FTIR study of self-protonation and gel formation in pyridinic solutions of poly(4-vinylpyridine)

2000 ◽  
Vol 24 (3) ◽  
pp. 109-111 ◽  
Author(s):  
Mark Rozenberg ◽  
Evgenya Vaganova ◽  
Shlomo Yitzchaik
Keyword(s):  
Gel Formation ◽  
Ftir Study

In Situ ATR-FTIR Study of the Early Stages of Fly Ash Geopolymer Gel Formation

Langmuir ◽  
2007 ◽  
Vol 23 (17) ◽  
pp. 9076-9082 ◽  
Author(s):  
Catherine A. Rees ◽  
John L. Provis ◽  
Grant C. Lukey ◽  
Jannie S. J. van Deventer
Keyword(s):  
Fly Ash ◽  
Gel Formation ◽  
Ftir Study ◽  
Early Stages

Preparation of graft copolymers by the reaction of polymeric acyl chlorides with monohydroxy-terminated polymers: An introductory study

1988 ◽  
Vol 53 (8) ◽  
pp. 1735-1744 ◽  
Author(s):  
Jitka Horská ◽  
Jaroslav Stejskal ◽  
Pavel Kratochvíl ◽  
Aubrey D. Jenkins ◽  
Eugenia Tsartolia ◽  
...  
Keyword(s):  
Light Scattering ◽  
Chemical Composition ◽  
Statistical Model ◽  
Graft Copolymers ◽  
Coupling Reaction ◽  
Molecular Characteristics ◽  
Gel Formation ◽  
Acyl Chlorides ◽  
Molecular Weights

An attempt was made to prepare well-defined graft copolymers by the coupling reaction between acyl chloride groups located along the backbone chain and monohydroxy-terminated grafts prepared separately. The molecular weights and the parameters of heterogeneity in chemical composition of the products were determined by light scattering and osmometry. The determination of molecular characteristics revealed that the degree of grafting was low. The results therefore could not be confronted with a statistical model at this stage. The problems encountered in the synthesis, e.g., gel formation, and the data relating to the soluble products are discussed.

Assessment of gel formation in colloidal dispersions during mixing in turbulent jets

AIChE Journal ◽  
2013 ◽  
Vol 59 (12) ◽  
pp. 4567-4581 ◽  
Author(s):  
Miroslav Soos ◽  
Daniele L. Marchisio ◽  
Jan Sefcik
Keyword(s):  
Turbulent Jets ◽  
Colloidal Dispersions ◽  
Gel Formation

Acid-base properties and supramolecular structure ofN-[(hydroxymethyl)triazolyl]triflamides: DFT, ab initio, and FTIR study

2016 ◽  
Vol 30 (5) ◽  
pp. e3623 ◽  
Author(s):  
Bagrat A. Shainyan ◽  
Nina N. Chipanina ◽  
Larisa P. Oznobikhina ◽  
Vladimir I. Meshcheryakov
Keyword(s):  
Ab Initio ◽  
Supramolecular Structure ◽  
Acid Base ◽  
Ftir Study ◽  
Base Properties

scholarly journals Antioxidant Network Based on Sulfonated Polyhydroxyalkanoate and Tannic Acid Derivative

2021 ◽  
Vol 8 (1) ◽  
pp. 9
Author(s):  
Laura Brelle ◽  
Estelle Renard ◽  
Valerie Langlois
Keyword(s):  
Gallic Acid ◽  
Tannic Acid ◽  
Water Soluble ◽  
Gel Formation ◽  
Ene Reaction ◽  
Inorganic Cations ◽  
Medium Chain Length ◽  
Physically Crosslinked ◽  
The Stability ◽  
Derivatives Of

A novel generation of gels based on medium chain length poly(3-hydroxyalkanoate)s, mcl-PHAs, were developed by using ionic interactions. First, water soluble mcl-PHAs containing sulfonate groups were obtained by thiol-ene reaction in the presence of sodium-3-mercapto-1-ethanesulfonate. Anionic PHAs were physically crosslinked by divalent inorganic cations Ca2+, Ba2+, Mg2+ or by ammonium derivatives of gallic acid GA-N(CH3)3+ or tannic acid TA-N(CH3)3+. The ammonium derivatives were designed through the chemical modification of gallic acid GA or tannic acid TA with glycidyl trimethyl ammonium chloride (GTMA). The results clearly demonstrated that the formation of the networks depends on the nature of the cations. A low viscoelastic network having an elastic around 40 Pa is formed in the presence of Ca2+. Although the gel formation is not possible in the presence of GA-N(CH3)3+, the mechanical properties increased in the presence of TA-N(CH3)3+ with an elastic modulus G’ around 4200 Pa. The PHOSO3−/TA-N(CH3)3+ gels having antioxidant activity, due to the presence of tannic acid, remained stable for at least 5 months. Thus, the stability of these novel networks based on PHA encourage their use in the development of active biomaterials.

scholarly journals Gel Formation in Reversibly Cross-Linking Polymers

2021 ◽  
Author(s):  
Maud Formanek ◽  
Lorenzo Rovigatti ◽  
Emanuela Zaccarelli ◽  
Francesco Sciortino ◽  
Angel J. Moreno
Keyword(s):  
Cross Linking ◽  
Gel Formation

Effects of homopolymers on the gel formation in aqueous block copolymer solutions

1993 ◽  
Vol 26 (6) ◽  
pp. 1282-1286 ◽  
Author(s):  
Martin Malmsten ◽  
Bjoern Lindman
Keyword(s):  
Block Copolymer ◽  
Gel Formation
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