Preparation, Characterization And Slow-Release Properties Of Biocomposites Comprising Chitosan Encapsulated In Natural Rubber Matrices

Simple item page
dc.contributor.authorAbu, Norhidayah
dc.date.accessioned2017-02-02T07:57:44Z
dc.date.available2017-02-02T07:57:44Z
dc.date.issued2016-07
dc.description.abstractThis research project consists of two parts. In the first part, we determined the stability of acidified chitosan (CTSAc) gel incorporated with known amounts of either 1-Naphthol (product designated as CTSAc/1-N) or 2-Naphthol (product designated as CTSAc/2-N) in water with different pH values. In acidified water (pH ≤ 4), CTSAc/1-N or CTSAc/2-N swelled tremendously and broke apart easily. In neutral water (pH ≈ 7), CTSAc/1-N and CTSAc/2-N swelled but remained intact even after two weeks. In alkalized water (pH ≥ 9), CTSAc/1-N and CTSAc/2-N hardly swelled even after being soaked for three months. In addition, biocomposites comprised of solely CTSAc encapsulated in uncrosslinked natural rubber ({CTSAc}NRucl) and crosslinked natural rubber ({CTSAc}NRcl) were prepared. From the water uptake study, the percentage amount of water in NRcl, NRucl, {CTSAc}NRcl and {CTSAc}NRucl after 48 h was found to be 1.8%, 3.0%, 75% and 131%, respectively. In the second part, biocomposites comprised of CTSAc/1-N or CTSAc/2-N encapsulated in NRucl ({CTSAc/1-N}NRucl or {CTSAc/2-N}NRucl) and in NRcl ({CTSAc/1-N}NRcl or {CTSAc/2-N}NRcl) were prepared. All polymeric materials were characterized by means of FT-IR spectroscopy, TGA and VPSEM. The percentage of the naphthols released in constant (non-refreshed) and changing (refreshed) amounts of distilled water (pH ≈ 7) was studied. It is found that the percentage of 1- and 2-Naphthol released up to a total of 30 days in non-refreshed water from {CTSAc/1-N}NRcl, {CTSAc/1-N}NRucl, {CTSAc/2-N}NRcl and {CTSAc/2-N}NRucl is 39.3%, 44.1%, 44.8% and 56.1%, respectively. In the case whereby the water was refreshed for every 24 h, the percentage of 1- and 2-Naphthol released up to a total of 30 days from {CTSAc/1-N}NRcl, {CTSAc/1-N}NRucl, {CTSAc/2-N}NRcl and {CTSAc/2-N}NRucl was found to be 53.4%, 60.9%, 57.3% and 62.0%, respectively. In the case whereby the water was refreshed for every 72 h, the percentage of 1- and 2-Naphthol released up to a total of 30 days from {CTSAc/1-N}NRcl, {CTSAc/1-N}NRucl, {CTSAc/2-N}NRcl and {CTSAc/2-N}NRucl was found to be 57.5%, 63.5%, 62.7% and 66.1%, respectively. It was also found that the release of 1- or 2-Naphthol in refreshed and non-refreshed water had not reached equilibrium in 30 days. Based on these findings, it can be concluded that the release of either 1- or 2-Naphthol from the biocomposites was a slow-release indeed.en_US
dc.identifier.urihttp://hdl.handle.net/123456789/3654
dc.subjectPreparation, characterization and slow-release properties of biocomposites comprising chitosan encapsulateden_US
dc.subjectin natural rubber matrices.en_US
dc.titlePreparation, Characterization And Slow-Release Properties Of Biocomposites Comprising Chitosan Encapsulated In Natural Rubber Matricesen_US
dc.typeThesisen_US
Files
License bundle
Now showing 1 - 1 of 1
Thumbnail Image
Name:
license.txt
Size:
1.71 KB
Format:
Item-specific license agreed upon to submission
Description:
Download
Collections
Pusat Pengajian Sains Kimia - Tesis