Studies on in vitro release of CPM from semi-interpenetrating polymer network (IPN) composed of chitosan and glutamic acid

Kumari, Kamlesh; Kundu, Patit Paban

doi:10.1007/s12034-008-0028-y

Cited by 24 publications

(16 citation statements)

References 13 publications

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“…This is almost true for extrusion in long capillaries, but for short capillaries, the entry effect figures prominently and entrance effects are relatively numerous and complicated in short-tube flow of polymer melts [1,3,9,11,28,29]. For the case of a short capillary, Liang [11] obtained some semi-empirical quantitative relationships of the swell ratio with material characteristics and operational parameters [30].…”

Section: Introductionmentioning

confidence: 99%

Description of Extrudate Swell for Polymer Nanocomposites

Wang

2010

Materials

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Extrudate swell is often observed to be weakened in nanocomposites compared to the pure polymer matrix. A theory quantifying this would be significant either for optimum processing or for understanding their viscoelasticity. A unified extrudate swell correlation with material properties and capillary parameters was suggested for polymer melt and their nanocomposites when considering the reservoir entry effect. More importantly, it was the first to find that the composite swell ratio can be the matrix swell ratio multiplied by the concentration shift factor, which is similar to the dynamic moduli expression for composites. The factor is a function of the shear field (stress or shear rate), filler content, filler internal structure and the surface state as well as the matrix properties. Several sets of swell data for nanocomposites were chosen from publications to test the new theories. The proposed quantitative model displayed good fit for the five kinds of nanocomposites, which verified the rationality of the swell theory for nanocomposites.

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Section: Introductionmentioning

confidence: 99%

Description of Extrudate Swell for Polymer Nanocomposites

Wang

2010

Materials

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“…The IPN structure is an entangled network of two or more polymers, where at least one network has been crosslinked in the presence of the other . The IPNs provide synergistic effects by combining the individual properties of the polymers used, resulting in entirely new properties that can be not observed in either of the two individual networks alone.…”

Section: Resultsmentioning

confidence: 99%

Fabrication of photochromic hydrogels using an interpenetrating chitosan network

Lee

Yang

et al. 2017

J of Applied Polymer Sci

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The synthesis of a novel interpenetrating chitosan network post‐modified with spiropyran (SP) derivatives has been used to develop photochromic hydrogels. We have synthesized succinyl chitosan polymers containing a considerable number of both amines and carboxylic groups. Their intra/inter molecular amide coupling reactions and postmodification with SP derivatives resulted in the photochromic hydrogels functionalized with chitosan‐based interpenetrating polymer network structures. In this hydrogel system, SPs undergo reversible photoresponsive structural switching between a ring‐closed colorless SP form and a ring‐opened purple merocyanine form under specific light‐irradiation conditions. Notably, the photo‐mediated wettabilities and color intensities of the hydrogels increase by the increment in the molecular weight of SP‐functionalized chitosans. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017, 134, 45120.

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“…15 In the present study the kinetic data were analyzed with the help of the following equation, which could be helpful in determining the mechanism of the release process:…”

Section: Release Kineticsmentioning

confidence: 99%