Cold drawing of it-polypropylene films of different thicknesses

Springer, H.; Schenk, Wolfdieter A.; Hinrichsen, G.

doi:10.1007/bf01411512

Cited by 10 publications

(6 citation statements)

References 13 publications

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“…The dependencies of E , ultimate tensile strength (σ b ), and elongation at break (ϵ b ) on temperature and V e were similar to the dependencies represented in refs. 13 and14.…”

Section: Resultsmentioning

confidence: 99%

Polynitroethyl‐ and Fluorodinitroethyl Substituted Boron Esters

Klapötke

Krumm

Moll

2013

Chemistry A European J

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The reaction of boron oxide with various nitro-substituted ethanols (2-nitroethanol, 2-fluoro-2,2-dinitroethanol, 2,2,2-trinitroethanol) furnished the corresponding nitroethyl borates B(OCH2CH2NO2)3 (1), B(OCH2CF(NO2)2)3 (2), and B(OCH2C(NO2)3)3 (3). Fluorination of the anion [(NO2)2CCH2OH](-) (4) resulted in 2-fluoro-2,2-dinitroethanol (5), a precursor for 2, and was thoroughly characterized. An interesting condensation was observed with the anion 4 to form the unusual dianion [(NO2)2CCH2C(NO2)2](2-) (6). All compounds were fully characterized by multinuclear NMR spectroscopy, vibrational spectroscopy (IR, Raman), mass spectrometry and elemental analysis. The chemical, physical and energetic properties of 1-3 and 5 are reported, as well as quantum chemical calculations at the CBS-4M level of theory to predict the enthalpies and energies of formation. X-ray diffraction studies were performed, and the crystal structures for compounds 1-6 were determined and discussed thoroughly. The boron esters 1-3 are of interest as possible candidates for smoke-free, green colorants in pyrotechnic applications, and in case of 2 and 3 also as promising high energy oxidizers.

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“…The dependencies of E , ultimate tensile strength (σ b ), and elongation at break (ϵ b ) on temperature and V e were similar to the dependencies represented in refs. 13 and14.…”

Section: Resultsmentioning

confidence: 99%

Polynitroethyl‐ and Fluorodinitroethyl Substituted Boron Esters

Klapötke

Krumm

Moll

2013

Chemistry A European J

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“…The relatively small size of the deforming volume will result in a rapid heat transfer to the surrounding material and air. This size effect has been ascribed to the increase in surface to volume ratio as the deforming volume becomes smaller, for plastically deforming polypropylene 7…”

Section: Resultsmentioning

confidence: 99%

Thermal gradient solid state forming of polypropylene

Shinozaki

2007

J of Applied Polymer Sci

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ABSTRACT:The near surface region of polypropylene was hardened in a forming process, which involved a large shear strain in a strong thermal gradient. The optimal processing conditions were estimated by modeling the temperature distribution in the deformation zone. Microindentation testing was used to characterize the corresponding depth-dependent mechanical properties. The mechanical gradient, which developed after forming, was consistent with the observed variation in microstrucfture.

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“…Indeed the local temperature in the neck shoulder of cold‐drawn iPP at room temperature had been observed to be higher than 50°C in the surface by an IR‐radiation thermometer . This proves that the self‐heating does exist in the plastic deformation of iPP.…”

Section: Discussionmentioning

confidence: 99%

Influence of temperature on the microstructure and mechanical properties of stretched polypropylene

Xiong

Cao

2015

J of Applied Polymer Sci

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Microstructure and mechanical properties of isotactic polypropylene (iPP) stretched at different temperatures were studied. Strain‐induced fibrils were observed after stretching. Crystallinity (Xc), crystallite thickness (Lc), long period (Lpf), and diameter (Df) of fibrils were characterized by Differential Scanning Calorimetry and Small angle X‐ray scattering. Lpf of stretched iPP below 60°C was found to be lower than undrawn iPP. Xc, Lc, and Df increased with increasing draw temperature. Tensile test showed that Young's moduli of stretched iPPs were negatively dependent on Xc and Lc. The fraction of taut tie molecules was estimated from the mechanical model. Results showed that more tie molecules were formed in the samples stretched at lower temperatures. Dynamical mechanical analysis showed that glass transition temperature was strongly dependent on the draw temperature. The glass transition peak disappeared in stretched iPPs obtained below 80°C. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015, 132, 42622.

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Cold drawing of it-polypropylene films of different thicknesses

Cited by 10 publications

References 13 publications

Polynitroethyl‐ and Fluorodinitroethyl Substituted Boron Esters

Polynitroethyl‐ and Fluorodinitroethyl Substituted Boron Esters

Thermal gradient solid state forming of polypropylene

Influence of temperature on the microstructure and mechanical properties of stretched polypropylene

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