search query: @supervisor Seppälä, Jukka / total: 257
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| Author: | Nguyen, Phan |
| Title: | Synthesis and characterization of novel polyamides |
| Publication type: | Master's thesis |
| Publication year: | 2016 |
| Pages: | (5) + 61 Language: eng |
| Department/School: | Kemian tekniikan korkeakoulu |
| Main subject: | Renewable Materials Engineering (KM3002) |
| Supervisor: | Seppälä, Jukka |
| Instructor: | Spoljaric, Steve ; Koskinen, Perttu ; Nyman, Tomi |
| Electronic version URL: | http://urn.fi/URN:NBN:fi:aalto-201610124932 |
| Location: | P1 Ark Aalto 4635 | Archive |
| Keywords: | polyamides polycondensation thiol-ene addition reactions long aliphatic segment polyamides |
| Abstract (eng): | There has been a growing interest in producing polymers from bio-based resources as alternatives for fossil resources. One of the most common engineering plastics, polyamides, can be produced from monomers of fossil or renewable origin, such as renewable oils and fats The major drawbacks of polyamides include low molecular weight and poor water stability. The aim of this thesis was to synthesize and characterize long aliphatic segment polyamides by using long chain aliphatic dicarboxylic acids as monomers. A further objective was to synthesize and characterize novel sulphur-containing polyamides. The monomer of sulfur-containing polyamide was prepared from 10-undecenoic acid via thiol-ene addition reaction. All polyamides were synthesised via polycondenzation. All long aliphatic polyamides were synthesized successfully with high molecular weight ranges from 37 000-54 000 g/mol. Crucial factors necessary for obtaining high-molecular weight polyamides were identified. The water stabilities of novel polyamides were superior to commercial counterparts, while the presence of sulphur within the polyamide chain enhanced chemical resistance measured as reduced solubility in a range of solvents. All prepared polyamides were fully characterized (NMR, DSC, DMA, Tensile Test, and TGA) and the results of these investigations will be discussed within this thesis. The thermal analyses of these polyamides revealed melting points in the range from 128 to 207 °C which are rather low compared to the commercial polyamides, Nylon 6 or Nylon 6/6, while the thermal degradation temperature was enhanced. |
| ED: | 2016-10-16 |
INSSI record number: 54664
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