scispace - formally typeset
Search or ask a question
Book

Mechanical Properties of Polymers and Composites

TL;DR: In this article, the authors discuss various mechanical properties of fiber-filled composites, such as elastic moduli, creep and stress relaxation, and other mechanical properties such as stress-strain behavior and strength.
Abstract: Mechanical Tests and Polymer Transitions * Elastic Moduli * Creep and Stress Relaxation * Dynamical Mechanical Properties * Stress-Strain Behaviour and Strength * Other mechanical Properties * Particulate-Filled Polymers * Fiber- Filled Composites and Other Composites.
Citations
More filters
Journal ArticleDOI
TL;DR: In this article, the authors investigated the nanoindentation creep behavior of several different polymers in terms of the Chudoba and Richter equation, where the extent of creep e is represented by the extent e = ee ln(ert + 1),w heret is the loading time and ee and er are material constants.
Abstract: The nanoindentation creep behaviour of several different polymers has been investigated. The extent of creep e is represented by the Chudoba and Richter equation: e = ee ln(ert + 1) ,w heret is the loading time and ee and er are material constants. Creep was determined in this way for a variety of polymers at Texper = 301.7K.Some of the materials studied were far above, some far below and some near their glass transition temperatures Tg .T he creep rate er was plotted as a function of y = (Tg − Texper); a single curve was obtained in spite of a large variety of chemical structures of the polymers. The er = er(y) diagram can be divided into three regions according to the chain mobility. At large negative y values, the creep rate is high due to the liquid-like behaviour. At large positive y values in the glassy region, the creep rate is higher than that in the negative y-value region; the creep mechanism is assigned to material brittleness and crack propagation. In the middle y range there is a minimum of er .T hese results can be related to glassy and liquid structures represented by Voronoi polyhedra and Delaunay simplices. The latter form clusters; in the glassy material there is a percolative Delaunay cluster of nearly tetrahedral high- density configurations. The creep mechanism here is related to crack propagation in brittle solids. In the liquid state there is a different percolative Delaunay cluster formed by low-density configurations, which, as expected, favour high creep rates.  2007 Society of Chemical Industry

43 citations

Journal ArticleDOI
TL;DR: In this article, polystyrene/layered double hydroxides (PS/LDHs) nanocomposites were prepared by free radical polymerization of styrene monomer in the presence of LDHs intercalated with 4,4′-azobis(4-cyanopentanoate) anions (LDH-ACPA).

43 citations


Cites background from "Mechanical Properties of Polymers a..."

  • ...density of packing of the polymer chains, and modifies the conformation and orientation of chain segments in the neighborhood of the surface[15]....

    [...]

Journal ArticleDOI
TL;DR: This review brings together models and design principles that enable key applications of PRHs in tissue engineering, drug delivery, and soft robotics, and highlights ongoing challenges in both modeling and application.
Abstract: Photoresponsive hydrogels (PRHs) are soft materials whose mechanical and chemical properties can be tuned spatially and temporally with relative ease Both photo-crosslinkable and photodegradable hydrogels find utility in a range of biomedical applications that require tissue-like properties or programmable responses Progress in engineering with PRHs is facilitated by the development of theoretical tools that enable optimization of their photochemistry, polymer matrices, nanofillers, and architecture This review brings together models and design principles that enable key applications of PRHs in tissue engineering, drug delivery, and soft robotics, and highlights ongoing challenges in both modeling and application

43 citations

Journal ArticleDOI
TL;DR: GO/SEBS and rGO/ SEBS composites can represent a new generation of materials for strain sensor applications, as demonstrated in their implementation in a hand-glove prototype with finger movement monitoring.
Abstract: This work was supported by the Portuguese Foundation for Science and Technology (FCT) under Strategic Funding UID/FIS/04650/2019 and UID/CTM/50025/2019, UID/CTM/50025/2013 and projects PTDC/EEI-SII/5582/2014, and EuroNanoMed 2016 call, Project LungChek ENMed/0049/2016. P.C. and S.G. also thank the FCT for the, SFRH/BPD/110914/2015 and SFRH/BD/110622/2015 grants, respectively. The authors acknowledge funding by the Spanish Ministry of Economy and Competitiveness (MINECO) through the project MAT2016-76039-C4-3-R. Financial support from the Basque Government Industry and Education Departments under ELKARTEK, HAZITEK and PIBA (PIBA-2018- 06) programs, respectively, is also acknowledged. SACC thanks Fundacao para a Ciencia e Tecnologia (FCT) for financial support through Investigador FCT program (IF/01381/2013/CP1160/CT0007), with financing from the European Social Fund and the Human Potential Operational Program. This work was financially supported by Project POCI-01-0145-FEDER-006984–Associate Laboratory LSRELCM funded by FEDER through COMPETE2020–Programa Operacional Competitividade e Internacionalizacao (POCI) – and by national funds through FCT. Authors are also thankful to Dr. Carlos M. Sa (CEMUP) for assistance with XPS analyses.

43 citations

Journal ArticleDOI
21 Jan 2010-Polymer
TL;DR: In this article, the effect of two different reinforcements, clay at the nanoscale and glass fibres at the micro-scale, on the mechanical properties of PA/clay and GF/PA/Clay are studied.

43 citations