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Keywords = hexa(methoxymethyl)melamine

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18 pages, 3612 KiB  
Article
Curing of Poly(styrene-co-methyl methacrylate-co-2-hydroxyethyl methacrylate) Terpolymers in the Presence of Amino Compounds of Different Structures
by Tatyana A. Pugacheva, Vladimir G. Kurbatov, Evgeniy V. Vaganov, Georgiy V. Malkov, Ksenya A. Tarusina, Vlada M. Organ, Elena V. Mitrofanova, Alexander E. Tarasov and Elmira R. Badamshina
Polymers 2023, 15(9), 2187; https://doi.org/10.3390/polym15092187 - 4 May 2023
Viewed by 2118
Abstract
The process of curing the acrylic oligomers for rapid thermal curing coatings in the presence of hexa(methoxymethyl)melamine (HMMM), tetra(butoxymethyl)glycoluril (TBMG), and tetra(methoxymethyl)glycoluril (TMMG) has been studied. When HMMM is used as a hardener, the content of hydroxyl groups in the terpolymer and also [...] Read more.
The process of curing the acrylic oligomers for rapid thermal curing coatings in the presence of hexa(methoxymethyl)melamine (HMMM), tetra(butoxymethyl)glycoluril (TBMG), and tetra(methoxymethyl)glycoluril (TMMG) has been studied. When HMMM is used as a hardener, the content of hydroxyl groups in the terpolymer and also the crosslinking agent concentration have little effect on the initial cure rate. It has been established that during the curing of the TMMG composition, the amount of the network polymer and the initial curing rate decrease at short curing times only. It has also been revealed that the use of butoxy groups instead of methoxy groups as blocking agents leads both to a decrease in the initial cure rate and the gel fraction limiting value from 98 to 80%. When it comes to TBMG-containing compositions, a decrease in the part of hydroxyl groups in the copolymer leads to a significant fall in the initial curing rate and also in the gel fraction content. Regardless of the crosslinking agent used, an acceleration of the curing process is observed with an increase in the catalyst content in the compositions. Full article
(This article belongs to the Special Issue Polymer Coatings: Principles, Methods, and Applications)
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9 pages, 1831 KiB  
Article
Urethane Diols through Non-Isocyanate Approach and Their Application in MF Coating
by Kuanchen Huang, Zichen Ling and Qixin Zhou
J. Compos. Sci. 2021, 5(7), 194; https://doi.org/10.3390/jcs5070194 - 20 Jul 2021
Cited by 4 | Viewed by 2897
Abstract
In this work, two urethane diols with different middle chain lengths were prepared by the non-isocyanate approach from 1,4-diaminobutane or 1,6-diaminohexane with ethylene cyclic carbonate at room temperature without the aid of a catalyst. Different weight percentages of hexa(methoxymethyl) melamine (HMMM) crosslinker was [...] Read more.
In this work, two urethane diols with different middle chain lengths were prepared by the non-isocyanate approach from 1,4-diaminobutane or 1,6-diaminohexane with ethylene cyclic carbonate at room temperature without the aid of a catalyst. Different weight percentages of hexa(methoxymethyl) melamine (HMMM) crosslinker was mixed with urethane diols then cured under elevated temperature to generate the melamine-formaldehyde (MF) coating films. Two different linear diols without urethane linkage were chosen to crosslink with HMMM as the control group. The mechanical properties of these MF coatings were investigated by tensile test, adhesion test, and conical mandrel bend test. It was found that coatings incorporated with urethane diols exhibited enhanced mechanical properties and flexibility. These properties were also influenced by the weight percentage of HMMM crosslinker. This study provided a facile non-isocyanate way to produce urethane diols and successfully applied them in MF coating. Full article
(This article belongs to the Special Issue Polymer Composites and Fibers)
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11 pages, 1648 KiB  
Article
Graphene Oxide and Oxidized Carbon Black as Catalyst for Crosslinking of Phenolic Resins
by Maria Rosaria Acocella, Aniello Vittore, Mario Maggio, Gaetano Guerra, Luca Giannini and Luciano Tadiello
Polymers 2019, 11(8), 1330; https://doi.org/10.3390/polym11081330 - 10 Aug 2019
Cited by 12 | Viewed by 4128
Abstract
Influence of different graphite-based nanofillers on crosslinking reaction of resorcinol, as induced by hexa(methoxymethyl)melamine, is studied. Curing reactions leading from low molecular mass compounds to crosslinked insoluble networks are studied by indirect methods based on Differential Scanning Calorimetry. Reported results show a catalytic [...] Read more.
Influence of different graphite-based nanofillers on crosslinking reaction of resorcinol, as induced by hexa(methoxymethyl)melamine, is studied. Curing reactions leading from low molecular mass compounds to crosslinked insoluble networks are studied by indirect methods based on Differential Scanning Calorimetry. Reported results show a catalytic activity of graphene oxide (eGO) on this reaction, comparable to that one already described in the literature for curing of benzoxazine. For instance, for an eGO content of 2 wt %, the exothermic crosslinking DSC peak (upon heating at 10 °C/min) shifted 6 °C. More relevantly, oxidized carbon black (oCB) is much more effective as catalyst of the considered curing reaction. In fact, for an oCB content of 2 wt %, the crosslinking DSC peak can be shifted more than 30 °C and a nearly complete crosslinking is already achieved by thermal treatment at 120 °C. The possible origin of the higher catalytic activity of oCB with respect to eGO is discussed. Full article
(This article belongs to the Special Issue Catalytic Polymerization)
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