Polyurethanes

Janik, Helena; Sienkiewicz, Maciej; Kucińska-Lipka, Justyna

doi:10.1016/b978-1-4557-3107-7.00009-9

Cited by 38 publications

(29 citation statements)

References 183 publications

(94 reference statements)

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“…Commonly, thermal insulation materials are composed of organic polymers, such as polyurethane foam, polystyrene foam, glass wool, etc. Polyurethane foam can be divided into two categories: flexible polyurethane foam and rigid polyurethane foam (Septevani, Evans, Chaleat, Martin, & Annamalai, 2015), and is often used as thermal insulation materials in the building envelop and domestic refrigerators (Janik, Sienkiewicz, & Kucinska-Lipka, 2014). However, the production of polyurethane foam relies on the unsustainable petroleum sources, as its two main components are isocyanates and polyether.…”

Section: Introductionmentioning

confidence: 99%

Thermal conductivity, structure and mechanical properties of konjac glucomannan/starch based aerogel strengthened by wheat straw

Wang

Xiao

et al. 2018

Carbohydrate Polymers

116

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This study presents the preparation and property characterization of a konjac glucomannan (KGM)/starch based aerogel as a thermal insulation material. Wheat straw powders (a kind of agricultural waste) and starch are used to enhance aerogel physical properties such as mechanical strength and pore size distribution. Aerogel samples were made using environmentally friendly sol-gel and freeze drying methods. Results show that starch addition could strengthen the mechanical strength of aerogel significantly, and wheat straw addition could decrease aerogel pore size due to its special micron-cavity structure, with appropriate gelatin addition as the stabilizer. The aerogel formula was optimized to achieve lowest thermal conductivity and good thermal stability. Within the experimental range, aerogel with the optimized formula had a thermal conductivity 0.04641 Wm K, a compression modulus 67.5 kPa and an elasticity 0.27. The results demonstrate the high potential of KGM/starch based aerogels enhanced with wheat straw for application in thermal insulation.

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Section: Introductionmentioning

confidence: 99%

Thermal conductivity, structure and mechanical properties of konjac glucomannan/starch based aerogel strengthened by wheat straw

Wang

Xiao

et al. 2018

Carbohydrate Polymers

116

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“…42 The porous network is controlled by varying process parameters such as polymer concentration, temperature, and the composition of the solvent or non-solvent. Tienen et al 15 pointed out that, upon cooling to −20°C or −80°C, dimethyl sulfoxide solutions of a polyester-urethane-urea are crystallized, and, after washing, a highly porous scaffold was obtained. One disadvantage of this technique is that the pore diameters of the scaffold are in the very broad range of 0.1–200 µm.…”

Section: Introductionmentioning

confidence: 99%

Porosity and swelling properties of novel polyurethane–ascorbic acid scaffolds prepared by different procedures for potential use in bone tissue engineering

Kucińska-Lipka

Marzec

Gubańska

et al. 2016

Journal of Elastomers & Plastics

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In this work, a novel polyurethane (PU) system based on poly(ethylene-butylene) adipate diol, 1,6-hexamethylene diisocyanate, 1,4-butanediol, and ascorbic acid was used to prepare scaffolds with potential applications in bone tissue engineering. Two fabrication methods to obtain porous materials were chosen: phase separation (PS)/salt particle leaching (PL) and solvent casting (SC)/salt PL. The calculated porosity demonstrated that scaffolds with a higher porosity were obtained (76–86%) using the PS/PL method. The morphology of pores was examined with the use of optical stereomicroscope and scanning electron microscope. The appropriate porosity, pore morphology, and swelling properties for bone tissue scaffolds were obtained for our novel PU system by the PS/PL method using 15 wt% solution of PU in the mixture of dimethylformamide (DMF)/tetrahydrofuran solvents and by SC/PL method from 20 wt% from DMF. The distilled water and saline water swelling for those samples was also appropriate for bone tissue scaffold application.

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“…Thermoplastic polyurethane (TPU) is a class of polyurethane plastics with many attractive properties for packaging, including elasticity, transparency and resistance to oil, grease and abrasion (Janik, Sienkiewicz, & Kucinska‐Lipka, 2014). Technically, TPUs are thermoplastic elastomers consisting of linear segmented block copolymers composed of hard and soft segments.…”

Section: Polymeric Materials Used For Long‐term Medical Implantsmentioning

confidence: 99%

Non‐hermetic packaging of biomedical microsystems from a materials perspective: A review

et al. 2020

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Traditionally, implantable electronic devices have used metal-based hermetic encapsulation to protect the internal components from damage by the aggressive in vivo environment. Concurrently, hermetic encapsulation protects the surrounding tissue from harmful substances that might be leached from the packaged components (Bazaka & Jacob, 2012). In some cases, however, there is risk of electrochemical corrosion on the metallic surfaces because of the presence of various ions, amino acids, proteins and dissolved oxygen (Eliaz, 2019). Hermeticity is defined as the ability of sealed packages to resist foreign gases and liquids from penetrating the seal or encapsulating material (Madduri, Sammakia, Infantolino, & Chaparala, 2008). Hermetic packages are conventionally made from glass, metal or ceramic materials whereby the gas and moisture permeability through the material is negligible (Madduri et al., 2008; Schuettler, Schatz, Ordonez, & Stieglitz, 2011). Hermetic materials have been successfully used to package devices for chronic applications, some of the most notable being cochlear implants and cardiac pacemakers (Kirsten, Wetterling, Uhlemann, Wolter, & Zigler, 2013). Titanium is the most commonly used metal for hermetic encapsulation because of its biocompatibility, low permeability for ions and moisture, mechanical durability and the ability to create viable hermetic seals by laser welding (Amanat, James, & McKenzie, 2010). Ceramics have also been used for implants for wireless devices to address issues related to attenuation of electromagnetic transmission by metallic packaging (El Khatib, Pothier, Crunteanu, & Blondy, 2007; Schubring & Fujita, 2007; Shen & Maharbiz, 2019). Driven by the increased functionality and scalability offered by innovations in application-specific integrated circuits (ASICs) and the desire to create highly miniaturized devices on flexible polymer substrates, significant efforts have been made in creating miniaturized implants by integrating the majority of components on a single chip. As the

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Polyurethanes

Cited by 38 publications

References 183 publications

Thermal conductivity, structure and mechanical properties of konjac glucomannan/starch based aerogel strengthened by wheat straw

Thermal conductivity, structure and mechanical properties of konjac glucomannan/starch based aerogel strengthened by wheat straw

Porosity and swelling properties of novel polyurethane–ascorbic acid scaffolds prepared by different procedures for potential use in bone tissue engineering

Non‐hermetic packaging of biomedical microsystems from a materials perspective: A review

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