نتایج جستجو برای: poly urethane pu

تعداد نتایج: 92583  

2011
Hiroto Hayashi Yoshio Yanagishita Shuichi Matsumura

Novel poly(ester-urethane)s were prepared by a synthetic route using a lipase that avoids the use of hazardous diisocyanate. The urethane linkage was formed by the reaction of phenyl carbonate with amino acids and amino alcohols that produced urethane-containing diacids and hydroxy acids, respectively. The urethane diacid underwent polymerization with polyethylene glycol and α,ω-alkanediols and...

2009
Igor V. Khudyakov David Zopf Nicholas J. Turro

This review describes the present state of science and technology of photopolymerizable (UV-curable) polyurethane (PU) nanocomposites which include nanosilica and organically-modified clay (organoclay). A number of documented improvements of properties of PU nanocomposites compared to the pristine PU are presented. Many data on the structure and properties of PU nanocomposites were obtained not...

2017
Flávia Cristina Assis Silva Rodrigo Azevedo dos Reis Luciano Tavares Costa

Abstract: Polymer based membranes for gas capture and separation have been investigated as alternative to the conventional systems, mainly in processes applied by petrochemical and refinery areas [1]. Due to their versatility, poly(urethane) (PU) and poly(urethane-urea) (PUU) have been studied as good candidates to be applied on gas capture/separation [2,3]. Molecular dynamics (MD) simulations ...

Journal: :Biomacromolecules 2007
Xian Jun Loh Suat Hong Goh Jun Li

New biodegradable multiblock amphiphilic and thermosensitive poly(ether ester urethane)s consisting of poly[(R)-3-hydroxybutyrate] (PHB), poly(ethylene glycol) (PEG), and poly(propylene glycol) (PPG) blocks were synthesized, and their aqueous solutions were found to undergo a reversible sol-gel transition upon temperature change at very low copolymer concentrations. The multiblock poly(ether es...

2015
Lara Yildirimer Asma Buanz Simon Gaisford Edward L. Malins C. Remzi Becer Naiem Moiemen Gary M. Reynolds Alexander M. Seifalian

Biodegradable elastomers are a popular choice for tissue engineering scaffolds, particularly in mechanically challenging settings (e.g. the skin). As the optimal rate of scaffold degradation depends on the tissue type to be regenerated, next-generation scaffolds must demonstrate tuneable degradation patterns. Previous investigations mainly focussed on the integration of more or less hydrolysabl...

Journal: :Continuum Mechanics and Thermodynamics 2022

Abstract The chemical structure, polymer mobility and mechanical properties are studied for a cross-linked amorphous poly(ether urethane) (PU) from glass transition to rubber elasticity juvenile dry samples water-saturated states after exposure humid air (r.h. = 29, 67, 95, 100%) at $$60~^\circ \hbox {C}$$ 60 ...

2011
Gary T. Howard

Polyurethanes represent a class of polymers that have found a widespread use in the medical, automotive and industrial fields. Polyurethanes can be found in products such as furniture, coatings, adhesives, constructional materials, fibers, paddings, paints, elastomers and synthetic skins. Polyurethane is abbreviated as PUR in compliance with official German and International standards. However,...

Journal: :Journal of Adhesion Science and Technology 2021

Waterborne poly(urethane urea)s (PUDs) containing graphene derivatives with different morphologies and surface polarities were synthesized via in situ polymerization by using the acetone method. Sm...

Journal: :Polymer Chemistry 2021

Partly bio-based thermoplastic poly(cycloacetal-urethane)s synthesized and melt-spun into textile fibres that can be potentially chemically recycled.

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