期刊
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
卷 60, 期 42, 页码 22900-22907出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202109115
关键词
flame retardants; segmented polyurethanes; sulfur utilization; thermoplastic elastomers
资金
- ENI
- National Science Foundation [CHE-1807395, CHE-1920234]
- RII Research Advancement Grant program
- National Research Foundation of Korea (NRF) - Korea government (MSIT) [2021R1A2C2006167, NRF-2021R1A2B5B01002081]
- National Research Foundation of Korea [2021R1A2C2006167] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
A method for producing high-performance sulfur-based plastics with improved thermomechanical properties, elasticity and flame retardancy has been developed, involving the synthesis of sulfur-based segmented multi-block polyurethanes and thermoplastic elastomers. These materials incorporate a significant amount of sulfur and exhibit controlled tensile strength, elasticity, and enhanced flame retardancy compared to traditional thermoplastic polyurethanes.
The production of elemental sulfur from petroleum refining has created a technological opportunity to increase the valorization of elemental sulfur by the creation of high-performance sulfur based plastics with improved thermomechanical properties, elasticity and flame retardancy. We report on a synthetic polymerization methodology to prepare the first example of sulfur based segmented multi-block polyurethanes (SPUs) and thermoplastic elastomers that incorporate an appreciable amount of sulfur into the final target material. This approach applied both the inverse vulcanization of S-8 with olefinic alcohols and dynamic covalent polymerizations with dienes to prepare sulfur polyols and terpolyols that were used in polymerizations with aromatic diisocyanates and short chain diols. Using these methods, a new class of high molecular weight, soluble block copolymer polyurethanes were prepared as confirmed by Size Exclusion Chromatography, NMR spectroscopy, thermal analysis, and microscopic imaging. These sulfur-based polyurethanes were readily solution processed into large area free standing films where both the tensile strength and elasticity of these materials were controlled by variation of the sulfur polyol composition. SPUs with both high tensile strength (13-24 MPa) and ductility (348 % strain at break) were prepared, along with SPU thermoplastic elastomers (578 % strain at break) which are comparable values to classical thermoplastic polyurethanes (TPUs). The incorporation of sulfur into these polyurethanes enhanced flame retardancy in comparison to classical TPUs, which points to the opportunity to impart new properties to polymeric materials as a consequence of using elemental sulfur.
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