Degradable polyester based on long alkane diesters and diols : their properties and biodegradability = 긴 알칸 디에스테르와 디올로부터 얻어진 분해성 폴리에스테르 : 그들의 성질과 생분해성their properties and biodegradability

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Long alkane diesters and diols were prepared and condensed to synthesize poly(triacontamethylene triacontanedioate)(PTRM), poly(dodecamethylene triacontanedioate) (PDDT), poly(butylene triacontanedioate) (PBUT), poly (tetratriacontamethylene tetratriacontanedioate) (PTTM), poly(tetracosamethylene tetracosanedioate) (PTEM). All the polymers were soluble only in toluene and decalin at elevated temperature. All the polyesters showed not only high melt-transition of the range from 95℃ up to 113℃ but also high thermal stability, which are comparable to thermal properties of low density polyethylene (LDPE). Their enthalpy of melting were 88.1-203.8 kJ/mol larger than that of LDPE. Films were prepared from PTRM and PDDT by melting-casting and subjected to testing. Higher molecular weight PTRM could be obtained by solid state polymerization and melt post-polymerization by the addition of MgO. Their elongation values were low (5%) and tensile strengths were around 12.5 MPa above the compared LDPE value. The small contact angles indicate that these polyesters exhibit good wettability in comparison with polyethylene. The evidences of biodegradation of these polyester films were obtained with Rhizopus arrhizus lipase, in activated sludges, and in soil. From the increases of total organic carbon concentration, carboxy end group, and turbidity, the decreases of molecular weight, weight losses, and the breakdowns of surface morphology, we confirmed that these polyesters are biodegraded. The narrowing of molecular weight distribution after degradation suggests that these polyesters are exogenously (degrading from terminal groups to inward in the chain) degraded. The three differently treated PTRM films were prepared: the quenched sample (PTRM-Q); the sample formed under room temperature (PTRM-R); the annealed sample (PTRM-A). The degree of crystallinity and crystallite size were in order: $PTRM-A > PTRM-R > PTRM-Q$. The biodegradability was in order: $PTRM-Q > PTRM-R > PTRM-A$.
Advisors
Cho, I-Whan조의환
Description
한국과학기술원 : 신소재공학과,
Publisher
한국과학기술원
Issue Date
1997
Identifier
113181/325007 / 000929052
Language
eng
Description

학위논문(박사) - 한국과학기술원 : 신소재공학과, 1997.2, [ xiv, 143 p. ]

Keywords

Properties; Polyethylene; Degradable polyester; Biodegradability; 생분해성; 성질; 폴리에틸렌; 분해성 폴리에스테르

URI
http://hdl.handle.net/10203/49755
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=113181&flag=dissertation
Appears in Collection
MS-Theses_Ph.D.(박사논문)
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