摘要
以玉米秸秆的液化产物为原料制备聚氨酯泡沫材料,通过改变发泡剂——水的用量,利用万能材料试验机、差失量热扫描仪(DSC)和热重分析仪(TGA),研究了水用量对聚氨酯泡沫材料机械特性和热特性的影响。研究结果表明,随着水用量的增加,材料的拉伸强度和断裂伸长率都是先增加后降低,最大值分别为1.87MPa和189.7%;材料的起始热分解温度逐渐降低,玻璃化转变温度逐渐增加,转变温度范围变宽。改变水用量可以得到不同性质的聚氨酯泡沫材料。
Polyurethane （PU） foams were successfully prepared from liquefied corn stover polyol by varying the amount of blowing agent---water. The effects of water amount on the mechanical and thermal properties of PU foams were investigated by means of universal tensile machine, differential scanning calorimetry （DSC） and thermogravimetric analysis （TGA）. The results showed that with an increase of water amount, tensile strength and elongation rate at break of the PU foams first increased and then decreased, their maximum values reached 1.87 MPa and 189.7% respectively. Furthermore, with an increase of water amount, the initial decomposition temperature decreased, glass transition temperature increased and the range of glass transition temperature expanded. The properties of PU foams can be changed by varying the amount of water.
出处
《农业工程学报》
EI
CAS
CSCD
北大核心
2009年第1期185-188,共4页
Transactions of the Chinese Society of Agricultural Engineering
基金
国家自然科学基金(3047137)
教育部博士点基金(20060019041)
国家863项目(2008AA05Z302)
关键词
聚氨酯
热分解
发泡剂
玉米秸秆
泡沫
polyurethane, thermal decomposition, blowing agents, corn stover, foams
