The effect of varying molecular weight on the performance of HMMM-crosslinked polyester coatings

Sorce, Fabian S.; Shields, T.C.; Ngo, Sonny; Lowe, C. P.; Taylor, Alison

doi:10.1016/j.porgcoat.2020.105920

Cited by 4 publications

(4 citation statements)

References 43 publications

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“…The transparency of the cured network makes it even more desirable for use with transparent materials like glass. Solvolysis allows recovery of both the glass substrates and HMMM, which can be reused as a rubber additive, flame retardant, and cross-linker. − This work contributes to the growing body of materials that combine degradability and performance, and our mechanistic studies revealing the curing mechanism will prove useful in expanding the scope of sustainable polymer networks.…”

Section: Discussionmentioning

confidence: 99%

“…Hexamethylolmelamine (HMM) has been noted as an important intermediate in the formation of these networks and many additional alkoxy derivatives, such as hexakis(methoxymethyl)melamine (HMMM), can be readily derived from HMM . These triazines are used as cross-linkers and are common additives to enhance the flame retardancy of various polymers. − …”

Section: Introductionmentioning

confidence: 99%

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Degradable Melamine-Based Adhesives Using Dynamic Silyl Ether Bonds

Pierce,

Barroso,

et al. 2024

ACS Appl. Polym. Mater.

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Materials made from covalently cross-linked polymer networks are ubiquitous in everyday life but are difficult to process at the end of their life cycle. Therefore, it is essential to design materials with sustainability in mind to reduce the detrimental effects of plastic waste buildup. Functionalized triazines such as 1,3,5-triazine-2,4,6-triamine (melamine), hexamethylolmelamine (HMM), and hexakis(methoxymethyl)melamine (HMMM) are key components of robust thermosets, adhesives, and coatings. We combine HMM and HMMM with an alkoxysilane to produce transparent thermosets with remarkable glass adhesion. The dynamicity of silyl ether bonds in the network makes the materials susceptible to methanolysis, enabling the recovery of HMMM and the substrate. A combination of solutionand solid-phase techniques is used to elucidate both gelation and degradation pathways.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Degradable Melamine-Based Adhesives Using Dynamic Silyl Ether Bonds

Pierce,

Barroso,

et al. 2024

ACS Appl. Polym. Mater.

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“…Yoshida et al [5] used the T-bend test to assess how crosslinker content affects the formability of polyester-melamine coatings. Sorce et al [6] investigated the effects of molecular weight in polyester-melamine coatings and showed using the T-bend test that formability increases with an increase in molecular weight. Similarly, Kojima and Watanabe [7] used T-bends and an enamel rater to determine how the molecular weight between crosslinks affects the flexibility of a coating.…”

Section: Introductionmentioning

confidence: 99%

“…The rate of deformation applied in the T-bend test is much higher than the test rate in the Erichsen cupping test [6,9], in addition to the applied surface strains also being much higher [10,11]. It was shown by Ueda et al [12] that coatings were required to have a free film strain to failure greater than~200% to pass a 0T T-bend test despite determining that the applied strain in a 0T T-bend test was~100%.…”

Section: Introductionmentioning

confidence: 99%

Quantification and analysis of coating surface strains in T-bend tests

Sorce

Ngo

Lowe

et al. 2021

Int J Adv Manuf Technol

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Pre-painted sheet metal (e.g. coil coated with polyester-melamine) undergoes large deformations when formed into architectural cladding or white goods. The coatings provide protection and superior aesthetics, so must withstand failure by cracking or delamination during forming. The T-bend test is an industry standard test used to qualitatively compare the formability of coatings and mimics the conditions experienced during hemming processes. The failure of coatings during forming is strain governed, so understanding the surface strains in the T-bend test is of great interest to manufacturers. For the first time, the maximum surface strains experienced during the T-bend test have been predicted using finite element modelling (FEM) and verified experimentally using digital image correlation. The experimental shapes of the deformed blank are compared with the FEM results for further verification. In addition, a novel analytical model is proposed to determine the maximum surface strains. It is shown that strains of up to ~ 225% are applied during a 0T test (bent around a zero thickness spacer) reducing to ~ 23% at 4T (bent around a four times sheet thickness spacer). The finite element model, experimental data and new analytical model show excellent agreement and indicate that behaviour is independent of the substrate thickness or material used. Understanding the strain behaviour quantifies the formerly qualitative T-bend. This will improve the efficacy of the test, allowing metal formers and coating developers to better understand the performance requirements, to reduce waste and to develop better coatings. Graphical abstract

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Preparation of Polymer Latex Containing Infrared Dye and Its Application to the Preparation of Computer to Plate Precursors

Zhang

Qin

et al. 2022

Lecture Notes in Electrical Engineering

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The effect of varying molecular weight on the performance of HMMM-crosslinked polyester coatings

Cited by 4 publications

References 43 publications

Degradable Melamine-Based Adhesives Using Dynamic Silyl Ether Bonds

Degradable Melamine-Based Adhesives Using Dynamic Silyl Ether Bonds

Quantification and analysis of coating surface strains in T-bend tests

Preparation of Polymer Latex Containing Infrared Dye and Its Application to the Preparation of Computer to Plate Precursors

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