期刊
JOURNAL OF APPLIED POLYMER SCIENCE
卷 136, 期 37, 页码 -出版社
WILEY
DOI: 10.1002/app.47959
关键词
biopolymers and renewable polymers; biosynthesis of polymers; mechanical properties; polyurethane
资金
- Agencia Nacional de Promocion Cientifica y Tecnologica (Argentina) [PICT 2015 N0475]
We synthesized polyols with high hydroxyl functionalities (F(OH)s), between 9.0 and 12.6, and characterized them with differential scanning calorimetry, thermogravimetric analysis, and size exclusion chromatography after we parametrically studied the ring-opening reaction of epoxidized soybean oil with lactic acid (LA) as a function of the reaction temperature and lactic acid equivalent fraction (f(LA)). An increase of only 20 degrees C in the reaction temperature (from 80 to 100 degrees C) caused changes in the hydroxyl number (+17.8%), F-OH (-25%), viscosity (-14.0%), and oligomeric content (-24.1%). f(LA) mostly affected the ring-opening yield, and only for f(LA) values above 0.4 was possible to achieve values higher than 80%. Rigid polyurethane foams (rPUFs) were synthesized and characterized with scanning electron microscopy, dynamic mechanical analysis (DMA), and compressive mechanical tests. rPUFs with a very high specific compressive strength (7.8 kPa kg(-1) m(3)) were synthesized solely with biobased soybean oil. DMA revealed a compromised relationship between the specific compressive strength and its temperature dependence. To increase the first one, the most relevant method was to increase F-OH. Instead, to increase the latter one, the OH number had to be maximized. (c) 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 47959.
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