Effect of temperature and solvent on polymer tacticity in the free-radical polymerization of styrene and methyl methacrylate

Leesa M. Smith; Michelle L. Coote

doi:10.1002/pola.26745

Effect of temperature and solvent on polymer tacticity in the free-radical polymerization of styrene and methyl methacrylate

Leesa M. Smith, Michelle L. Coote^*

^*Corresponding author for this work

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

24 Citations (Scopus)

Abstract

The effect of temperature and solvent on polymer tacticity in free-radical polymerization of styrene and methyl methacrylate was studied by ¹³C and ¹H NMR, respectively. Polystyrene shows a mild syndiotactic tendency (P_m = 0.36 ± 0.02) that is independent of temperature over a wide range (-10 to 120°C), while poly(methyl methacrylate) shows a stronger syndiotactic tendency (P_m = 0.17 ± 0.01 at 30°C) that decreases as temperature is increased (P_m = 0.22 ± 0.02 at 80°C). None of the polymerization solvents studied (bulk, THF, DMF, DMSO, acetonitrile, and acetone) had a significant effect on polymer tacticity in either system. The triad fractions of both polymers showed deviations from the Bernoulli model, implying that the antepenultimate unit affects the propagation reaction.

Original language	English
Pages (from-to)	3351-3358
Number of pages	8
Journal	Journal of Polymer Science, Part A: Polymer Chemistry
Volume	51
Issue number	16
DOIs	https://doi.org/10.1002/pola.26745
Publication status	Published - 15 Aug 2013

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title = "Effect of temperature and solvent on polymer tacticity in the free-radical polymerization of styrene and methyl methacrylate",

abstract = "The effect of temperature and solvent on polymer tacticity in free-radical polymerization of styrene and methyl methacrylate was studied by 13C and 1H NMR, respectively. Polystyrene shows a mild syndiotactic tendency (Pm = 0.36 ± 0.02) that is independent of temperature over a wide range (-10 to 120°C), while poly(methyl methacrylate) shows a stronger syndiotactic tendency (Pm = 0.17 ± 0.01 at 30°C) that decreases as temperature is increased (Pm = 0.22 ± 0.02 at 80°C). None of the polymerization solvents studied (bulk, THF, DMF, DMSO, acetonitrile, and acetone) had a significant effect on polymer tacticity in either system. The triad fractions of both polymers showed deviations from the Bernoulli model, implying that the antepenultimate unit affects the propagation reaction.",

keywords = "poly(methyl methacrylate), polystyrene, radical polymerization, solvent effects, syndiotactic, tacticity",

author = "Smith, \{Leesa M.\} and Coote, \{Michelle L.\}",

year = "2013",

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doi = "10.1002/pola.26745",

language = "English",

volume = "51",

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journal = "Journal of Polymer Science, Part A: Polymer Chemistry",

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publisher = "John Wiley \& Sons Inc.",

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TY - JOUR

T1 - Effect of temperature and solvent on polymer tacticity in the free-radical polymerization of styrene and methyl methacrylate

AU - Smith, Leesa M.

AU - Coote, Michelle L.

PY - 2013/8/15

Y1 - 2013/8/15

N2 - The effect of temperature and solvent on polymer tacticity in free-radical polymerization of styrene and methyl methacrylate was studied by 13C and 1H NMR, respectively. Polystyrene shows a mild syndiotactic tendency (Pm = 0.36 ± 0.02) that is independent of temperature over a wide range (-10 to 120°C), while poly(methyl methacrylate) shows a stronger syndiotactic tendency (Pm = 0.17 ± 0.01 at 30°C) that decreases as temperature is increased (Pm = 0.22 ± 0.02 at 80°C). None of the polymerization solvents studied (bulk, THF, DMF, DMSO, acetonitrile, and acetone) had a significant effect on polymer tacticity in either system. The triad fractions of both polymers showed deviations from the Bernoulli model, implying that the antepenultimate unit affects the propagation reaction.

AB - The effect of temperature and solvent on polymer tacticity in free-radical polymerization of styrene and methyl methacrylate was studied by 13C and 1H NMR, respectively. Polystyrene shows a mild syndiotactic tendency (Pm = 0.36 ± 0.02) that is independent of temperature over a wide range (-10 to 120°C), while poly(methyl methacrylate) shows a stronger syndiotactic tendency (Pm = 0.17 ± 0.01 at 30°C) that decreases as temperature is increased (Pm = 0.22 ± 0.02 at 80°C). None of the polymerization solvents studied (bulk, THF, DMF, DMSO, acetonitrile, and acetone) had a significant effect on polymer tacticity in either system. The triad fractions of both polymers showed deviations from the Bernoulli model, implying that the antepenultimate unit affects the propagation reaction.

KW - poly(methyl methacrylate)

KW - polystyrene

KW - radical polymerization

KW - solvent effects

KW - syndiotactic

KW - tacticity

UR - https://www.scopus.com/pages/publications/84879838657

U2 - 10.1002/pola.26745

DO - 10.1002/pola.26745

M3 - Article

SN - 0887-624X

VL - 51

SP - 3351

EP - 3358

JO - Journal of Polymer Science, Part A: Polymer Chemistry

JF - Journal of Polymer Science, Part A: Polymer Chemistry

IS - 16

ER -

Effect of temperature and solvent on polymer tacticity in the free-radical polymerization of styrene and methyl methacrylate

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