suggest that the molecular weight of a polystyrene-PMMA random copolymer of known composition cannot be approximated with a simple linear equation comprising the K and a values of each relevant homopolymers. The aforementioned trends are qualitatively discussed in relation to some possible sequential distribution in the copolymer molecules and the resulting conformation.

AB - This article reports a study of the effect of composition in styrene-methyl methacrylate random copolymers on K and a constants in the Mark-Houwink equation. Copolymers with a variety of compositions and chain lengths were prepared through a controlled free-radical copolymerization, with benzyl diethyldithiocarbamate and tetraethyl thiuram disulfide as iniferters. The synthesized products were analyzed with several techniques, including Fourier transform infrared, 1 H NMR, gel permeation chromatography, and viscometry. By relating the determined constants K and a of various copolymers to their composition, we found that the constant varied nonlinearly with the composition. The constant a decreased with increasing poly(methyl methacrylate) (PMMA) content in the copolymer molecule up to 60 wt %. After that, the constant increased with the PMMA content, reaching the value of the PMMA homopolymer. However, the constant K initially increased with the PMMA content up to a critical composition (60 wt %) and subsequently decreased with further increasing PMMA content. These results suggest that the molecular weight of a polystyrene-PMMA random copolymer of known composition cannot be approximated with a simple linear equation comprising the K and a values of each relevant homopolymers. The aforementioned trends are qualitatively discussed in relation to some possible sequential distribution in the copolymer molecules and the resulting conformation.

UR - http://www.scopus.com/inward/record.url?scp=0037087250&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0037087250&partnerID=8YFLogxK

U2 - 10.1002/polb.10119

DO - 10.1002/polb.10119

M3 - Article

VL - 40

SP - 562

EP - 571

JO - Journal of Polymer Science, Part B: Polymer Physics

JF - Journal of Polymer Science, Part B: Polymer Physics

SN - 0887-6266

IS - 6

ER -