Structure and tensile properties

Structure and Tensile Properties of CNTs/ Polymer Composites... 

THE STRUCTURE AND TENSILE PROPERTIES OF COLD DRAWN MODIFIED CHALK FILLED POLYPROPYLENE... 

Baji A., Mai Y. W., Wong S. C., Abtahi M., and Chen R, Eiectrospinning of polymer nanofibers effects on oriented morphoiogy, structures and tensile properties. Compos. Sci. Technol, 2010,70,703-718. 

Baji, A., Mai, Y.W., Wong, S.C., Abtahi, M. and Chen, P. 2010. Electrospinning of polymer nanofibers Effects on oriented morphology, structures and tensile properties. Composites ScL Technol. 70 703-718. 

Fuller M, Mao N and Taylor M (2013),The internal structure and tensile properties of goose and duck down feathers. Proceedings of 12th Asian Textile Conference (ATC-12), Shanghai, China, 23-26 October 2013. 

Structural Factors and Tensile Properties of Ethylene-Propylene—Diene Terpolymers Prepared with Various Catalyst Systems... 

The analytical techniques discussed previously can be used to study the EPDM network as such or its formation in time as well as to determine relationships between the network structure and the properties of the vulcanisates. In a preliminary approach some typical vulcanised EPDM properties, i.e., hardness, tensile strength, elongation at break and tear strength, have been plotted as a function of chemical crosslink density (Figure 6.6). The latter is either determined directly via 1H NMR relaxation time measurements or calculated from the FT-Raman ENB conversion (Table 6.3). It is concluded that for these unfilled, sulfur-vulcanised, amorphous EPDM, the chemical crosslink density is the main parameter determining the vulcanisate properties. It is beyond the purpose of this review to discuss these relationships in a more detailed and theoretical way. 

The microphase structure and mechanical properties of the blends containing neat acrylonitrile-butadiene-styrene copolymer (ABS), styrene-acrylonitrile copolymer (SAN) and sodium sulfonated SAN ionomer have been investigated as a function of ion content of the ionomer in the blend by Park et a/.51 The interfacial adhesion was quantified by H NMR solid echo experiments. The amount of interphase for the blend containing the SAN ionomer with low ion content (3.1 mol%) was nearly the same as that of ABS, but it decreases with the ion content of the ionomer for the blend with an ion content greater than 3.1 mol%. Changing the ionomer content in the blends shows a positive deviation from the rule of mixtures in tensile properties of the blends containing the SAN ionomer with low ion content. This seems to result from the enhanced tensile properties of the SAN ionomer, interfacial adhesion between the rubber and matrix, and the stress concentration effect of the secondary particles. 

Stoy and co-workers (2) reported an approach that used alternative materials and involved the partial hydrolysis of poly(acrylonitrile) to form a complex structure that was presumed to involve sequences of unhydrolyzed poly(acrylonitrile) interspersed with acrylamide and acrylic acid sequences that resulted from hydrolyzed nitrile groups. Crystallites of unhydrolyzed poly(acrylonitrile) provided the physical cross-link domains within a matrix of the water-swellable portions of the structure. The tensile properties for such materials were considerably enhanced in comparison to the conventional covalently cross-linked hydrogels, and the absence of cross-links allowed processing under certain conditions. 

The triangle shown In Figure 2 shows the Interrelation between the process, the structure of the resulting product, and physical properties. In a modeling situation, one generally starts with a knowledge of the process conditions from which It Is desired to determine structural and physical properties. A study(2) of spinning Poly(ethylene terephthalate) (PET) will be discussed where It was possible to use a model to calculate the stress at the solidification point, and then relate this to spun yarn tensile properties. 

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