| 英文摘要 |
Nowadays, more than 100 thousand waste tires are generated annually in Taiwan. This causes two major problems: the wastage of valuable rubbers and the disposal of waste tires leading to environmental pollution. Two major approaches can be carried out to solve this problem are the recycle and the reuse of waste tire, and the reclaim of rubber raw materials. Thus, a novel recovery technique was developed to fabricate polymer membranes from waste tires for use in gas separation.
The waste tire, consisting with rubber, is one kind of thermosetting materials, which is cross-linked on processing and molding, and therefore cannot be softened or remolding by heating again. Thus, the technology for recycle of waste tire is complex and less viable commercially. However, recently, Reclaiming of rubber by physical, chemical, biotechnological, and de-link processes have been developed. Reclaiming of scrap rubber products is the conversion of a three dimensionally interlinked, insoluble and infusible strong thermosetting polymer to a two dimensional, soft, plastic, tackier, low modulus and vulcanizable essentially thermoplastic product, reclaimed rubber. Reusing or incorporation of reclaim rubber into new rubber compound, not only reduces the cost of the finished product but also saves our united resource of fossil feed stock.
In the first year of this project, the reclaimed rubber was used as the precursor for polymeric membrane fabricated. In this year, the reclaimed rubber was further used to prepare porous carbon membrane by carbonization process to enhance the gas separation performance. The effects of casting dope composition, additive and carbonization condition on the membrane morphology and permeability were investigated. The results indicates that the reclaimed rubber-derived carbon membrane have the potential for H2 purification and CO2 capture in pre-combustion treatment. The micro-porous structure of membrane could be modified by the adding of cross-linking agent and blending agent, resulting in the increase in high selectivity for H2/CO2. A rubber-derived carbon membrane (7A-1h-250) exhibited H2 permeance of about 1333~1825 GP and H2/CO2 selectivity of about3.8~4.0；D rubber-derived carbon membrane (5D-1h-400) showed H2 permeance of about 3258~4091 GPU and H2/CO2 selectivity of3.15~3.93 .
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