Download or read book Formation of In situ Sequential Interpenetrating Polymer Networks Via Thermal and Radiation Curing written by Urmish P. Dalal and published by . This book was released on 1999 with total page 310 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Independent and Interconnected Interpenetrating Polymer Network Formation In Dual Cure Thermoset Resins written by Jessica Kopatz and published by . This book was released on 2021 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Thermoset polymers are of interest for many structural applications due to their mechanical, thermal, and chemical resiliency in comparison to thermoplastic polymers. However, utilizing thermosets in the realm of additive manufacturing is still a developing field, especially when using viscous thermosets where long cure times can limit the shape retention of 3D printed parts. There has been increased interest in the development of direct-ink-write (DIW) methods for thermoset resins in the last several years. The approaches generally fall into two categories; dual-cure systems or filled resins. Dual-cure resins are comprised of multiple thermoset polymers that are cured using different stimuli or variations of the same stimuli (i.e. temperatures, wavelengths, etc.). Common dual-cure thermoset resins consist of a photo-curable acrylate and a thermally-curable epoxy. For sequential dual-cure systems, the photo-cure mechanism can be rapidly completed immediately after extrusion from the print tip in order to lock-in the desired structure, while the sequential thermal cure forms the epoxy network and enhances the composite properties. Sequential curing of the resin, via UV exposure followed by thermal exposure, creates interpenetrating polymer networks (IPNs), which can enhance the overall thermomechanical properties compared to either parent material. IPNs consist of two or more networks that are interwoven on a molecular scale. Though the networks are not covalently bound to each other, they cannot be separated unless chemical bonds are broken. Independent IPNs exist where there are two separate but interwoven networks, while interconnected IPNs form by the addition of a heterobifunctional monomer that links the two networks together. Interconnected IPNs are expected to result in the best properties due to the tethering of the two otherwise separate networks. The filled resins approach to the DIW of thermosets generally require the material to possess high zero-shear viscosity, shear thinning behavior, and controlled curing. High zero-shear viscosity permits shape retention post-extrusion, while shear thinning enables the fluid to flow easily through the print head. To enable shear thinning, fillers such as clay or silica are added, where the filler is usually modified to enable better dispersion within the polymer matrix. Not only does the addition of inorganic fillers alter the rheology and printability of the resin, the fillers can also impact the thermomechanical properties of the composite. This thesis describes the influence of resin composition on the printability and 'green strength' of printed parts. After the sequential thermal cure in the dual-cure system, the impact of acrylate network formation on the evolution and formation of independent IPNs was investigated. Moving to a more simplified dual-cure acrylate-epoxy resin system, the impact of acrylate-functionalized and epoxy-functionalized filler particles as network crosslinkers was explored. Finally, the influence of heterobifunctional acrylate-epoxy hybrid monomers with differing backbones on the formation of interconnected IPNs was investigated.

Download or read book A Study of Sequential Interpenetrating Polymer Networks Based on Polydimethylsiloxane written by Brian McGarey and published by . This book was released on 1987 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book A Study of Sequential Interpenetrating Polymer Networks Based on Polymethylsiloxane written by B. McGarey and published by . This book was released on 1987 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Bismaleimide and Cyanate Ester Based Sequential Interpenetrating Polymer Networks for High Temperature Application written by Xing Geng and published by . This book was released on 2005 with total page 500 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Sequential Interpenetrating Polymer Networks of Epoxidised Natural Rubber and Alkyl Methacrylates written by Ahmad Marzio Mohd Yusof and published by . This book was released on 1999 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Advanced Polymers Abstracts written by and published by . This book was released on 1996 with total page 736 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Chemical Abstracts written by and published by . This book was released on 2002 with total page 2018 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Interpenetrating Polymer Networks written by Daniel Klempner and published by . This book was released on 1994 with total page 664 pages. Available in PDF, EPUB and Kindle. Book excerpt: Provides a comprehensive review of interpenetrating polymer networks. Opens with four review chapters by important workers in the field--Sperling, Klempner, Utracki, and Lipatov- and continues with an international penetration of current research. Covers synthesis and structure, miscibility and morphology, structure-property relationships, transport and permeability, and functionalized triglyceride oils.

Download or read book Engineered Materials Abstracts written by and published by . This book was released on 1995 with total page 688 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Compendium of Polymer Terminology and Nomenclature written by Richard G Jones and published by Royal Society of Chemistry. This book was released on 2009-01-19 with total page 465 pages. Available in PDF, EPUB and Kindle. Book excerpt: The IUPAC system of polymer nomenclature has aided the generation of unambiguous names that re ect the historical development of chemistry. However, the explosion in the circulation of information and the globalization of human activities mean that it is now necessary to have a common language for use in legal situations, patents, export-import regulations, and environmental health and safety information. Rather than recommending a ‘unique name’ for each structure, rules have been developed for assigning ‘preferred IUPAC names’, while continuing to allow alternatives in order to preserve the diversity and adaptability of nomenclature. Compendium of Polymer Terminology and Nomenclature is the only publication to collect the most important work on this subject into a single volume. It serves as a handy compendium for scientists and removes the need for time consuming literature searches. One of a series issued by the International Union of Pure and Applied Chemistry (IUPAC), it covers the terminology used in many and varied aspects of polymer science as well as the nomenclature of several di erent types of polymer including regular and irregular single-strand organic polymers, copolymers and regular double-strand (ladder and spiro) organic polymers.

Download or read book Phase Separated Interpenetrating Polymer Networks written by Yuri S. Lipatov and published by Springer Science & Business Media. This book was released on 2007-09-26 with total page 243 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Interpenetrating Polymer Network Biomedical Applications written by Sougata Jana and published by Springer Nature. This book was released on 2020-02-18 with total page 344 pages. Available in PDF, EPUB and Kindle. Book excerpt: The book focuses on novel interpenetrating polymer network (IPN)/semi-IPN technologies for drug delivery and biomedical applications. The dynamism of the design and development of interpenetrating network polymers is based on their ability to provide free volume for the easy encapsulation of drugs in the three-dimensional network structure obtained by cross-linking two or more polymer networks. Natural polymer-based IPNs can deliver drugs at a controlled rate over an extended period of time, while novel IPNs ensure better mechanical strength and sustained/ controlled drug-delivery properties. This book presents an overview of the use of this technology to fabricate nanomedicine, hydrogels, nanoparticles, and microparticles, thereby unlocking IPN’s potential in the area of drug delivery and biomedical engineering. It also discusses applications of IPN systems in cancer therapy and tissue engineering, and describes the various IPN systems and their wide usage and applications in drug delivery.

Download or read book International Aerospace Abstracts written by and published by . This book was released on 1999 with total page 1032 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Cellulose Based Superabsorbent Hydrogels written by Md. Ibrahim H. Mondal and published by Springer. This book was released on 2019-02-22 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: With the prospect of revolutionizing specific technologies, this book highlights the most exciting and impactful current research in the fields of cellulose-based superabsorbent hydrogels with their smart applications. The book assembles the newest synthetic routes, characterization methods, and applications in the emergent area. Leading experts in the field have contributed chapters representative of their most recent research results, shedding light on the enormous potential of this field and thoroughly presenting cellulose-based hydrogel functioning materials. The book is intended for the polymer chemists, academic and industrial scientists and engineers, pharmaceutical and biomedical scientists and agricultural engineers engaged in research and development on absorbency, absorbent products and superabsorbent hydrogels. It can also be supportive for undergraduate and graduate students.

Download or read book Polysaccharide Hydrogels written by Pietro Matricardi and published by CRC Press. This book was released on 2016-01-05 with total page 527 pages. Available in PDF, EPUB and Kindle. Book excerpt: Hydrogels are an emerging area of interest in medicine as well as pharmaceutics, and their physico-chemical characterization is fundamental to their practical applications. Compared with synthetic polymers, polysaccharides that are widely present in living organisms and come from renewable sources are extremely advantageous for hydrogel formation.

Download or read book Polymer Science and Engineering written by National Research Council and published by National Academies Press. This book was released on 1994-01-01 with total page 193 pages. Available in PDF, EPUB and Kindle. Book excerpt: Polymers are used in everything from nylon stockings to commercial aircraft to artificial heart valves, and they have a key role in addressing international competitiveness and other national issues. Polymer Science and Engineering explores the universe of polymers, describing their properties and wide-ranging potential, and presents the state of the science, with a hard look at downward trends in research support. Leading experts offer findings, recommendations, and research directions. Lively vignettes provide snapshots of polymers in everyday applications. The volume includes an overview of the use of polymers in such fields as medicine and biotechnology, information and communication, housing and construction, energy and transportation, national defense, and environmental protection. The committee looks at the various classes of polymersâ€"plastics, fibers, composites, and other materials, as well as polymers used as membranes and coatingsâ€"and how their composition and specific methods of processing result in unparalleled usefulness. The reader can also learn the science behind the technology, including efforts to model polymer synthesis after nature's methods, and breakthroughs in characterizing polymer properties needed for twenty-first-century applications. This informative volume will be important to chemists, engineers, materials scientists, researchers, industrialists, and policymakers interested in the role of polymers, as well as to science and engineering educators and students.