林业工程学报2016，Vol.1Issue(6)：45-50,6.DOI:10.13360/j.issn.2096-1359.2016.06.008
薄膜层数对热塑性树脂胶合板性能的影响
Effects of number of film layers on properties of thermoplastic bonded plywood
摘要
Abstract
In order to alleviated the formaldehyde emission problem in the production and use of wood⁃based panels, high density polyethylene ( HDPE) films were selected as wood adhesives to bond untreated poplar veneers and silane⁃treated veneers respectively using hot flat⁃pressing followed by cold flat⁃pressing. Physical⁃mechanical properties and thermal stability of the thermoplastic bonded plywood using different HDPE film layers (1,2,3 and 4 layers between ev⁃ery two veneers) were investigated by the mechanical testing machine and dynamic mechanical analysis ( DMA) . Results showed that the number of HDPE film layers had a similar impact on both the untreated and silane⁃treated panels. It had a slight effect on shear strength while played an important role in water absorption and bending strength of the plywood. When the HDPE film increased from 1 layer to 4 layers, the water resistance and bending strength of the plywood greatly enhanced. Because of the melting behavior of thermoplastic polymer, the thermal stability of the HDPE film bonded ply⁃wood was weakened with the increasing film dosage. The performance of silane⁃treated panels was much better than the untreated samples at the same number of the HDPE film layers. Only when 2⁃layer HDPE films were used between every two untreated veneers, the shear strength of the untreated plywood was higher than 0.7 MPa and just met the requirement for type I grade plywood in accordance with GB/T 9846�3-2004. The shear strength, wood failure and 24 h water ab⁃sorption values were 1�89 MPa, 95% and 62�24%, respectively, when only 1⁃layer HDPE film was used between every two silane⁃treated poplar veneers. In addition, the silane treatment led to considerable improvement in thermal stability as proved by higher storage modulus and lagged temperature for tand peak value. Nearly 80% increase in storage modulus at 130 ℃ was acheived and the temperature reaching tan δ peak value increased from 141 ℃ to 180 ℃ when 1⁃layer HDPE film was used between every two silane⁃treated veneers.关键词
HDPE薄膜/热塑性树脂胶合板/硅烷改性/耐高温性能Key words
HDPE film/thermoplastic bonded plywood/silane treatment/thermal stability分类
轻工纺织引用本文复制引用
方露,殷月红,韩于露,常亮,吴智慧..薄膜层数对热塑性树脂胶合板性能的影响[J].林业工程学报,2016,1(6):45-50,6.基金项目
江苏省自然科学基金项目（BK20150881）；中国林科院林业新技术所基本科研业务费专项（CAFINT2014C02）；南京林业大学青年科技创新基金（ CX2015020）；江苏省高等学校大学生创新创业训练计划项目（ SPITP201610298127H）。 （）
