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Organic Chemistry Nomenclature
Published in Arthur W. Hounslow, Water Quality Data, 2018
A typical example of a polyester is the fiber, Dacron®. It is synthesized by the condensation of teraphthalic acid and ethylene glycol with the elimination of water. Because it is made up of two different monomers, it is a copolymer. Acetate rayon, one of the first synthetic polymers, is a polyester made by reaction between cellulose (which has many hydroxyl groups) and acetic anhydride. Acetic acid is the molecule eliminated in this reaction. If one of the monomers used in the preparation of a polymer has three functional groups, it may form branched chains or cross links between polymer chains.
Personnel and Their Impact on Clean Room Operations
Published in Sandeep Nema, John D. Ludwig, Parenteral Medications, 2019
Dacron is made up of polyester fiber. It is considered to be an improvement over nylon as it is softer and drapes in a smoother fashion. The color is whiter than nylon and stays white after proper washing. It is also very wrinkle-free unless it is subjected to excessive heat. In the presence of excessive heat, it is likely to permanently wrinkle. A fire will melt the polyester rather than cause it to go up in flames. Moisture is absorbed at a very low rate of 0.2%–0.85%. The long wearability of these garments makes them favorable for clean room wear [4].
Atomic Bonding and Crystal Structure
Published in David W. Richerson, William E. Lee, Modern Ceramic Engineering, 2018
David W. Richerson, William E. Lee
Dacron is a linear polymer produced by condensation polymerization. It is synthesized from dimethyl terephthalate and ethylene glycol and forms methyl alcohol (CH3OH) as the by-product. The reaction is shown in Figure 4.15. Note that no carbon double bonds were broken in this case, just two C–O bonds on each dimethyl terephthalate and two C–OH bonds on each ethylene glycol.
Development of a three dimensional (3D) knitted scaffold for myocardial tissue engineering. Part I: mechanical performance of the knitted structures
Published in The Journal of The Textile Institute, 2025
The overall objective of this research was to design a textile based cardiac patch for myocardial tissue engineering applications. In order to achieve this goal, the textile structure of pile loop knit fabric (terry fabric) was selected as a three dimensional (3 D) scaffold. In this part of the study, a series of prototype structures was knitted from textured polyethylene terephthalate (PET) yarns that had two different filament numbers (48,144) in cross-section and the mechanical properties of the structures were analyzed. Furthermore, the pore network and the wettability of the knit structures were evaluated through an image analysis software, and using a goniometer, respectively. Since biocompatible polyethylene terephthalate (PET, Dacron) has many biomedical applications including vascular grafts it was chosen for the experiements (Matsuzaki et al., 2019; Pekkanen-Mattila et al., 2019; Tweden et al., 1995).
Electrospun POSS integrated poly(carbonate-urea)urethane provides appropriate surface and mechanical properties for the fabrication of small-diameter vascular grafts
Published in Journal of Biomaterials Science, Polymer Edition, 2022
Ziba Zakeri, Roya Salehi, Mehrdad Mahkam, Reza Rahbarghazi, Farhang Abbasi, Mostafa Rezaei
According to previously published data, engineered vascular grafts consisting of expanded polytetrafluoroethylene (PTFE, Teflon®) and polyethylene terephthalate (PET, Dacron®) have displayed satisfactory results in in vivo conditions. Despite these advantages, these composites yield satisfactory outcomes when are used for the fabrication of large-sized vascular grafts rather than small size vascular units with a diameter less than 6 mm [6, 7]. It was suggested that the lack of proper compliance and elasticity at pulsed pressures, the possibility of thrombus formation, and intimal hyperplasia are major drawbacks that restrict the application of PTFE and PET for the synthesis of small-sized vascular units [8, 9]. As a correlate, researchers and clinicians have tried to develop more biocompatible polymers for small-diameter vascular grafts with the possibility of being used in the clinical setting [10–12].
Physicochemical and mechanical properties of electrospun polyurethane composite patch integrated with green synthesized cobalt nanoparticles for cardiac applications
Published in The Journal of The Textile Institute, 2022
Nurul Asyiqah Binti Mohamad Khidhir, Saravana Kumar Jaganathan, Ahmad Zahran Mohd. Khudzari, Ahmad Fauzi Ismail
Nanofibres are used for the development of the cardiac patch. Cardiac patch is used for post-myocardial infarction application which acts as a scaffold to support and regenerate myocardium. A patch’s ability to induce the regeneration of cardiac tissue and heart refunction depends upon the patch’s physicochemical properties (Chen, 2018). Current patch materials are made up of either polymeric material or from a bovine origin. Synthetic polymers used in the manufacturing of cardiac patches and grafts are polyester (most commonly Dacron) and polytetrafluoroethylene (such as Gore-Tex®) (Jaganathan et al., 2014). The use of these synthetic polymers in biomedical applications is limited due to certain drawbacks like lack of cell affinity, lack of efficiency due to thrombus formation and low mechanical strength (Mi et al., 2018). It is evident that a single material cannot provide the required physicochemical and necessary biological properties which necessitates the manufacturing of composite materials with optimum properties.