Glass transition and thermal stability of poly(N-isopropylacrylamide) gels and some of their copolymers with acrylamide

Sousa, Ricardo Geraldo de; Magalhães, W.F.; Freitas, Roberto F. S.

doi:10.1016/s0141-3910(97)00209-7

Cited by 83 publications

(44 citation statements)

References 22 publications

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“…1. ) As could be observed, T g values of blends are in between the corresponding values of each polymers, as previously obtained for other similar materials such as poly(N-isopropylacrylamide-co-N,Ndimethylacrylamide) copolymers [44], poly(N-isopropylacrylamide)-co-acrylamide gels [45]…. Intermediate compositions (PNIPAAm contents of 20, 40, 60 and 80 wt.%) present a double T g region.…”

Section: Dsc Resultssupporting

confidence: 85%

Study of the chain microstructure effects on the resulting thermal properties of poly(l-lactide)/poly(N-isopropylacrylamide) biomedical materials

Lizundia

Meaurio

Laza

et al. 2015

Materials Science and Engineering: C

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Section: Dsc Resultssupporting

confidence: 85%

Study of the chain microstructure effects on the resulting thermal properties of poly(l-lactide)/poly(N-isopropylacrylamide) biomedical materials

Lizundia

Meaurio

Laza

et al. 2015

Materials Science and Engineering: C

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“…The glass transition at ca 130 °C is hardly observable on the DTA curve (Fig.2). These are in a good agreement with reference data [3][4]. The decomposition in the range 330-430 °C results in 94.9 % mass loss.…”

Section: Equilibrium Swelling Properties In Aqueous Solutionssupporting

confidence: 90%

“…In DSC measurements (at heating rate 20 °C min -1 ) they found that decomposition started at 388 °C and the corresponding peak displayed a maximum at 431 °C. Thermogravimetric studies on the same gel showed a 10 % loss of mass at about 100 °C due to the residual water and a more substantial mass loss (85 %) at 400 °C [4].…”

Section: Introductionmentioning

confidence: 91%

Host–guest interactions in poly(N-isopropylacrylamide) gel

Manek

Domján

Menyhárd

et al. 2015

J Therm Anal Calorim

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Responsive hydrogels are one of the most frequently proposed vehicles for targeted and controlled drug delivery. Interaction between the transported drug and the three-dimensional polymer network could compromise the kinetics and the efficiency of delivery in thermoresponsive polymers. Poly(N-isopropylacrylamide) (PNIPA) gel was equilibrated with excess 500 mM aqueous solutions of three model drug molecules, phenol, ibuprofen and dopamine. These molecules affect the swelling properties of PNIPA in different ways. After determining the drug uptake and drying to constant mass the loaded samples were studied with simultaneous thermal analysis (STA). The difference in thermal response is interpreted in terms of the different typical molecular interactions in these systems under confined conditions. For phenol and dopamine the water -phenol and dopamine -dopamine interactions, respectively, are stronger than that between the guest and polymer. For ibuprofen -PNIPA the synergy in the thermal decomposition may stem from a strong polymeribuprofen relation.

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“…The developed model [35] predicts a close-loop miscibility gap with an upper critical solution temperature (UCST) at 779.1 K. However, the UCST could not be verified by experimental observations, because at this temperature the polymer will hardly be stable. The DSC-experiments, performed by Sousa et al [29], show a degradation behavior starting at approximately 703 K.…”

Section: Introductionmentioning

confidence: 96%