Differential scanning calorimetry of crystallized PVA hydrogels

Peppas, Nikolaos A.; Merrill, Edward W.

doi:10.1002/app.1976.070200604

Cited by 270 publications

(159 citation statements)

References 3 publications

Supporting

Mentioning

150

Contrasting

Unclassified

Order By: Relevance

“…Before DSC analysis, the samples were dried in vacuum for at least 48 h at 60°C. The crystallinity degree was calculated using Equation (1) and the heat of fusion of a perfect crystal of PVA sample (!H f* = 138.6 J/g) [43]:…”

Section: Differential Scanning Calorimetry Analysismentioning

confidence: 99%

Effects of polymerization degree on recovery behavior of PVA/PVP hydrogels as potential articular cartilage prosthesis after fatigue test

Yan¹,

Xiong²,

Peng³

et al. 2016

Express Polym. Lett.

View full text Add to dashboard Cite

Abstract. Poly (vinyl alcohol)/poly (vinyl pyrrolidone) (PVA/PVP) hydrogels with various polymerization degrees of PVA were synthesized by a repeated freezing-thawing method. The influence of polymerization degree on microstructure, water content, friction coefficient, compressive fatigue and recovery properties of PVA/PVP hydrogels were investigated. The results showed that higher polymerization degree resulted in larger compressive modulus and lower friction coefficient. The fatigue behaviors of PVA/PVP hydrogels were evaluated under sinusoidal compressive loading from 200 to 800 N at 5 Hz for up to 50 000 cycles. The unconfined uniaxial compressive tests of PVA/PVP hydrogels were performed before and after fatigue test. During the fatigue test, the height of the hydrogel rapidly decreased at first and gradually became stable with loading cycles. The compressive tangent modulus measured 0 h after fatigue was significantly larger than the values obtained before test, and then the modulus recovered to its original level for 48 h after test. However, the geometry of hydrogels could not return to the original level due to the creep effects. PVA/PVP hydrogels prepared with lower polymerization degree showed better recovery capability than that prepared with high polymerization degree.

show abstract

Section: Differential Scanning Calorimetry Analysismentioning

confidence: 99%

Effects of polymerization degree on recovery behavior of PVA/PVP hydrogels as potential articular cartilage prosthesis after fatigue test

Yan¹,

Xiong²,

Peng³

et al. 2016

Express Polym. Lett.

View full text Add to dashboard Cite

show abstract

“…DSC curves were obtained using a DSC Where ΔH c represents the crystallization enthalpy and ΔH 100 is the heat of crystallization for a 100% crystalline PVA, ΔH 100 =138.6 J/g (from literature) [21,22].…”

Section: Differential Scanning Calorimetry (Dsc)mentioning

confidence: 99%

Influence of Glyoxal in the Physical Characterization of PVA Nanofibers

Blanes

Gisbert

Marco

et al. 2010

Textile Research Journal

View full text Add to dashboard Cite

The influence of solution composition is directly related with Poly (vinyl alcohol) PVA nanofibres properties. Electrospinning is a viable technique to develop PVA nanofibres. The presence of a crosslinking agent as glyoxal can produce variations not only in anti-water solubility effect but in the morphology of the electrodeposited fibres. The objective of this study was to characterize glyoxal influence on PVA nanofibres. Thus we studied fibre dimensions, weight of deposited fibres, fibre crystallinity. The relation between those properties and nanofibres web´ ones (colour, opacity and roughness) were studied. In this study we changed glyoxal concentration.SEM, DSC and AFM showed changes in fibres properties. We could observe how diameter fibre increased, collector surface was widely covered, and fibre crystallinity decreased. Regarding to web properties, roughness decreased and colour turned into more whiteness. Glyoxal Poly (vinyl alcohol) KEY WORDS Nanofibres

show abstract

“…The melting point, Tm, of pure PVA is reported to be in the range of 200-220 °C. [45][46][47] Tm of PVA/Gr hydrogel is shifted to significantly higher temperatures (287 °C) with respect to PVA, indicating increased thermal stability due to incorporated graphene. Graphene and graphene-oxide nanofillers are known to improve thermal properties of polymer materials, often owing to the incorporation inside the hydrogel structure, as well as interactions with polymer chains that lead to lowered mobility and higher stability of the polymer matrix.…”

Section: Dsc Measurementsmentioning

confidence: 99%

Graphene Based Composite Hydrogel for Biomedical Applications

Nešović¹,

Abudabbus²,

Rhee³

et al. 2017

Croat. Chem. Acta

View full text Add to dashboard Cite

In this work, composite hydrogel consisting of poly(vinyl alcohol), graphene and silver nanoparticles, (Ag/PVA/Gr), was prepared by the immobilization of silver nanoparticles (AgNPs) in PVA/Gr hydrogel matrix in two steps. The first step was cross linking of the PVA/Gr colloid solution by the freezing/thawing method, while in the second step, in situ electrochemical method was used to incorporate AgNPs inside the PVA/Gr hydrogel matrix. We used UV-vis spectroscopy, cyclic voltammetry, Raman spectroscopy, DSC analysis, as well as test of cytotoxicity and antibacterial activity, to characterize obtained Ag/PVA/Gr hydrogel. It was shown that graphene-based composite hydrogel with incorporated AgNPs is non toxic biomaterial with antibacterial activity, with a potential for use in biomedical purposes.

show abstract

Differential scanning calorimetry of crystallized PVA hydrogels

Cited by 270 publications

References 3 publications

Effects of polymerization degree on recovery behavior of PVA/PVP hydrogels as potential articular cartilage prosthesis after fatigue test

Effects of polymerization degree on recovery behavior of PVA/PVP hydrogels as potential articular cartilage prosthesis after fatigue test

Influence of Glyoxal in the Physical Characterization of PVA Nanofibers

Graphene Based Composite Hydrogel for Biomedical Applications

Contact Info

Product

Resources

About