| Author | Kader, Mohammad Abdul |
| Call Number | AIT Thesis no. AE-97-1 |
| Subject(s) | Chitosan
|
| Note | A thesis submitted in partial fulfillment of the requirements for the degree of Master of
Engineering, School of Environment, Resources and Development
|
| Publisher | Asian Institute of Technology |
| Abstract | Chitosan membranes were prepared from different sources of chitosan (shrimp and
cuttle fish), different degree of deacetylation (66%, 70%,75% and 90%), commercial (Fluka
and Sigma grade) and laboratory prepared chitosan and different molecular weight (low,
medium and high) chitosan. The effects of molecular weight, degree of deacetylation, crystal
structure (a and p) on swelling index, tensile strength and elongation, breaking pressure and
tear resistance properties of the prepared membranes were studied. The results show that with
the increase of degree of deacetylation tensile strength and breaking pressure increased and
swelling index decreased. This is the indication of increasing in crystalline regions in
membranes prepared from higher degree of deacetylation. Higher molecular weight chitosan
membranes showed higher tensile strength and breaking pressure and lower swelling index.
a -chitosan (shrimp) membranes showed lower tensile strength and breaking pressure and
higher swelling index than P-chitosan. This indicated that antiparallel molecular and crystal
structure has less crystalline region than parallel molecular and crystal structure. Flux of distill
water was determined for the 66%,75% and 90% DD shrimp chitosan membranes at various
pressure ranging from 1.5 bar to 4 bar.For each membrane flux was found to have increased
with the increase in pressure. This effect is understandable on the basis of increased driving
pressure for fluid flow. For the same operating pressure flux of the chitosan membranes
increased with the decrease of the degree of deacetylation of the membranes. The effect of
degree of deacetylation on the flux of the chitosan membrane reassured that chitosan
molecules with higher DD chitosans were more flexible in solution than that of lower DD
ones. Because, higher chain flexible molecules tended to increase the crystalline regions in the
membranes and rendered the permeabilities of the membranes become smaller. |
| Year | 1997 |
| Type | Thesis |
| School | School of Environment, Resources, and Development (SERD) |
| Department | Department of Food, Agriculture and Natural Resources (Former title: Department of Food Agriculture, and BioResources (DFAB)) |
| Academic Program/FoS | Agricultural and Food Engineering (AE) |
| Chairperson(s) | Vincent, Jean Claude ;Stevens, Willem; |
| Examination Committee(s) | Jindal, Vinod Kumar ;Suwalee Chandrluachang ;Athapol Noomhorm; |
| Scholarship Donor(s) | SIDA (Swedish International Development Authority); |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 1997 |