Thermosetting Foams

Ashida, K.; Iwasaki, Kadzuo

doi:10.1016/b978-081551357-5.50004-8

Cited by 18 publications

(8 citation statements)

References 52 publications

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“…PU foams are produced by the addition of polymerisation of diisocyanates with hydroxyl-terminated aliphatic polyester or polyether monomers (polyols) or with a combination of a polyol and a short-chain diol extender in the presence of a catalyst and water. Carbon dioxide gas, functioning as a blowing agent, is formed by the reaction of diisocyanate groups with water [7,8]. Flexible PU foams are produced by oneshot processes where the polyol, catalysts, surfactant, and water are pre-mixed together, followed by mixing with isocyanate monomer.…”

Section: Polyurethane Foams With Integral Skinmentioning

confidence: 99%

“…The selected mixing ratio was then characterised in terms of free rise specific events, based on average values, from five samples. According to ASTM D7487-13 and [8], the instant the mixture starts to rise indicates the beginning of foam reaction, which is usually associated with the cream time. Other indicative phenomena include carbon dioxide generation, foaming, colour change, and viscosity.…”

Section: Free Rise Foam Evaluation and Characterisationmentioning

confidence: 99%

“…Common strategies include the dispersion of functionalised carbon nano-tubes, carbon black, and graphene [9, 10], or the use of conductive polymers (e.g., polyaniline, polythiophene) [11], or by dispersion of metal salts (e.g., phosphonic groups) [11], or oligomers (e.g., tetraaniline) [12]. Besides enabling ESD protection, with proper formulation, the normal manufacturing process of PU foams allows generating flexible shapes facilitating the cushioning customisation [8]. Due to this versatility, flexible foams, such as PU, have been used extensively as a packaging and supporting material of highly sensitive equipment such as ESDS.…”

Section: Introductionmentioning

confidence: 99%

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Development of functionalised foam for electrostatic discharge applications

Silva

Lima

Rodrigues

et al. 2020

Plastics, Rubber and Composites

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Electrostatic discharge-sensitive devices (ESDS) consist of electronic systems that are easily damaged by electrostatic fields or discharges. To safely stow and transit the ESDS, Bosch Car Multimedia S.A. resorts to thermoformed trays with a specific design for each product configuration. Although efficient, the solutions' specificity arose logistic issues that created the need for an alternative approach. This paper reports the investigation for the development of a flexible tray, based on an electrostatic-dissipative integral skin foam. First, a commercial integral skin polyurethane foam was evaluated by varying components mixing ratio. Once achieved a suitable combination of hardness and density, post-formulation additives (colour and anti-static) were investigated. Free expansion foaming stages were assessed and cured foams were characterised in terms of electrostatic discharge protection. Moulded foams with variable patterns were developed and evaluated considering the application purpose requirements. Real-scale prototypes of the most adequate concept design were produced and analysed.

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Section: Polyurethane Foams With Integral Skinmentioning

confidence: 99%

Section: Free Rise Foam Evaluation and Characterisationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Development of functionalised foam for electrostatic discharge applications

Silva

Lima

Rodrigues

et al. 2020

Plastics, Rubber and Composites

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“…The resulting materials are interpenetrating networks comprised of two or more disparate crosslinked polymers that are held together through physical interactions. [236] Li et al leveraged this approach and synthesized interpenetrating network gels that incorporated Eosin Y photocatalytic motifs (~2.4 mol% Eosin Y across both networks). [233] The gels showed good control over dispersity (Đ < 1.2) for molecular weights on the order of M n � 20,000 g/mol and only a 12 % decline was found in conversion over 6 reuse cycles for PET-RAFT polymerization of dimethyl acrylamide.…”

Section: Interpenetrating Polymer Networkmentioning

confidence: 99%

Heterogeneous Photocatalysts for Light‐Mediated Reversible Deactivation Radical Polymerization

et al. 2023

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Heterogeneous photocatalysis combines the benefits of light‐mediated chemistry with that of a catalytic platform that facilitates re‐use of (often expensive) photocatalysts. This provides significant opportunities towards more economical, sustainable, safe, and user‐friendly chemical syntheses of both small and macromolecular compounds. This contribution outlines recent developments in the design of heterogenous photocatalysts and their use to mediate polymerizations. We outline four classes of heterogeneous photocatalysts in detail: nanoparticles, conjugated and non‐conjugated polymer networks, metal‐organic frameworks (MOFs), and functionalized solid supports.

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“…Two processes can be used in commercial polyurethane synthesis: one-shot and prepolymer. As indicated by Schollenberger, both methods have unique applications; one shot synthesis tends to be cheaper to manufacture and is commonly used to produce thermosetting polymers, whereas prepolymer synthesis allows for better control of block segmentation and molecular weight but is more complex. , Recent research has explored methods to create solvent free, − bioderived, − isocyanate free, or functionalized ,,,,− polyurethanes that impart antimicrobial, − antifungal, and color fixing character. Indeed, the nature of polyurethane’s chemistry enables the introduction of functional blocks so long as they have ester or ether end groups.…”

Section: Coating Chemistrymentioning

confidence: 99%

Advances in Nonfouling and Antimicrobial Coatings: Perspectives for the Food Industry

Rudlong

Koga

Goddard

2022

ACS Food Sci. Technol.

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Microbial cross-contamination represents a significant burden to public health and food wasted due to microbial spoilage. Despite established protocols for cleaning and sanitizing surfaces and advances in antimicrobial and nonfouling coatings research, the persistence of pathogenic and spoilage microorganisms remains a challenge in food manufacturing. Specifically, the design and application of antimicrobial and nonfouling coatings in nonfood contact regions of food manufacturing facilities remain an area of research need as these regions are known microbial growth niches. In this review, we survey the state-of-the-art antimicrobial and nonfouling technologies compatible with polyurethane and epoxy coatings suitable for Zone 2/3 regions, such as drain ditches and equipment framework. The properties of polyurethane and epoxy coatings are discussed, followed by a detailed survey of antimicrobial and nonfouling compounds suitable for incorporation into polyurethane and epoxy polymerization chemistries. Challenges and opportunities in the application of antimicrobial and nonfouling coatings to Zones 2/3 are discussed, with an emphasis placed on the design of effective application studies.

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Thermosetting Foams

Cited by 18 publications

References 52 publications

Development of functionalised foam for electrostatic discharge applications

Development of functionalised foam for electrostatic discharge applications

Heterogeneous Photocatalysts for Light‐Mediated Reversible Deactivation Radical Polymerization

Advances in Nonfouling and Antimicrobial Coatings: Perspectives for the Food Industry

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