Thermo-Responsive Polymers-Based on Source-Selective Lignins

Conference · Fri Dec 01 00:00:00 EST 2017

OSTI ID:1557544

Nguyen, Ngoc A.  ^[1]; Meek, Kelly  ^[1]; Barnes, Sietske H. ^[1]; Naskar, Amit K.  ^[1]

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1. ORNL

In this study, thermomechanical properties of hardwood and softwood lignin-nitrile butadiene rubber composites were controlled by a thermal annealing process. The presence of thermally unstable linkages within the selected lignins provides free radical sources for crosslinking reactions. The measured dynamic mechanical properties demonstrated substantial improvement in glass transition temperatures (Tg) and storage moduli (E’) of 50 wt. % softwood lignin- and 50 wt. % hardwood lignin-rubber composites after thermal annealing at 180°C. An increase in Tg of approximately 18°C and more than 230% increasing E’ was achieved after annealing the 50 wt. % hardwood lignin-rubber for 5 h. The chemical crosslinking reactions between lignin-nitrile butadiene rubber and lignin-lignin were characterized by in-situ dynamic mechanical analysis and Fourier transform infrared (FTIR) spectroscopy. A mechanism of crosslinking reactions was revealed.

• Research Organization: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC05-00OR22725
• OSTI ID: 1557544
• Resource Relation: Conference: CAMX 2017 - the composites and advanced materials expo - Orlando, Florida, United States of America - 9/11/2017 4:00:00 AM-
• Country of Publication: United States
• Language: English