Synthesis And Physical Properties Of Polyperfluoroalkyletherurethanes PDF Download

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Synthesis and Physical Properties of Poly(Perfluoroalkylether)Urethanes

Synthesis and Physical Properties of Poly(Perfluoroalkylether)Urethanes
Author:
Publisher:
Total Pages: 44
Release: 1989
Genre:
ISBN:

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Polyurethane block copolymers were synthesized containing 33 and 50 wt% soft segment, and hard segment based on 4,4-diphenylmethane dissocyanate (MDI) chain extender. The soft segments were mixtures of poly(tetramethylene oxide) (PTMO) and poly(perfluoroalkylether) (PFEG) glycols (Mn=1000 and 1900, respectively), ranging from 4 to 100wt% PFEG. The PMTO polyol in one sample was substituted with a PMTO/ethylene oxide polyol (75:25 mole ratio) (Mn=1140). The MDEA-extended polymer was ionized using 1,3-propane sultone. The morphology, bulk, and surface properties of these polymers were evaluated by a variety of techniques. Differential scanning calorimetry and dynamic mechanical analysis showed that the incorporation of PFEG into the soft segment phase slightly enhanced the degree of phase separation. Polyurethanes; Poly(perfluoroalkylether); Mixed soft segment; Polymers; Organic chemistry.


Perfluoroalkyl Substances

Perfluoroalkyl Substances
Author: Bruno Améduri
Publisher: Royal Society of Chemistry
Total Pages: 651
Release: 2022-08-15
Genre: Science
ISBN: 1839167602

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Perfluoroalkyl substances (PFAS) are a diverse group of human-made chemicals that are used in a wide range of consumer and industrial products. They are under intense scrutiny due to environmental concerns and there is a call to ban new PFASs entering the market. That said, this book is not intended to wave the banner against PFASs per se; rather it provides a balanced overview of the field, from basic synthesis through to applications, why some current PFASs are and may remain the right substance for the job, as well as addressing the challenges and alternatives. Covering organofluorine chemistry to fluoropolymers and their applications in various sectors from biomedical to agrochemical, energy and electrical industries, this book is a solid introduction to the topic and demonstrates why fluorinated products are still useful in many domains. With risk assessment and alternatives to PFASs included, it provides a considered account of both the positive applications of PFASs and the pressing environmental concerns. Suitable for academics and industrial practitioners working in the fields of organic and macromolecular chemistries, it will also appeal to end-users who want to learn about the technology, applications and elimination or recycling of such fluorinated products.


Well-Architectured Fluoropolymers: Synthesis, Properties and Applications

Well-Architectured Fluoropolymers: Synthesis, Properties and Applications
Author: Bruno Ameduri
Publisher: Elsevier
Total Pages: 499
Release: 2004-07-07
Genre: Technology & Engineering
ISBN: 0080474829

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Because of the increasing need for ever better performing materials endowed with specific properties, macromolecular engineering has become a useful tool for designing well-architectured polymers (telomers, telechelics, stars, dendrimers, alternating, block- and graftcopolymers). These polymers are nowadays seeing an enormous growth. Among them, fluoropolymers are seen as high value added materials in many applications ranging from surfactants, optical fibers, biomaterials, coatings, to membranes for fuel cells. Indeed, the relationship between structure of the monomer to the properties of the polymers is of increasing interest so that these properties are tuned for the most appropriate applications. As most fluoropolymers are prepared from radical synthesis, this book devotes various parts on the use of the controlled radical (or pseudo-living) polymerisation of fluoromonomers leading to discoveries of thermoplastic elastomers or original surfactants for polymerisation in supercritical CO2. Well-Architectured Fluoropolymers: Synthesis, Properties and Applications is composed of five chapters starting with a general introduction outlining basic concepts. Emphasis is placed on recent developments, and each chapter describes comprehensive techniques of synthesis of well-defined fluorotelomers or polymers, their properties, characterisations, and their applications, for immediate use by today’s engineers, industrial and academic scientists, and researchers. The book has been arranged to enable self-managed reading and learning. It is both a source of data and a reference. On the synthesis, properties and applications of fluoropolymers: remarkable, high value added materials applied in surfactants, optical fibres, biomaterials, coatings and membranes for fuel cells For immediate use by today's engineers, industrial and academic scientists, and researchers Written to enable self-managed reading and learning, being both a source of data and a reference


Government Reports Annual Index

Government Reports Annual Index
Author:
Publisher:
Total Pages: 1312
Release: 1990
Genre: Government reports announcements & index
ISBN:

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NASA Patent Abstracts Bibliography

NASA Patent Abstracts Bibliography
Author: United States. National Aeronautics and Space Administration Scientific and Technical Information Branch
Publisher:
Total Pages: 514
Release: 1987
Genre: Astronautics
ISBN:

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NASA Patent Abstracts Bibliography

NASA Patent Abstracts Bibliography
Author: United States. National Aeronautics and Space Administration Scientific and Technical Information Division
Publisher:
Total Pages: 628
Release: 1991
Genre: Astronautics
ISBN:

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