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Kinetic Analysis of Cryotropic Gelation of Poly(Vinyl Alcohol)/Water Solutions by Small-Angle Neutron Scattering

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Book cover Polymeric Cryogels

Part of the book series: Advances in Polymer Science ((POLYMER,volume 263))

Abstract

Graphical Abstract

Aqueous poly(vinyl alcohol) (PVA) solutions subjected to cryogenic treatment form strong physical gels. The cryogenic treatment basically consists of freezing an initially homogeneous polymer solution at low temperatures, storing in the frozen state for a definite time, and defrosting. These gels are of great interest for biotechnology, medicine, the food industry, and many other applications. The outstanding properties of these systems depend on a complex macroporous architecture, whereby PVA chains and water molecules are organized over different hierarchical length scales. The structure and the principal processes subtending the formation of these systems are discussed in the framework of our current understanding of polymer gels. These processes involve formation of ice crystals, PVA crystallization, liquid–liquid phase separation, hydrogen bonding, and entanglements. Small angle neutron scattering is used to follow the cryotropic gelation of PVA/water solutions and detailed information is extracted concerning the gelation mechanism and kinetic parameters related to the formation of these complex systems.

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Abbreviations

a-PS:

Atactic polystyrene

BP:

Berghmans point

CLSM:

Confocal laser scanning microscopy

C p :

Polymer concentration

\( \raisebox{1ex}{$ d\sigma $}\!\left/ \!\raisebox{-1ex}{$ d\varOmega $}\right. \) :

Scattering cross-section

d s :

Surface fractal dimension

DSC:

Differential scanning calorimetry

F :

Free energy

Φ〉:

Order parameter

f c(DSC):

Fractions of crystalline phase from DSC analysis

f c(NMR):

Fraction of rigid protons from NMR measurements

f c(XR):

Crystallinity index from WAXS analysis

LL:

Liquid–liquid phase separation

NMR:

Nuclear magnetic resonance

PEG:

Poly(ethylene glycol)

PVA:

Poly(vinyl alcohol)

q :

Scattering vector

SANS:

Small angle neutron scattering

SEM:

Scanning electronic microscopy

TEM:

Transmission electron microscopy

T g :

Glass transition temperature

T m :

Melting temperature

TR-SANS:

Time resolving-SANS

UCST:

Upper critical solution temperature

WAXS:

Wide angle X-ray scattering

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De Rosa, C., Auriemma, F., Di Girolamo, R. (2014). Kinetic Analysis of Cryotropic Gelation of Poly(Vinyl Alcohol)/Water Solutions by Small-Angle Neutron Scattering. In: Okay, O. (eds) Polymeric Cryogels. Advances in Polymer Science, vol 263. Springer, Cham. https://doi.org/10.1007/978-3-319-05846-7_4

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