Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/99033
標題: Preparation and characteristics of polyurethane made with polyhydric alcohol‐liquefied rice husk
作者: Wen‐Jau Lee
Chao‐Yun Yu
Yi‐Chun Chen
陳奕君
關鍵字: biopolymers and renewable polymers;cellulose and other wood products;foams;polyurethane;thermogravimetric analysis
出版社: Wiley Periodicals
Project: JOURNAL OF APPLIED POLYMER SCIENCE, Volume 135, Issue 8 February 20, 2018 45910
摘要: 
The limited availability of fossil resource is causing the urgent need to get renewable chemicals. Solvent liquefaction can convert rice husk into bio‐based chemicals. Rice husk was liquefied in polyhydric alcohol catalyzed by sulfuric acid under atmospheric pressure. The viscosity, residue content, and weight average molecular weight (Mw) of liquefied rice husk were 3089 cps, 23.6% and 4100, respectively. Prolonging the liquefaction time decreased the residue content and increased the average molecular weight. Polyurethane (PU) foams were successfully prepared from the liquefied rice husk with different molar ratios of NCO to OH (NCO/OH). The mechanical properties of PU foams showed that the compressive strength in the vertical direction is higher than that in the horizontal direction. With Increase of the NCO/OH molar ratio from 1.0 to 2.0, compressive strength in the vertical direction of PU foams increased from 70.6 to 114.7 kPa at 10% strain. Thermal analysis results showed that thermal stability of liquefied rice husk‐based PU resins was better than that of fossil‐ and liquefied wood‐ based PU resins. Increasing the NCO/OH molar ratio and inorganic residue of rice husk can help to increase thermal stability. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 45910.
URI: http://hdl.handle.net/11455/99033
DOI: 10.1002/app.45910
Appears in Collections:森林學系

Files in This Item:
File Description SizeFormat Existing users please Login
32.pdf543.07 kBAdobe PDFThis file is only available in the university internal network    Request a copy
Show full item record
 

Google ScholarTM

Check

Altmetric

Altmetric


Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.