Dynamic Mechanical Properties of Trimethylborate(TMB) Modified Poplar Wood by Sol-gel Process

摘要

To develop novel wood preservation technique trimethylborate(TMB) and boric dioxide were used by sol-gel process to modify poplar (Populus euramevicana cv.'I-214'.) wood. The temperature variations of the storage modulus and the loss tangent along the grain for two kinds of chemically modified poplar woods were measured at 2Hz over a temperature range of -50 to 200°C.The storage modulus of modified woods were observed slight increases over the temperature range tested by introduction of bulky side chains and the tanδ remarkably reduced due to boric acid bridges between the hydroxyl groups which restricted the micro-Brownian motion of the main chains. In TMB treatment, peak width at half height of tanδ broadened significantly, indicating remarked cross-linking effect in polycondensation with wood cellulose.