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Green Preparation of Straw Fiber Reinforced Hydrolyzed Soy Protein Isolate/Urea/Formaldehyde Composites for Biocomposite Flower Pots Application

by Enhui Sun 1,2,†, Guangfu Liao 3,†, Qian Zhang 4, Ping Qu 1,2, Guofeng Wu 1,2, Yueding Xu 1,2, Cheng Yong 1,2 and Hongying Huang 1,2,*
1
Circular Agriculture Research Center, Jiangsu Academy of Agricultural Science, Nanjing 210014, China
2
Jiangsu Agricultural Waste Treatment and Recycle Engineering Research Center, Nanjing 210014, China
3
School of Materials Science and Engineering, PCFM Lab, Sun Yat-sen University, Guangzhou 510275, China
4
Dynea (Nanjing) Chemistry Co., Ltd., Nanjing 210014, China
*
Author to whom correspondence should be addressed.
These two authors contributed equally to this work.
Materials 2018, 11(9), 1695; https://doi.org/10.3390/ma11091695
Received: 31 July 2018 / Revised: 6 September 2018 / Accepted: 7 September 2018 / Published: 12 September 2018
(This article belongs to the Special Issue Magnetostrictive Composite Materials)
The effects of soil burial on the biodegradation of biocomposite flower pots (BFP) made from straw fiber (SF) and hydrolyzed soy protein isolate/urea/formaldehyde (HSPI/U/F) copolymer resin were studied in detail. The microstructure, crystallinity, functional groups, mechanical, degradation and thermal property of the prepared SF with HSPI/U/F copolymer resin have been studied, and the degradation mechanism was also elucidated. XRD results showed that the bond breakage between SF and HSPI/U/F copolymer resin induced a decrease in relative degradation-resistant crystal structures. FTIR spectra showed that the methylolated HSPI units could form a cross-linking network with U/F and SF. The BFP degradation after soil burial was mainly attributed to the effects of microorganisms. The degradation products were environmentally friendly, because they were degradable and could fertilize the soil. In addition, the U/F adhesives were slightly degraded by the microorganisms due to the HSPI in the pots. The TG and DSC results showed that the molecular motion of the BFP matrix could be restricted by the degradation action and the content of HSPI, resulting in decreased crystallization enthalpy and showing good thermal property. The tensile strength of different reinforced samples was not significantly reduced in comparison to U/F resin, and still kept good mechanical performance. Thus, the prepared SF reinforced HSPI/U/F copolymer resins could have good potential for use in the field of biodegradable flower pots because of their good thermal property, mechanical property, biodegradability, and relatively low cost. View Full-Text
Keywords: biodegradable polymers; mechanical property; thermal property; degradation property; biocomposite flower pots application biodegradable polymers; mechanical property; thermal property; degradation property; biocomposite flower pots application
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MDPI and ACS Style

Sun, E.; Liao, G.; Zhang, Q.; Qu, P.; Wu, G.; Xu, Y.; Yong, C.; Huang, H. Green Preparation of Straw Fiber Reinforced Hydrolyzed Soy Protein Isolate/Urea/Formaldehyde Composites for Biocomposite Flower Pots Application. Materials 2018, 11, 1695.

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