摘要
在适当的条件下，用ＳＯ＿２－二乙胺（ＤＥＡ）－二甲亚砜（ＤＭＳＯ）处理木材并进行酯化改性，可使木材纤维素完全消晶，软化点（Ｔ＿３）下降到２６０℃左右，形变率达７０％，热稳定性变差，压片的脆性较大；如果用多聚甲醛（ＰＭＯ）－ＤＭＳＯ处理并进行酯化改性，木材的Ｔ＿３大约为１８０℃，形变率为４０％，热稳定性无明显变化，压片的韧性较好。两种酯化木材经热塑成型后都能得到半透明的塑性压片。
The wood powder samples were softened at about 300℃ after treatment with amixture of sulfuric dioxide-diethvlamine-dimethyl sulfoxide(SO_2-DEA-DMSO ).Afteresterification with a mixture of pyridine and acetic anhydride the samples showed a softeningpoint of 260℃ and deformation of 70%,these values were 180℃ and 40%, respectively,when a mixture of polyformaldehyde-DMSO was used.The TGA resuIts indicated the de-crease in thermostability of the esterified wood powder when it was pretreated by SO_2-DEA-DMSO,but not by paraformaldehyde-DMSO, The modified wood powder samples can bemolded by hot pressing to give smooth,glossy and semitransparent sheets.
出处
《应用化学》
CAS
CSCD
北大核心
1994年第5期75-78,共4页
Chinese Journal of Applied Chemistry
关键词
木粉
酯化改性
热塑性
热稳定性
wood powder,modification,esterification,thermoplasticity,thermostability
