Please use this identifier to cite or link to this item: http://scholarbank.nus.edu.sg/handle/10635/67585
Title: Thermal crosslinking of cis-1,4-polybutadiene at ultrahigh pressures
Authors: Zeng, X.-R.
Ko, T.-M. 
Keywords: cis-1,4-polybutadiene
Crosslinking
Microhardness
Solid-state 13C-NMR
Ultrahigh pressure
Issue Date: 28-Mar-1998
Source: Zeng, X.-R.,Ko, T.-M. (1998-03-28). Thermal crosslinking of cis-1,4-polybutadiene at ultrahigh pressures. Journal of Applied Polymer Science 67 (13) : 2131-2140. ScholarBank@NUS Repository.
Abstract: cis-1,4-Polybutadiene (BR) samples, in the absence of crosslinking agents, were simultaneously compressed by ultrahigh pressures (>4.0 GPa) and annealed between 25 and 180°C. The BR samples were crosslinked when the annealing temperatures were above 100°C. The Vickers microhardness of the treated BR increased and the extent of swelling decreased rapidly as the annealing temperature increased, indicating that the crosslinking density increased. Solid-state carbon-13 nuclear magnetic resonance and Fourier transform infrared spectroscopy results showed that some C=C bonds in the BR were opened to form the crosslinking network structures with C-C linkages and that a partial cis-trans isomerization took place during the treatments. Differential scanning calorimetry studies revealed that the glass transition temperature increased and the crystallinity decreased as the annealing temperature increased. When the annealing temperature exceeded 140°C, the treated BR samples lost their rubbery elastic characteristics completely and became brittle materials. © 1998 John Wiley & Sons, Inc.
Source Title: Journal of Applied Polymer Science
URI: http://scholarbank.nus.edu.sg/handle/10635/67585
ISSN: 00218995
Appears in Collections:Staff Publications

Show full item record
Files in This Item:
There are no files associated with this item.

Page view(s)

24
checked on Dec 8, 2017

Google ScholarTM

Check


Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.