Study on the Use of Supercritical Carbon Dioxide as a Solvent to Prepare Novel, Efficient Controlled-Release Materials. (English)
In: Kobunshi Ronbunshu, Jg. 71 (2014), Heft 1, S. 1-10
academicJournal
Zugriff:
In order to develop a novel controlled-release materials, we previously attempted to impregnate poly(L-lactide) (poly(L-LA)), poly(L-LA-ran-CL (CL: ε-caprolactone) and poly(L-LA-ran-TEMC) (TEMC: tetramethylene carbonate) with low boiling point organic compounds using supercritical carbon dioxide (scCO 2 ) as the solvent. In this work, the factors influencing the impregnation of poly(L-lactic acid) copolymers with various compounds in scCO 2 was investigated. The effects of temperature, pressure and time on the impregnation process were evaluated, using synthetic poly(L-LA-ran-CL), poly(L-LA-ran-TEMC) or poly(L-LA-ran-DXO) (DXO: 1,5-dioxepan-2-one) as the base polymers. Preparation of the controlled-release materials was carried out using essential oil from Thujopsis dolabrata vat. hondae in scCO 2 at 14 MPa, 40°C for 3 h. The oil content was highest for poly(L-LAran-CL) and lowest for poly(L-LA-ran-DXO). The mechanical properties of those impregnated were evaluated by a tensile testing machine. Although the tensile strength and elastic modulus of poly(L-LA-ran-TEMC) and poly(L-LA-ran-DXO) increased greatly by impregnation in scCO 2 , the elongation decreased conversely. Poly(L-LA-ran-DXO) could easily be hydrolyzed in saturated calcium chloride solution, and the containing oil was also released earlier than for other polymers. [ABSTRACT FROM AUTHOR]
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Titel: |
Study on the Use of Supercritical Carbon Dioxide as a Solvent to Prepare Novel, Efficient Controlled-Release Materials. (English)
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Autor/in / Beteiligte Person: | Chikara, TSUTSUMI ; Ami, TSUZUKI ; Teruyuki, HARA ; Yuushou, NAKAYAMA ; Takeshi, SHIONO |
Zeitschrift: | Kobunshi Ronbunshu, Jg. 71 (2014), Heft 1, S. 1-10 |
Veröffentlichung: | 2014 |
Medientyp: | academicJournal |
ISSN: | 0386-2186 (print) |
DOI: | 10.1295/koron.71.1 |
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