Synthesis of thermosensitive poly(N-alkylacrylamide) gels and core–shell type gels
| Autor: | Takashi Iizawa, Yoshinobu Matsuura, Yukio Onohara |
|---|---|
| Rok vydání: | 2005 |
| Předmět: |
chemistry.chemical_classification
Reaction mechanism Polymers and Plastics Organic Chemistry Chemical modification Lower critical solution temperature Polyelectrolyte chemistry.chemical_compound chemistry Polymer chemistry Materials Chemistry medicine Triphenylphosphine Swelling medicine.symptom Alkyl Acrylic acid |
| Zdroj: | Polymer. 46:8098-8106 |
| ISSN: | 0032-3861 |
| Popis: | When the poly(acrylic acid) (PAA) gel-1,8-diazabicyclo-[5,4,0]-7-undecene salt (DAA) was placed in N -methyl-2-pyrrolidone containing an excess of alkylamine and triphenylphosphine, selective amidation took place from the outside to give the corresponding poly( N -alkylacrylamide) gel containing a C3 alkyl chain through a DAA–poly( N -alkylacrylamide) type gel capsule consisting of a hydrophilic unreacted core part and an amidated shell layer. The amidation proceeded by a reaction mechanism similar to the unreacted-core model. Thermal properties of the resulting poly( N -alkylacrylamide) gels such as deswelling behavior and equilibrium swelling ratio in water as a function of temperature were measured. The release of methyl orange from a poly( N -alkylacrylamide) gel and the gel capsule was also examined. PAA–poly( N -alkylacrylamide) type gel capsules containing a PAA core part and thermosensitive poly( N -alkylacrylamide) shell layer, prepared by the neutralization of DAA–poly( N -alkylacrylamide) type gel capsules, showed on–off chemical release characteristics in response to stepwise temperature changes across the LCST. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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