Thermodynamic Behavior of Poly(cyclohexylethylene) in Polyolefin Diblock Copolymers

We report the temperature dependence of the Flory−Huggins interaction parameter for three symmetric diblock copolymer systems containing poly(cyclohexylethylene) (PCHE):  poly(cyclohexylethylene-b-ethylene) (CE), poly(cyclohexylethylene-b-ethylethylene) (CEE), and poly(cyclohexylethylene-b-ethylenep...

Full description

Saved in:
Bibliographic Details
Published in:Macromolecules 2002-09, Vol.35 (19), p.7368-7374
Main Authors: Cochran, Eric W, Bates, Frank S
Format: Article
Language:English
Subjects:
Applied sciences
Exact sciences and technology
Organic polymers
Physicochemistry of polymers
Properties and characterization
Thermal and thermodynamic properties
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:We report the temperature dependence of the Flory−Huggins interaction parameter for three symmetric diblock copolymer systems containing poly(cyclohexylethylene) (PCHE):  poly(cyclohexylethylene-b-ethylene) (CE), poly(cyclohexylethylene-b-ethylethylene) (CEE), and poly(cyclohexylethylene-b-ethylenepropylene) (CP). Order−disorder transition temperatures (T ODT) were determined using dynamic mechanical spectroscopy and interpreted with mean-field theory, (χN)ODT = 10.5, leading to well-defined expressions for χ(T). These results have been analyzed in the context of solubility parameter (δ) theory resulting in a unique parameter δC that describes the interactions in CE, CP, and CEE, where δC < δE E < δP < δE with (δE − δC) ≈ 1.6 MPa1/2 at 500 K. In contrast to the predictions of group contribution theory, this indicates that δC is in surprisingly close proximity to the solubility parameter for poly(dimethylsiloxane).
ISSN:0024-9297
1520-5835
DOI:10.1021/ma020227+