Effect of crystallization on the mechanical properties of cellulose triacetate and acetosorbates

Akhmedov, F. A.; Aikhodzhaev, B. I.; Talipov, G. Sh.; Surovkin, V. M.

doi:10.1007/bf00855789

Cited by 2 publications

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“…It is known that Young's modulus decreases with increasing crystallization,21 and it is also known that the amount of crystallization increases with time in the transition temperature range 20. Thus, the observed rate dependence of the apparent Young's modulus is explained by different degrees of crystallization.…”

Section: Resultsmentioning

confidence: 99%

Shrinkage behavior of poly(ethylene terephthalate) for a new cementitious–shrinkable polymer material system

Dunn

Jefferson

Lark

et al. 2010

J of Applied Polymer Sci

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An investigation of the transient thermomechanical behavior of poly(ethylene terephthalate) (PET) is presented with respect to a new composite material system in which shrinkable PET tendons are incorporated into a cementitious matrix to provide a crack-closure mechanism. A series of parametric studies of the effects of the geometry, temperature, and soak time on the mechanical properties of the polymer are presented. In particular, this article focuses on the shrinkage behavior and the development of stresses under restrained shrinkage conditions. A one-dimensional numerical model, which is essentially a modification of Zener's standard linear solid model, is presented with the aim of simulating aspects of behavior of particular relevance to tendons within the composite material system. The model comprises a temperature-dependent dashpot and spring in parallel with a spring and thermal expansion element. The temperature-dependent functions are calibrated with the obtained data, and a final validation example that shows good accuracy in comparison with experimental data not used for the calibration is presented.

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Section: Resultsmentioning

confidence: 99%

Shrinkage behavior of poly(ethylene terephthalate) for a new cementitious–shrinkable polymer material system

Dunn

Jefferson

Lark

et al. 2010

J of Applied Polymer Sci

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show abstract

“…Whereas, the Young's moduli (E), given by the slope of the stress-strain curve in the elastic region, were found to be 1.90 and 1.85 GPa for lms #1 and #2, respectively. Taking into account that for a pristine (non-covered) polycarbonate lm such parameters are s yield ¼ 1.4% and E ¼ 2.05 GPa, 11 and for a cellulose triacetate lm the Young's modulus is E ¼ 2.06 GPa, 35 the covering of polycarbonate and cellulose triacetate lms with a layer of (TTF)I 0.7+d crystals does not adversely affect their mechanical characteristics. Fig.…”

Section: Structure Of Bilayer Polymeric Lms With (Ttf)i 07+d Crystalsmentioning

confidence: 99%

A new (TTF)₁₁I₈organic molecular conductor: from single crystals to flexible all-organic piezoresistive films

et al. 2014

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This paper reports selective synthesis of two iodine-containing TTF (tetrathiafulvalene) salts: one, (TTF) 11 I 8 , is a new molecular conductor while another is the known non-conducting (TTF)I 3 compound. Single crystals of both salts were prepared using different amounts of iodine in the redox process between TTF and I 2 . X-ray data showed that the resulting conducting (TTF) 11 I 8 salt might be considered as a new modulated phase of the non-stoichiometric (TTF)I 0.7+d salts. The electrical resistance of single crystals of (TTF) 11 I 8 reveals a semiconducting-like behaviour. The paper presents also a study of electromechanical properties of organic conductive bi-layer (BL) films prepared by covering different organic polymeric films with a thin network of oriented submicrocrystals of (TTF)I 0.7+d phases. These BL films exhibit a combination of flexibility, lightweight, and high piezo-resistivity properties showing therefore a potential interest for electronic sensing applications where lightweight, large area coverage and flexibility are required.

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Effect of crystallization on the mechanical properties of cellulose triacetate and acetosorbates

Cited by 2 publications

References 0 publications

Shrinkage behavior of poly(ethylene terephthalate) for a new cementitious–shrinkable polymer material system

Shrinkage behavior of poly(ethylene terephthalate) for a new cementitious–shrinkable polymer material system

A new (TTF)₁₁I₈organic molecular conductor: from single crystals to flexible all-organic piezoresistive films

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Effect of crystallization on the mechanical properties of cellulose triacetate and acetosorbates

Cited by 2 publications

References 0 publications

Shrinkage behavior of poly(ethylene terephthalate) for a new cementitious–shrinkable polymer material system

Shrinkage behavior of poly(ethylene terephthalate) for a new cementitious–shrinkable polymer material system

A new (TTF)11I8organic molecular conductor: from single crystals to flexible all-organic piezoresistive films

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A new (TTF)₁₁I₈organic molecular conductor: from single crystals to flexible all-organic piezoresistive films