The effect of deformation temperature on the structure of crazes in isotactic polypropylene

Yefimov, A.V.; Bulayev, V.M.; Ozerin, А. N.; Ребров, А. В.; Godovskii, Yu.K.; Bakeyev, N.F.

doi:10.1016/0032-3950(86)90293-5

Cited by 1 publication

(2 citation statements)

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“…These precursors were produced by stretching in air, which produces necking, followed by annealing in the free-standing state at 160 °C for 30 min. 23 Upon such annealing, the samples shrunk, reducing their dimensions along the length by about 52−55%. Figure 1 illustrates that subsequent stretching in air of such PP substrates is accompanied by development of marked porosity, evidenced by the formation of light-scattering irregularities and "milky" color of the stretched PP film.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

“…HEPP precursors/substrates in the form of a 105 μm thick tape were produced from a conventional blown PP film (Tver Khimvolokno, Russia; thickness 200 μm; M w = 3 × 10 5 ) as follows: 2 cm wide pieces of PP film tape were uniaxially stretched in air at room temperature by 500% with respect to their original length. The necked part of the resulting tape was then cut out, placed in a dry oven, and allowed to relax in a free state at 160 °C for 30 min (annealing 23 ). During such thermal treatment, the stretched tape shrunk by ∼52−55% and converted into HEPP.…”

Section: ■ Experimental Sectionmentioning

confidence: 99%

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Phosphorescent Oxygen and Mechanosensitive Nanostructured Materials Based on Hard Elastic Polypropylene Films

Okkelman

Долгова

Banerjee

et al. 2017

ACS Appl. Mater. Interfaces

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It is well known that sensitivity of quenched-phosphorescence O sensors can be tuned by changing the nature of indicator dye and host polymer acting as encapsulation and quenching mediums. Here, we describe a new type of sensor materials based on nanostructured hard elastic polymeric substrates. With the example of hard elastic polypropylene films impregnated with Pt-benzoporphyrin dye, we show that such substrates enable simple one-step fabrication of O sensors by standard and scalable polymer processing technologies. In addition, the resulting sensor materials show prominent response to tensile drawing via changes in phosphorescence intensity and lifetime and O quenching constant, K. The mechanosensitive response shows reversibility and hysteresis, which are related to macroscopic changes in the nanoporous structure of the polymer. Such multifunctional materials can find use as mechanically tunable O sensors, as well as strain/deformation sensors operating in a phosphorescence-lifetime-based detection mode.

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Section: ■ Results and Discussionmentioning

confidence: 99%

Section: ■ Experimental Sectionmentioning

confidence: 99%