Poly uniaxially stretched

Y. Zhao, B. Jasse, and L. Monnerie, Orientation and relaxation in uniaxially stretched poly(methyl methacrylate)-poly(ethylene oxide) blends, Polymer, 30, 1643 (1989). 

By contrast, the ECP must have conjugated rigid-rod macromolecules. Several such polymers show high electrical conductivity (usually after doping), viz. polyacetylene (PAc), polyaniline (PANI), polypyrrole (PPy), polyparaphenylenes (PPP), or poly-3-octyl thiophene (POT). The resins are expensive, difficult to process, brittle and affected by ambient moisture, thus blending is desirable. For uniaxially stretched fibers the percolation threshold is 1.8 vol%, hence low concentration of ECP (usually 5-6 vol%) provides sufficient phase co-continuity to ascertain conductivity similar to that of copper wires (see Table 1.79). 

Batra, A. Hedden, R. C. Schofield, P. Barnes, A. Cohen, C. Duncan, T. M., Conformational Behavior of Guest Chains in Uniaxially Stretched Poly(diethylsiloxane) Elastomers NMR and SANS. Macromolecules 2003, 36, 9458-9466. 

J. Mulligan and M. Cakmak, Nonlinear mechanooptieal behavior of uniaxially stretched poly(lactic acid) dynamic phase behavior. Macromolecules, 38, 2333 (2005). 

Infrared dichroic spectra were measured for a uniaxially stretched film of poly(3-hexylthiophene)... 

Gestoso, P. and Brisson, J. (2001) Orientation of uniaxially stretched poly (vinyl phenol)/poly(vinyl methyl ether) blends. Polymer, 42, 8415-8424. 

M. Ihmura, E Ogasawara, N. Ono, and S. Hagisrara. Piezoelectridiy in uniaxially stretched poly(v nytidenc fluorideX / ApfA. Pkys. 45 3768 (1974X... 

Kawakami, D., Burger, C., Ran, S Avila-Orta, C., Sics, 1 Chu, B. et al. (2008) New insights into lamellar structure development and SAXS/WAXD sequence appearance during uniaxial stretching of amorphous poly(ethylene terephthalate) above glass transition temperature. Macromolecules, 41,2859-2867. 

K. (2005) SmaH-angle neutron scattering study on uniaxially stretched poly(N-... 

Miyazaki, T., Hoshiko, A., Akasaka, M., Shintani, T., Sakurai, S. SAXS studies on structural changes in a poly(vinyl alcohol) film during uniaxial stretching in water. Macromolecules 39, 2921-2929 (2006)... 

This stretching, similar to the drawing of fibres, which promotes orientation and crystallite formation, is called biaxial orientation. It gives the film added strength and gas-barrier properties. In some processes, monoaxial (uniaxial) drawing is employed, e.g., polypropylene, which is then slit into thin strips and fabricated into heavy duty sacks, carpet backing, etc. The stenter process is used to make biaxial oriented poly(vinylidene dichloride) ("ding" film), polyester, polyamide and polypropylene films. 

Yalcin B and Cakmak M (2005) Molecular orientation behavior of poly(vinyl chloride) as influenced by the nanoparticles and plasticizer during uniaxial film stretching in the rubbery stage, J Polym Sci Polym Phys 43 724-742. 

Uniaxial tensile tests of poly (ethylene terephthalate) (PET)/montmorillonite(MMT) nanocomposites were preformed over a temperature range of 85°C-105°C and stretch rate of 7.5mm/s-12.5mm/s. The stress-strain curves consisted of three regions the hnear visoelasticity, the rubbery plateau and the strain hardening. The effects of temperature and stretch rate on stress-strain behavior were discussed. The results of differential scanning calorimetry (DSC) measurements indicated that the stretch lead the increase of the crystallinity degree of specimens. The wide angle X-ray diffraction (WAXD) measurements revealed that the more perfect crystal structures were obtained with the increase of temperature and oriented along the stretch direction. 

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