Synthesis and Characterization of Flexible Polyurethane Foam from Liquid Natural Rubber-based Polyol PDF Download
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Author: Siti Zaleha Hj Isa
Publisher:
ISBN:
Category : Polyols
Languages : en
Pages : 252
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Book Description
Author: Siti Zaleha Hj Isa
Publisher:
ISBN:
Category : Polyols
Languages : en
Pages : 252
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Book Description
Author: Anuwat Saetung
Publisher:
ISBN:
Category :
Languages : en
Pages : 191
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Book Description
Polyurethane foam (PUF) is the largest of polyurethane materials widely studied and used in many applications such as furniture, automobile, insulation, acoustic absorber. Hydroxyl compounds currently used in the production of PUF are petrochemical products (polyester and polyether polyols). However, they have some disadvantages as they are non-renewable resources, they may cause environmental pollution, and they tend to be exhausted in the near future. Natural rubber (NR) is an interesting choice to use as a starting material in PUF synthesis, due to the fact that they are renewable source, abundant polymer and they have good mechanical properties and are easy to chemically modify. In this work, a new hydroxytelechelic natural rubber (HTNR) having a hydroxyl functionality of 2 was successfully performed via controlled epoxidation and cleavage of natural rubber, following by a selective reduction reaction of the obtained carbonyltelechelic oligoisoprenes. These HTNR with different molecula r weights (1000-3400 g mol-1) were reproducible obtained with high yields. Chemical modifications on HTNR were performed by epoxidation (10-35%, EHTNR), hydrogenation and oxirane opening reactions. The different microstructures of these oligomers were evidenced by the characterization techniques FT-IR, NMR, SEC and MALDI-TOF MS. Their thermal properties were also investigated by TGA and DSC. Polyurethane foams were successfully prepared from a renewable source, HTNR with different molecular weights and EHTNR having a variation of epoxide content, by one shot technique. The chemical structure and cell structure as well as physico-mechanical, thermal and acoustic properties were characterized to compare with commercial polyol analogues. It was investigated that the obtained HTNR based foams are open cell structures and have cell dimensions between 0.38 and 0.47 mm. Concerning, physico-mechanical properties, HTNR1000 based foam exhibits higher tensile and compressive strengths than commercial polyol analogue, but the elongation at break is lower. However, HTNR3400 based foam shows the best for elastic properties. In series of EHTNR based foams, the tensile and compressive strengths give a trendy increasing with increasing the epoxide content. Same results were observed with increasing amount of 1,4-butanediol. For thermal properties, HTNR based foams show better low temperature flexibility than that based on commercial polyol. Moreover, HTNR based polyurethane foams give an excellent acoustic absorber.
Author: Chris Defonseka
Publisher: Walter de Gruyter GmbH & Co KG
ISBN: 3110639831
Category : Technology & Engineering
Languages : en
Pages : 277
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Book Description
Flexible and viscoelastic polyurethane foams have enormous potential as viable business ventures and have replaced many traditional materials used in everyday life. This book describes the chemistry of flexible and viscoelastic polyurethane foams as well as calculations and formulating methodology for quality production. The author presents detailed information on foam manufacturing, based on over 45 years of hands-on industry experience.
Author: Yebo Li
Publisher: Springer
ISBN: 3319215396
Category : Technology & Engineering
Languages : en
Pages : 86
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Book Description
This brief outlines the most recent advances in the production of polyols and polyurethanes from renewable resources, mainly vegetable oils, lignocellulosic biomass, starch, and protein. The typical processes for the production of polyols from each of the above mentioned feedstocks are introduced and the properties of the resultant polyols and polyurethanes are also discussed.
Author: Malik Shoaib Suleman
Publisher: LAP Lambert Academic Publishing
ISBN: 9783659749643
Category :
Languages : en
Pages : 76
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Book Description
Polyurethanes are versatile materials with variety of applications. The major application of polyurethanes is polyurethane foam. In polyurethane foams there are many types and this work is carried out on synthesis and characterization of visco-elastic polyurethane foam which is the sub type of flexible polyurethane foam. Visco-elastic foam have unique characteristics than other type of foams and due to its variety of applications it is now a days capturing the whole commercial applications of flexible foam. Due to its importance and large number of applications this research is carried out to synthesize visco-elastic polyurethane foam on lab scale and to study different methods for synthesis of visco-elatic polyurethane foam. The objective of this work was to synthesize visco-elastic polyurethane foam and then study different characterization techniques for the caharacterization of visco-elastic foam.
Author: Nik Nurfatimah PZ Nik Pauzi
Publisher:
ISBN:
Category : Polyurethanes
Languages : en
Pages : 117
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Author: G. Woods
Publisher: Springer
ISBN:
Category : Science
Languages : en
Pages : 360
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Book Description
Author: Sabu Thomas
Publisher: William Andrew
ISBN: 0323511341
Category : Technology & Engineering
Languages : en
Pages : 147
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Book Description
Recycling of Polyurethane Foams introduces the main degradation/depolymerization processes and pathways of polyurethane foam materials, focusing on industrial case studies and academic reviews from recent research and development projects. The book can aid practitioners in understanding the basis of polymer degradation and its relationship with industrial processes, which can be of substantial value to industrial complexes the world over. The main pathways of polymer recycling via different routes and industrial schemes are detailed, covering all current techniques, including regrinding, rebinding, adhesive pressing and compression moulding of recovered PU materials that are then compared with depolymerization approaches. The book examines life cycle assessment and cost analysis associated with polyurethane foams waste management, showing the potential of various techniques. This book will help academics and researchers identify and improve on current depolymerization processes, and it will help industry sustainability professionals choose the appropriate approach for their own waste management systems, thus minimizing the costs and environmental impact of their PU-based end products. - Offers a comprehensive review of all polyurethane foam recycling processes, including both chemical and mechanical approaches - Assesses the potential of each recycling process - Helps industry-based practitioners decide which approach to take to minimize the cost and environmental impact of their end product - Enables academics and researchers to identify and improve upon current processes of degradation and depolymerization
Author: Krzysztof Pielichowski
Publisher: Woodhead Publishing
ISBN: 0128140658
Category : Technology & Engineering
Languages : en
Pages : 513
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Book Description
Polymer Composites with Functional Nanoparticles: Synthesis, Properties, and Applications reviews the latest research in the area of polymer nanocomposites and functionalized nanoparticles, providing an introduction for those new to the field, and supporting further research and development. The book helps researchers and practitioners better understand the key role of nanoparticle functionalization for improving the compatibility of inorganic metallic nanomaterials with organic polymers, and for the fabrication of nanostructured materials with special properties. A range of nanoparticles, such as carbon nanotubes are covered, along with descriptions of the methods of functionalization to support better compatibility with polymer matrices. The book also discusses the various applications of this technology, including uses in electronics and the medical and energy industries. - Summarizes the latest research in functionalized nanoparticles for modification of polymer matrices, providing a valuable platform for further research - Includes functionalization of a range of nanoparticles for incorporation into nanocomposites, including carbon nanotubes, graphene, gold and silver, silica and clay - Provides detailed coverage of application areas, including energy, electronics, biomedical applications, and end-of-life considerations
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :
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