The Open UniversitySkip to content
 

Shear-Induced Crystallization in blends of Model Linear and Long-Chain Branched Hydrogenated Polybutadienes

Heeley, Ellen L.; Fernyhough, Christine M.; Graham, Richard S.; Olmsted, Peter D.; Inkson, Nathanael J.; Embery, John; Groves, David J.; McLeish, Tom C.B.; Morgovan, Ariana C.; Meneau, Florian; Bras, Wim and Ryan, Anthony J. (2006). Shear-Induced Crystallization in blends of Model Linear and Long-Chain Branched Hydrogenated Polybutadienes. Macromolecules, 39(15) pp. 5058–5071.

URL: http://pubs.acs/cgi-bin/article.cgi/mamobx/2006/39...
DOI (Digital Object Identifier) Link: http://dx.doi.org/10.1021/ma0606307
Google Scholar: Look up in Google Scholar

Abstract

Quiescent and shear-induced crystallizations were performed on several well-defined linear
monodisperse hydrogenated polybutadiene blends with a high-molecular-weight long-chain branched (LCB) combshaped
additive. The connection between microscopic molecular motion and crystallization kinetics has been
quantitatively studied with respect to the formation of either isotropic or oriented shish kebab crystal morphology
using time-resolved X-ray scattering techniques. Using a constant preshear rate, the addition of small amounts of
LCB combs to the sample blends, at concentrations below and just above the overlap concentration c*, has
significantly increased the crystallization rates compared to quiescent conditions. However, only one blend showed
the formation of an oriented shish kebab morphology. Also, for these model blends, the transition between isotropic
and oriented crystals occurs quite sharply between 5 and 10%, which is around c*. We explain these data by
using a shish formation mechanism in which, to form shish kebabs, the combs must be mutually overlapping and
the comb Weissenberg number must be in the strong stretch regime.

Item Type: Journal Article
ISSN: 0024-9297
Keywords: Some of the symbols may not have transferred correctly into this bibliographic record and/or abstract.
Academic Unit/Department: Science > Life, Health and Chemical Sciences
Item ID: 6061
Depositing User: Ellen Heeley
Date Deposited: 19 Dec 2006
Last Modified: 02 Dec 2010 19:55
URI: http://oro.open.ac.uk/id/eprint/6061
Share this page:

Altmetrics

Scopus Citations

Actions (login may be required)

View Item
Report issue / request change

Policies | Disclaimer

© The Open University   + 44 (0)870 333 4340   general-enquiries@open.ac.uk