Preparation and Performances of Bamboo-Plastic Composites Based on Surface and Interfacial Modulations of Bamboo Powders
To improve the interfacial compatibility between bamboo powder and nonpolar polymers,bamboo powders were synergistically modified with NaOH solution and methyltrimethoxysilane(MTMS),then bamboo-plastic composites(BPC)were prepared with linear low density polyethylene(LLDPE)by the uniformly mixing and hot pressing.The chemical structures and wettability of bamboo powders before and after modification,the mechanical properties,section topography,water absorption,and dimensional stability of the prepared BPC were analyzed and characterized.The results show that bamboo powders treated with NaOH solution have enhanced hydrophilicity and crystallinity.After further modification with MTMS,the Si—CH3 groups with low surface energy were introduced to the surface,and the bamboo powders were transformed from hydrophilic to hydrophobic.Compared with the BPC prepared by unmodified bamboo powders,the tensile strength and modulus of rupture of BPC prepared by bamboo powders that were modified by NaOH and MTMS are respectively increased by 29.5%and 28.6%,its water absorption is decreased from 16%to 8%,and its thickness expansion rate of water absorbing after24 h is decreased from3.4%to1.3%.
Bamboo-Plastic CompositeInterfacial CompatibilityLinear Low Density PolyethyleneMethyltrimethoxysilaneHydrophobic ModificationMechanical Property
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