室温固化型淀粉基木材胶黏剂的热分解动力学  

Thermal Decomposition Kinetics of Room Temperature Cured Starch-based Wood Adhesive

作　　者：乔治邦 顾继友[1] 曹军[2] 谭海彦[1] 张彦华[1,2] 

机构地区：[1]东北林业大学材料科学与工程学院,黑龙江哈尔滨150040 [2]东北林业大学机电工程学院机械工程博士后流动站,黑龙江哈尔滨150040

出　　处：《林产化学与工业》2016年第1期85-91,共7页Chemistry and Industry of Forest Products

基　　金：国家林业公益性行业科研专项(20150452);国家自然科学基金资助项目(31200442);博士后科学基金资助项目(LBHZ13003)

摘　　要：基于热分析动力学理论,采用热重(TG)法研究了室温固化型淀粉基木材胶黏剂在不同升温速率下的热分解行为,为室温固化型淀粉基胶黏剂在使用中的老化问题提供一定的参考。在X射线衍射分析的基础上,采用无模型Kissinger方程和F-W-O方程对原淀粉(NS)、酯化淀粉(ES)、原淀粉胶黏剂(NSA)、酯化淀粉胶黏剂(ESA)及多异氰酸酯预聚体/酯化淀粉胶黏剂(PESA)的热分解行为进行分析,求解其活化能,探究酯化和预聚体加入对淀粉及胶黏剂热分解行为的影响。结果表明,酯化没有改变淀粉的晶体结构类型,但降低了其结晶度,使得淀粉的热分解活化能减小,热稳定性下降;加入多异氰酸酯预聚体后,酯化淀粉胶黏剂的热分解活化能增大,热稳定性提高。与F-W-O法相比,无模型Kissinger法更易实现对热解活化能的求解,结果更为可靠。通过Kissinger法求得NS、ES、NSA、ESA及PESA的热分解活化能分别为175.75、174.79、174.35、172.00和174.82 k J/mol。Based on the theory of thermal analysis kinetics,the thermal decomposition behavior of room temperature cured starchbased wood adhesive was studied by thermogravimetric（ TG） analyzer at different heating rates. This might supply some information that could use for solving agent problem occuring in application of room temperature cured starch adhesive. On the basis of X-ray diffraction analysis,the effect of esterification and prepolymer addition on the thermal decomposition behavior of starch and starch adhesive were characterized separately. The model-free Kissinger equation and F-W-O equation was carried out to investigate the thermal decomposition kinetics of native starch（ NS）,esterified starch（ ES）,native starch adhesive（ NSA）,esterified starch adhesive（ ESA） and polyisocyanate prepolymer / esterified starch adhesive（ PESA）,respectively. The results showed that the crystallinity degree of starch did not change after esterification,but the crystallinity decreased. This resulted in the poorer thermal stability and lower thermal decomposition activation energy of starch. When polyisocyanate prepolymer was added,the decomposition activation energy increased. This illustrated that the enhancement of prepolymer added was greater than the weaken effect of esterification. Compared with F-W-O equation,the model-free Kissinger equation was easier to achieve the thermal decomposition activation energy value. The thermal decomposition activation energy values of NS,ES,NSA,ESA andPESA were 175. 75,174. 79,174. 35,172. 00 and 174. 82 k J / mol,respectively.

关 键 词：室温固化 淀粉 木材胶黏剂 热分解 动力学 

分 类 号：TQ35[化学工程]