将淀粉基水性异氰酸酯木材胶黏剂用于结构胶合木的胶接并进行加速老化处理，通过Raman、13C-NMR及GPC分析老化过程中发生的化学及物理变化，以揭示该胶黏剂老化机理。结果表明:在胶膜加速老化过程中异氰酸酯基发生了化学反应，有胺生成随后又分解，而与聚异氰酸酯(PMDI)交联的复合变性淀粉的结构未见改变。加速老化后的胶黏剂中聚乙烯醇(PVA)的高分子链被切断，形成低分子溶于水中，而其他成分没有溶出与降解。
Abstract
Starchbased aqueous polymer isocyanate adhesive was used to bond the structural laminated lumber. Then it was retrogressed accelerative by boiling treatment. The chemical and physical changes in the aging process were analyzed by means of Raman, 13C-NMR and GPC to reveal the retrogress mechanism. The results showed that the reaction of -NCO group occurred in the bonding film in the process of retrogress, i.e., the amine compounded firstly and then decompounded. But there was no change in the modified starch linked to the polymer isocyanate (PMDI). After the accelerated retrogression, the chains of polyvinyl alcohol (PVA) in the adhesive were cut into small molecules dissolving in water. Other components did not dissolve or degrade.
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参考文献
[1]时君友. 淀粉基API木材胶黏剂及其固化与老化机理研究[D]. 哈尔滨:东北林业大学,2007.
[2]时君友,韦双颖. 水性改性淀粉—多异氰酸酯胶黏剂的研究[J]. 林业科学,2003,39(5):105-110.
[3]时君友,顾继友,涂怀刚,等. 复合变性淀粉制备淀粉基异氰酸酯胶黏剂的研究[J]. 林产化学与工业,2008,28(5):77-83.
[4]张新申. 高效液相色谱分析[M]. 北京:科学出版社,1985.
[5]Deneve B, Delamr M, Nguyen T T, et al. Failure mode and ageing of steelepoxy joints[J]. Applied Surface Science 1998, 134: 202-212.
[6]ZanniDeffarges M P, Shanahan M E R. Diffusion of water into an epoxy adhesivecomparison between bulk behavior and adhesive joints[J]. Int J of Adhesion and Adhesives, 1995, 15: 137-142.
[7]Ivanova K I, Pethrick R A, Affrossman S. Investigation of mechanical thermal analysis and dielectric spectroscopy[J]. Polymer, 2000, 41: 6 787-6 796.
[8]Liu J, Gustafsson K, Lai Z, et al. Surface characteristics, reliability, and failure mechanisms of tin/lead, copper, and gold metallizations[J]. IEEE Transactions on Components, Packaging, and Manufacturing Technology, 1997, 20: 21-30.
基金
收稿日期：2009-04-14修回日期：2009-10-19基金项目：科技部农业转化资金项目(2007GB2B10078)；吉林省科技发展计划重点项目(20060401-2)；国家重点基础研究计划(2004CB719706)作者简介：时君友(1964—)，教授，博士。Email: jlshijunyou@yahoo.com.cn。引文格式：时君友,王垚. 淀粉基水性异氰酸酯木材胶黏剂老化机理研究[J]. 南京林业大学学报:自然科学版,2010,34(2):81-84.
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