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The role of crosslinking agents in the process of fast thermal curing of polyester resin

100%

Denisova N. , Kudinikina I. , Vlasova N. , Ilyin A.

Farby i Lakiery

2014

tom nr 6

7--11

The influence of the crosslinking agent type and amount on the process of fast thermal curing and on the properties of polyester coatings were investigated. Hexa(methoxy-methyl)melamine (НМММ) and tetra(methoxymethyl)melamine (ТМММ) were used as crosslinking agents for the polyester resin. The process of the polyester/melamine system crosslinking was studied by sol-gel analysis and ATR-FTIR Spectroscopy. The coatings with ТМММ differed from the coatings with НМММ, the latter having improved hardness, MEK resistance and higher glass transition temperature. However, they were inferior in terms of elasticity and adhesion. The necessary balance of all the above mentioned physical and mechanical properties was obtained for the films with the methoxy- / hydroxy-group ratio of 3,4 for НМММ and 2,3 for ТМММ.

THE FORMATION OF HYDROGELS BASED ON CHITOSAN AND ITS WATER-SOLUBLE DERIVATIVES

86%

Il’ina A. V. , Shagdarova B. T. , Lunkov A. P. , Varlamov V. P.

Progress on Chemistry and Application of Chitin and its Derivatives

2020

tom 25

5 - 15

This review considers articles on the formation of hydrogels based on chitosan as well as succinylated and quaternized chitosan derivatives. They are synthesized using low toxicity reagents, under ordinary conditions (low production costs). Chitosan derivatives are soluble in an extended range of pH values and characterized by mucoadhesiveness, bioavailability and biodegradability, which extends the potential of their medical applications. One of the most important properties of chitosan and its derivatives is the ability to form hydrogels. Depending on the nature of the bonds that occur during formation, hydrogels are divided into chemically or physically crosslinked, or a mixture of the two. Chemically crosslinked gels have covalent bonds, while physically crosslinked gels are formed by noncovalent interactions, for example, ionic. Mixed hydrogels have both types of crosslinking.

Wodne samoprzylepne dyspersje poliuretanowe

72%

Czech Z. , Koćmierowska M.

Elastomery

2006

tom T. 10, nr 5

9-13

W artykule przedstawiono opis wstępnych badań własnych dotyczących otrzymywania i zastosowania dyspersji poliuretanowych. Przedstawiono klasyfikację klejów samoprzylepnych ze szczególnym uwzględnieniem klejów poliuretanowych. Omówiono otrzymywanie dyspersji poliuretanowych metodami acetonową, prepolimerowo-jonomerową i "w stopie". Wymieniono dziedziny zastosowań dyspersyjnych poliuretanowych klejów samoprzylepnych.

Methods of synthesis and areas of application of aqueous dispersion polyurethanes are revired bads on literature data. Outline classification of adhesives, with pressure-sensitive polyurethane adhesives. Three methods of making PU dispersions are described: acetone process, prepolymer-ionomer process and melt process. It charge the area can be applied on polyurethane dispersions pressure-sensitive adhesives.