PREPARATION OF ENVIRONMENTAL FRIENDLY CELLULOSE-BASED HONEYCOMB CORE
Honeycomb cores have been used for sandwich panel construction in aerospace industry to produce structures with high specific stiffness. Honeycomb is a cellular material that consists of open cells. The most commonly used honeycomb is Nomex paper honeycomb, which is made from aramid material impregn...
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| Format: | Theses |
| Language: | Indonesia |
| Online Access: | https://digilib.itb.ac.id/gdl/view/46402 |
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| Institution: | Institut Teknologi Bandung |
| Language: | Indonesia |
| Summary: | Honeycomb cores have been used for sandwich panel construction in aerospace industry to produce structures with high specific stiffness. Honeycomb is a cellular material that consists of open cells. The most commonly used honeycomb is Nomex paper honeycomb, which is made from aramid material impregnated with phenolic resins. However, aramid material is a synthetic polymer that is not sustainable and renewable. An alternative material that has been considered to replace aramid is cellulose. In this study, microcrystalline cellulose (MCC) and nanocrystalline cellulose (NCC) were extracted from Cladophora algae. MCC was produced by hydrolysis treatment using 1M of sulphuric acid. NCC was extracted by hydrolysis treatment using sulphuric acid with a concentration of 2, 3, 4 and 5M and hydrolysis time of 5, 10 and 15 hours. The morphology of MCC and NCC was characterized by using SEM and TEM, respectively. The degree of crystallinity of NCC was measured by using FTIR and XRD, while the particle size of NCC was measured by using PSA. The extracted MCC and NCC were then made into paper by using solution casting with the grammage variation of 80, 100, 200 and 300 g/m2 for MCC, and 80 and 100 g/m2 for NCC. MCC and NCC paper were impregnated with epoxy resin by varying the addition of aceton into epoxy resin. MCC and NCC paper were made into honeycomb core by using expansion methods. MCC has a typical web-like structure, while NCC exhibit a needle-like particle with a diameter in the range of 17 – 28 nm and length in the range of 189 – 380 nm. The degree of crystallinity of MCC and NCC-obtained was 76% and 96%, respectively. The mechanical properties of MCC paper was higher than NCC paper. The highest tensile strength and modulus of paper was obtained in MCC 80 g/m2 impregnated with epoxy resin-50% of aceton, which is 126,93 MPa and 13,41 GPa, respectively. The highest compression strength of honeycomb core was obtained by using MCC raw material which is 0,72 MPa.
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