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Morphology Study of Polystyrene-Polybutadiene-polycaprolactone (PS-b-PB-b-PCL), Polybutadiene-Polycaprolactone (PB-b-PCL), and Polystyrene-Polycaprolactone (PS-b-PCL) Semicrystalline Block Copolymers

Published online by Cambridge University Press:  02 July 2020

G. Kim ,
C. L. Jackson ,
F. v. Gyldenfeldt ,
V. Balsamo ,
M. Libera ,
R. Stadler  and
C. C. Han
G. Kim
Affiliation:
National Institute of Standards and Technology, Gaithersburg, MD20899
C. L. Jackson
Affiliation:
National Institute of Standards and Technology, Gaithersburg, MD20899
F. v. Gyldenfeldt
Affiliation:
Universitaet Bayreuth, Bayreuth, Germany
V. Balsamo
Affiliation:
Universidade Simon Bolivar, Carcas, Venezuela
M. Libera
Affiliation:
Stevens Institute of Technology, Hoboken, NJ07030
R. Stadler
Affiliation:
Universitaet Bayreuth, Bayreuth, Germany
C. C. Han
Affiliation:
National Institute of Standards and Technology, Gaithersburg, MD20899
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Semicrystalline block copolymers containing one crystalline block, such as PCL, show more complicated morphologies than amorphous block copolymers. This is because the microstructure of semicrystalline block copolymers is determined by the interplay between the microphase-separation temperature, crystallization temperature, and glass transition temperatures of the respective blocks. This paper describes initial results of thermodynamic and kinetic effects associated with microphase separation and crystallization in as-cast semicrystalline (PS)0.62(PCL)0.38, (PB)0.2(PCL)0.8 and (PS)0.35(PB)0.15(PCL)0.5 block copolymers, where the subscripts denote the mass fraction of each block.

Semicrystalline block copolymers (PS-b-PCL with Mn=209,000 g/mol, PB-b-PCL with Mn=146,000 g/mol and PS-b-PB-b-PCL with Mn= 150,000 g/mol) were prepared by anionic polymerization. Films were cast from 5% (mass fraction) solutions in toluene into ∼lmm thick films. A relatively slow solvent evaporation over approximately a 10 d period was achieved by partially covering the dishes containing polymer solutions.

Type
Developments in Measuring Polymer Microstructures
Information
Microscopy and Microanalysis , Volume 4 , Issue S2: Proceedings: Microscopy & Microanalysis '98, Microscopy Society of America 56th Annual Meeting, Microbeam Analysis Society 32nd Annual Meeting, Atlanta, Georgia July 12-16, 1998 , July 1998 , pp. 806 - 807
Copyright
Copyright © Microscopy Society of America

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