Synthesis and characterization of core-shell microspheres with double thermosensitivity
We have synthesized doubly thermosensitive core-shell microspheres composed of chemically cross-linked poly(N-n-propyl acrylamide-co-styrene) (P(nPA-co-S)) with different styrene contents as the core and linear poly(N,N-diethyl acrylamide) (PDEA), poly(N-isopropyl acrylamide) (PiPA), or poly(N-isopr...
| Veröffentlicht in: | Langmuir : the ACS journal of surfaces and colloids. - 1992. - 23(2007), 3 vom: 30. Jan., Seite 1047-51 |
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| 1. Verfasser: | |
| Weitere Verfasser: | , |
| Format: | Aufsatz |
| Sprache: | English |
| Veröffentlicht: |
2007
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| Zugriff auf das übergeordnete Werk: | Langmuir : the ACS journal of surfaces and colloids |
| Schlagworte: | Journal Article Research Support, Non-U.S. Gov't Acrylic Resins Polymers Polystyrenes Water 059QF0KO0R polyacrylamide 9003-05-8 |
| Zusammenfassung: | We have synthesized doubly thermosensitive core-shell microspheres composed of chemically cross-linked poly(N-n-propyl acrylamide-co-styrene) (P(nPA-co-S)) with different styrene contents as the core and linear poly(N,N-diethyl acrylamide) (PDEA), poly(N-isopropyl acrylamide) (PiPA), or poly(N-isopropyl methacrylamide) (PiPMA) as the shells. The morphologies and swelling properties of the core and the core-shell microspheres have been studied. The P(nPA-co-S) copolymers have a similar volume phase transition temperature regardless of the styrene content, indicating a two-layer structure in the microspheres with a PS-rich inner core and a PnPA-rich outer layer resulting from soap-free emulsion polymerization in water. Upon the addition of the second shell composed of linear thermosensitive polymers, the core-shell microspheres display a two-step shrinking behavior when heated. The P(nPA-co-S) core exhibits a volume phase transition temperature at 13-15 degrees C, while the shells of PDEA, PiPA, and PiPMA have volume phase transition temperatures at 28, 32, and 42 degrees C, respectively. The core-shell microspheres are composed of three layers and possess two volume phase transition temperatures |
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| Beschreibung: | Date Completed 28.02.2007 Date Revised 21.11.2013 published: Print Citation Status MEDLINE |
| ISSN: | 1520-5827 |