Results 211 to 220 of about 27,413 (265)

Microbial degradation of polyurethane, polyester polyurethanes and polyether polyurethanes

Applied Microbiology and Biotechnology, 1999
Polyurethane (PUR) is a polymer derived from the condensation of polyisocyanate and polyol and it is widely used as a base material in various industries. PUR, in particular, polyester PUR, is known to be vulnerable to microbial attack. Recently, environmental pollution by plastic wastes has become a serious issue and polyester PUR had attracted ...
Toshiaki Nakajima-Kambe, Nobuhiko Nomura, Yukie Shigeno-Akutsu, Fumiko Onuma, Tadaatsu Nakahara   +4 more
openaire   +3 more sources

Developments in Metal‐Containing Polyurethanes, Co‐polyurethanes and Polyurethane Ionomers

Journal of Macromolecular Science, Part C: Polymer Reviews, 2005
The growth of science and technology of polyurethanes leads to the development of new materials with more desirable properties. Such kinds of materials include metal‐containing polyurethanes, poly(urethane‐urea)s, poly(urethane‐ether)s, poly(urethane‐ester)s, poly(urethane‐ether‐ester)s, poly(urethane‐imide)s, and polyurethane ionomers with isocyanate ...
Rangasamy Jayakumar, Mani Prabaharan, S. Nanjundan   +2 more
openaire   +2 more sources

Biomedical Applications of Polyurethane Hydrogels, Polyurethane Aerogels, and Polyurethane-graphene Nanocomposite Materials

Central Nervous System Agents in Medicinal Chemistry, 2022
Background: The emergence of new diseases poses therapeutic challenges in modern medicine. Polyurethane hydrogels that comprise polyol, copolymer and extender could be prepared from diverse chemical compounds with adjuvants such as ascorbic acid and sorbitol, among others.
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Polyurethanes and Silicone Polyurethane Copolymers

2011
Polyurethanes and silicone-containing polyurethanes have a long history of use in medical devices and prosthetic implants. Initially, device designers adopted commercially available polymers that were developed for a variety of industrial applications including textiles and even shoe soles. One first-generation silicone–urethane hybrid (Avcothane™-51),
R.S. Ward, R.L. Jones
openaire   +2 more sources

Interaction of segmented polyurethanes and polyurethane‐ureas with water

Makromolekulare Chemie. Macromolecular Symposia, 1992
AbstractSorption of water vapor by oligomeric homopolymers and triblock copolymers of ethylene oxide and propylene oxide, and by polyurethanes and polyurethane ‐ ureas derived from them is discussed. While the sorption isotherms (plots of ψ1 vs a1, where ψ is he volume fraction of sorbed water and a1 is activity) for most polymers investigated here are
Lubomír Šimek, Stanislav Petřík, Miloslav Bohdanecký, František Hadobaš   +3 more
openaire   +2 more sources

Waterborne polyurethane and modified polyurethane acrylate composites

Plastics, Rubber and Composites, 2010
AbstractWaterborne polyurethane (PU) and a series of PU acrylate (PUA) composite dispersions were synthesised from isophorone diisocyanate, polyester polyols, dimethylol propionic acid, hydroxyethyl methyl acrylate, butyl acrylate and methyl acrylate.
Fengxian Qiu, D. M. Wu, J. L. Zhang, D. Y. Yang   +3 more
openaire   +2 more sources

STUDIES ON ZINC-CONTAINING POLYURETHANES AND POLYURETHANE-UREAS

Journal of Macromolecular Science, Part A, 2002
ABSTRACT Zinc salt of mono(hydroxypentyl)phthalate [Zn[HPP]2] was synthesized by reacting 1,5-pentane diol, phthalic anhydride and zinc acetate. Zinc containing polyurethanes having ionic linkages in the main chain were synthesized by the polyaddition reaction of hexamethylene diisocyanate (HMDI) or toluylene 2,4-diisocyanate (TDI) with Zn[HPP]2, using
Rangasamy Jayakumar, S. Nanjundan, S. Radhakrishnan, R. Arun Prasath   +3 more
openaire   +2 more sources

Synthesis and antithrombogenicity of anionic polyurethanes and heparin‐bound polyurethanes

Journal of Biomedical Materials Research, 1986
AbstractTwo kinds of novel antithrombogenic polyurethane materials were synthesized. One of them is a polyetherurethane with anionic charges on the film surface, and the other is a polyetherurethaneurea to which heparin was covalently bound. The mechanism of their antithrombogenicity was investigated.
Yukio Imanishi, Yoshihiro Ito, Masahiko Sisido   +2 more
openaire   +3 more sources

1.26 Polyurethanes and Silicone Polyurethane Copolymers

2017
Polyurethanes and silicone-containing polyurethanes have a long history of use in medical devices and prosthetic implants. Initially, device designers adopted commercially available polymers that were developed for a variety of industrial applications including textiles and even shoe soles. One first-generation silicone–urethane hybrid (Avcothane™-51),
R.S. Ward, R.L. Jones
openaire   +2 more sources

Sustainability in Polyurethane Synthesis and Bio-based Polyurethanes

2020
Increasing environmental problems and economic and environmental problems associated with global warming, waste management problems, decreasing fossil resources, fluctuations in oil prices, and dependence on oil have led to an increase in research for renewable and sustainable new materials that are friendly to our health and environment. These studies
Emine Dilara Kocak, Zehra Yildiz, Hilal Olcay   +2 more
openaire   +2 more sources