Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5200927 | Polymer Degradation and Stability | 2017 | 24 Pages |
Abstract
The presence of cross-linked networks in rubber creates a tremendous problem for recycling and reusing of waste rubber. Fast transformation of cross-linked natural rubber (NR) into liquid natural rubber was carried out by light pyrolysis in temperature range from 240 to 300 °C in variable time (in range: 1-30 min). The transformation efficiency was evaluated by measuring the sol fraction and the cross-link density of the gel fraction. Over 80 wt% sol fraction was obtained at 280 °C in 15 min and 100 wt% sol fraction was obtained at 300 °C in 3 min. The chemical structure of sol fraction was characterized by gel permeation chromatography, nuclear magnetic resonance and infrared spectroscopy. The molecular weight of sol fraction in cross-linked NR processed at 280 °C and 300 °C decreased when gel fraction is over 50%. The nuclear magnetic resonance results showed that mono-sulfidic linkages occurred mainly in the sol fraction of liquid NR obtained at 300 °C. Isomerization from cis to trans form of isoprene unit in NR increased with extending pyrolysis time.
Related Topics
Physical Sciences and Engineering
Chemistry
Organic Chemistry
Authors
Xiaoyu Wu, Krzysztof Formela, Raqiqa tur Rasool, Shifeng Wang,