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Sustainable Polymer Production: Investigating Synthesis and Copolymerization of Cyclic Ketene Acetals
KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Chemical Engineering.
KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Chemical Engineering.
KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Chemical Engineering.
KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Chemical Engineering.
2023 (English)Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesisAlternative title
Hållbar polymerproduktion: Undersökning och syntes samt sampolymerisation av cykliska ketenacetaler (Swedish)
Abstract [en]

The large amount of non-degradable plastic waste has become a significant environmental concern, leading to an increased need for degradable plastics. Here in, to create degradable polymers, polyesters were produced through radical ring opening polymerization using cyclic ketene acetals. The cyclic ketene acetal monomer 5,6-benzo-2-methylene-1,3-dioxepane has been prepared for the synthesis of homo- and copolymers with methyl methacrylate, α-methylene-γ-valerolactone, α-methylene-γ-butyrolactone, cholesterol methacrylate and limonene acrylate. The polymerization was conducted using radical ring opening polymerization both in bulk and solution polymerization. The structural characteristics of the polymer were determined by different characterization methodologies, including TGA, DSC, SEC, FTIR and 1D 1H-NMR. The results obtained from 1H-NMR analysis showed the composition of the copolymers. TGA analysis revealed the thermal stability of the polymers and their degradation patterns. DSC analysis provided information about the glass transition temperatures (Tg’s) of the polymers. Moreover, the Tg indicated the presence and amounts of comonomers in the copolymers. Overall, the results showed the influence of different comonomers on the properties of the polymers by successfully incorporating the comonomers in the polymer. The thermal properties for polymers containing methyl methacrylate became more thermally stable. The Tg, analyzed with DSC, shifted from the Tg of homopolymers indicating the incorporation of both monomers. The polymers were successfully degraded via hydrolysis in alkaline conditions breaking them down into smaller pieces making them easier to recycle. To conclude, the results all indicate that the incorporation of BMDO and thereby possibly other CKA-monomers into the polymer chains of commonly used plastics could provide valuable tools in the recycling of said plastics.

Place, publisher, year, edition, pages
2023.
Series
TRITA-CBH-GRU ; 2023:213
Keywords [en]
Monomers, polymers, radical, radical ring opening polymerization, polymerization, BMDO, MMA, MVL, MBL, comonomer, copolymer, rROP, sustainable, biobased, degradable, monomer synthesis, plastic, polyester, bulk, solution, NMR, FTIR, TGA, DSC, SEC, hydrolysis, molecular weight, diol, ester bonds
National Category
Polymer Chemistry
Identifiers
URN: urn:nbn:se:kth:diva-330305OAI: oai:DiVA.org:kth-330305DiVA, id: diva2:1777262
Subject / course
Chemical Engineering
Educational program
Master of Science in Engineering - Engineering Chemistry
Examiners
Available from: 2023-12-29 Created: 2023-06-29

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CiteExportLink to record
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