由液化玉米秸秆与多亚甲基多苯基多异氰酸酯制备的聚氨酯泡沫的力学性能。

Mechanical properties of polyurethane foams prepared from liquefied corn stover with PAPI.

作者信息

Wang Tipeng, Zhang Lianhui, Li Dong, Yin Jun, Wu Sha, Mao Zhihuai

机构信息

College of Engineering, China Agricultural University, P.O. Box 50, 17 Qinghua Donglu, Beijing 100083, PR China.

出版信息

Bioresour Technol. 2008 May;99(7):2265-8. doi: 10.1016/j.biortech.2007.05.003. Epub 2007 Jul 2.

DOI:10.1016/j.biortech.2007.05.003

PMID:17604162

Abstract

Corn stover was liquefied by using ethylene carbonate (EC) as liquefying solvent and 97% sulfur acid as catalyst at 170 degrees C for 90 min. Polyurethane (PU) foams were prepared from liquefied corn stover (LCS) with variable amount of polymethylene polyphenylisocyanate (PAPI) by one-shot method, with water as blowing agent, silicone as surfactant and triethylamine and dibutyltine dilaurate as co-catalyst. The mechanical properties of LCS-PU foam with different [NCO]/[OH] ratio were studied on a universal tensile tester. With the increase of [NCO]/[OH] ratio from 0.4 to 1.0, the tensile strength and Young's modulus of the LCS-PU foam first raised, reached their maximum values at [NCO]/[OH] ratio of 0.8, and then declined; while the elongation at break decreased from 117% to 3.6%. The results indicated that by changing the [NCO]/[OH] ratio, mechanical properties of LCS-PU foams could be adjusted for various end uses.

摘要

以碳酸乙烯酯（EC）为液化溶剂、97%硫酸为催化剂，在170℃下将玉米秸秆液化90分钟。采用一步法，以水为发泡剂、有机硅为表面活性剂、三乙胺和二月桂酸二丁基锡为共催化剂，由不同用量的多亚甲基多苯基异氰酸酯（PAPI）与液化玉米秸秆（LCS）制备聚氨酯（PU）泡沫。在万能拉伸试验机上研究了不同[NCO]/[OH]比的LCS-PU泡沫的力学性能。随着[NCO]/[OH]比从0.4增加到1.0，LCS-PU泡沫的拉伸强度和杨氏模量先升高，在[NCO]/[OH]比为0.8时达到最大值，然后下降；而断裂伸长率从117%降至3.6%。结果表明，通过改变[NCO]/[OH]比，可以针对不同的最终用途调整LCS-PU泡沫的力学性能。