Determination and Comparison of Molar Mass Distributions of Substituted Polystyrenes and Block Copolymers Using Thermal Field-Flow Fractionation, Size Exclusion Chromatography and Light Scattering

Ritva Dammert, Matti Jussila, Pertti Vastamäki, Marja-Liisa Riekkola, Franciska Sundholm

Research output: Contribution to journalArticleScientificpeer-review

16 Citations (Scopus)

Abstract

Anionic polymerisations of p-methoxystyrene, p-methylstyrene, p-chlorostyrene and p-cyanostyrene were carried out in tetrahydrofuran (THF) and methylcyclohexane. The block copolymers poly(styrene-b-p-methoxystyrene-b-styrene), poly(styrene-b-p-methylstyrene-b-styrene) and poly(styrene-b-p-cyanostyrene) were also polymerised by using THF as solvent. The initiators included n-butyllithium (n-BuLi) and sodium naphthalenide. The use of both n-BuLi and sodium naphthalenide usually produced higher values of M̄n than were calculated. In the former case this could be explained by the lower reactivity of the initiator, which has been found to aggregate in THF. The molar masses were determined by thermal field-flow fractionation (ThFFF), size exclusion chromatography (s.e.c.) and light scattering (LS). ThFFF and the s.e.c. were used for determining the molar mass distributions. The agreement between the three methods was satisfactory.
Original languageEnglish
Pages (from-to)6273-6280
Number of pages8
JournalPolymer
Volume38
Issue number26
DOIs
Publication statusPublished - 1997
MoE publication typeA1 Journal article-refereed

Keywords

  • synthesis
  • block copolymers
  • control of molar masses

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