Open Access

ARTICLE

Control on Gradient Adhesive Loading of Porous Laminate: Effects on Multiple Performance of Composites with Bamboo Bundle and Sliver

Jianchao Deng^1,2, Haiying Zhou², Fuming Chen², Shuangbao Zhang^1,*, Ge Wang^2,*

1 Beijing Key Laboratory of Wood Science & Engineering, College of Material Science & Technology, Beijing Forestry University, Beijing, 100083, China
2 Key Laboratory of National Forestry and Grassland Administration/Beijing for Bamboo & Rattan Science and Technology, International Center for Bamboo and Rattan, Beijing, 100102, China

* Corresponding Authors: Shuangbao Zhang. Email: ; Ge Wang. Email: ;

(This article belongs to the Special Issue: Renewable building materials and properties)

Journal of Renewable Materials 2021, 9(9), 1555-1570. https://doi.org/10.32604/jrm.2021.015461

Received 20 December 2020; Accepted 18 January 2021; Issue published 23 April 2021

Abstract

Elementary units “bamboo bundle” and “bamboo sliver” were processed and cross-linked as “bamboo-bundle veneer (BBV)” and “bamboo-sliver veneer (BSV)” for preparation of laminated composites. The concept of “high-content-adhesive surface treatment” was raised to improve boards’ performance, rather than increasing adhesive absorption of every layer’s porous unit. That is, some BBVs experienced an extra “dipping & drying” to absorb more resin (named “HBBV”). The effect of the amount of knitting threads was also discussed for influencing BBV’s quality. Results indicated that light transmittance of BBVs decreased as the amount of threads added from 3 to 8, while mechanical stiffness increased. Adding two skin layers of HBBVs symmetrically was helpful to enhance 24-hour underwater and 28-hour “boil-dry-boil” dimensional stability for boards with BSVs as core, while more than two pairs of HBBVs were needed to improve 28-hour “boil-dry-boil” dimensional stability of boards with BBVs as core. Two symmetrical surface layers of BBVs/HBBVs provided BSV-boards/BBV-boards with greater bending resistance, while such “surface treatment” would not raise shearing strength of BSV-boards upon 28-hour “boil-dry-boil” treatment. Besides, the data obtained from drop-hammer impact test indicated that more than two pair of surface BBVs or HBBVs were required for significant improvement in anti-impact property.

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