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Title:	Mechanical and thermal properties of treated bamboo mesoparticle/nylon 6 composites
Authors:	Abeer Adel Salih (P78277)
Supervisor:	Rozli Zulkifli, Prof. Ir. Dr.
Keywords:	Universiti Kebangsaan Malaysia -- Dissertations Dissertations, Academic -- Malaysia Bamboo -- Mechanical properties Nylon -- Thermal properties Composite materials
Issue Date:	23-Dec-2019
Description:	Increasing attention has been given to the possibility of using bamboo as a reinforcement in polymeric matrices due to their desirable properties, including low cost, low density, renewability and excellent mechanical properties such as high toughness, high specific strength, and high specific modulus. The current study focuses on the use of chemically modified and unmodified bamboo mesoparticle as a reinforcement for nylon 6 composites. This research also focusses on the effect of mesoparticle size and loading on the mechanical and morphological properties of nylon 6 composites. Mesoparticle size may be able to increase particle surface area and hence influence the mechanical properties of materials. The mesoparticles used in this research ranges from 0.25 µm to 1.5 µm. The bamboo mesoparticle loadings investigated in this research are 9 %, 13 %, 18 % by weight (%wt). The mesoparticles are chemically modified through alkalization using sodium hydroxide in an effort to enhance surface compatibility. The samples were prepared by first mixing the bamboo mesoparticles and nylon 6 in a laboratory blender-mixer machine at 200 °C. Following this, an injection moulding machine was used to produce the test specimens. The thermal properties of feed bamboo fibre and nylon 6 were characterised using thermogravimetry analysis (TGA). The mechanical properties of the bamboo mesoparticle/nylon 6 composites were investigated by performing tensile, flexural, and impact testing while the tensile fracture morphology of nylon 6 composites was examined using scanning electron microscopy. TGA result shows that the pure bamboo is thermally stable at temperatures ranging from 20-200 °C. The tensile strength and Young's modulus of the bamboo mesoparticle fibre/nylon 6 composites increase with increasing bamboo mesoparticle loading and the highest tensile strength and modulus are 52.54 MPa and 3.101 GPa for mesoparticle size of 0.25 µm and 1.5 µm, respectively, at 13 %wt mesoparticle loading. Investigation of the flexural properties of bamboo mesoparticle/nylon 6 composites reveals that the composite with 1.5 µm mesoparticle size has the highest flexural strength of 42.8 MPa at 18 %wt mesoparticle loading, while the composite with 0.521 µm mesoparticle size has the lowest flexural strength of 25.5 MPa at 9 %wt mesoparticle loading. The composite with 0.25 µm mesoparticle size has the highest flexural modulus of 2.86 GPa. The incorporated mesoparticles caused a considerable decrease in the impact strength of bamboo mesoparticle/nylon 6 composites; the highest impact strength of 17.98 KJ/m2 is recorded for the composite with 1.5 µm mesoparticle size. Result of electron microscopic examination shows that there is no filler clumping aggregation and less void formation at 13 %wt mesoparticle loading, indicating that a relatively high amount of energy is required to break the nylon 6 composites. the Design-Expert software was used to optimize the properties of bamboo mesoparticle/nylon 6 composite. Result of the confirmatory experiments shows that the error between the predicted and the actual values does not exceed 5 %. Thus, the model can be effectively used to predict mechanical properties.,Ph.D.
Pages:	213
Call Number:	TP1180.P55S235 2019 3 tesis
Publisher:	UKM, Bangi
Appears in Collections:	Faculty of Engineering and Built Environment / Fakulti Kejuruteraan dan Alam Bina

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