Orientation Efforts as Regulatory Factor of Structure Formation in Permeable Porous Poly(vinylidene fluoride) Films

Elyashevich, G. K.; Kuryndin, I. S.; Dmitriev, I. Yu.; Lavrentyev, V. K.; Сапрыкина, Н. Н.; Bukošek, V.

doi:10.1007/s10118-019-2284-2

Cited by 10 publications

(13 citation statements)

References 32 publications

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“…PVDF porous films were prepared in five stages: melt extrusion, isometric annealing of extruded films at the temperature close to polymer melting point (170°C), two stages of uniaxial extension-a "cold" stage at room temperature and "hot" stage at 100°C (pore formation stages), and thermal fixation of porous structure at 100°C. Polymer Kynar-720 (Atofina Chemicals Inc., USA), M w = 1.9 × 10 5 , was used for in the preparation process (Elyashevich et al 2019).…”

Section: Experimental Methodsmentioning

confidence: 99%

“…The obtained porous films vary in porosity and size of pores due to the parameter-controlled preparation process (Table 1). The porous films are marked by a strongly developed relief-like surface (Elyashevich et al 2019). It is the result of stress release to the surface which leads to the development of through pores.…”

Section: Characteristics Of Pvdf Supportsmentioning

confidence: 99%

“…During the preparation of porous PVDF films the β-crystals are formed during uniaxial extension as a result of a polymorphous α -β transition. It was shown in (Elyashevich et al 2019) that the content of β-phase increases at growth of orientation degrees (ε 1 and ε 2 ) at uniaxial extension stages. At the same time, it was observed that an increase in orientation at the extrusion stage (λ) leads to a decrease in β-form content formed at the subsequent α -β transformation under uniaxial deformation.…”

Section: Conductivity and Piezoelectric Properties Of Pvdf/conductingmentioning

confidence: 99%

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Piezo-active composite systems based on porous polyvinylidene fluoride films and conducting polymer layers as electrodes

Elyashevich

Kuryndin

Rosova

et al. 2021

Physics of Complex Systems

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The study has obtained composite systems containing porous polyvinylidene fluoride films and electroconducting polymers-polyaniline and polypyrrole. Porous supports were prepared by melt extrusion. It was shown by scanning electron and atomic force microscopy that porous PVDF films have a relief surface, and a higher surface roughness improves hydrophilicity of supports. The layers of conducting polymers on the surface of porous supports were formed by oxidative polymerization in situ in monomer solution. It was found that conducting coatings have high adhesion of conducting layers to the porous films due to the relief surface of the PVDF film. Composites have surface and volume conductivity on the order of 10 1 S/cm and 10 -6 -10 -5 S/cm, respectively. The layers of conducting polymers were used as electrodes to polarize the composites and to measure piezomodulus d 31 . The maximum value of d 31 was 18 pC/N.

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Section: Experimental Methodsmentioning

confidence: 99%

Section: Characteristics Of Pvdf Supportsmentioning

confidence: 99%

Section: Conductivity and Piezoelectric Properties Of Pvdf/conductingmentioning

confidence: 99%

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Piezo-active composite systems based on porous polyvinylidene fluoride films and conducting polymer layers as electrodes

Elyashevich

Kuryndin

Rosova

et al. 2021

Physics of Complex Systems

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“…Существенным затруднением при получении пьезоэлементов на основе ПВДФ с токопроводящими электродными слоями является низкая адгезия " гладких" пленок к электродным материалам, включая большинство полимерных и низкомолекулярных покрытий. В данной работе для получения пьезоэлементов использовали пористые пленки ПВДФ, сформованные методом, основанным на экструзии расплава полимера с последующими стадиями отжига, одноосного растяжения и термофиксации [9][10][11]. Пористая структура этих пленок характеризуется наличием сквозных каналов, которые образуются по перколяционному механизму на стадии порообразования в процессе роста общей пористости и достижении ею значений, соответствующих порогу перколяции (23−25%) [11,12].…”

Section: Introductionunclassified

“…В данной работе для получения пьезоэлементов использовали пористые пленки ПВДФ, сформованные методом, основанным на экструзии расплава полимера с последующими стадиями отжига, одноосного растяжения и термофиксации [9][10][11]. Пористая структура этих пленок характеризуется наличием сквозных каналов, которые образуются по перколяционному механизму на стадии порообразования в процессе роста общей пористости и достижении ею значений, соответствующих порогу перколяции (23−25%) [11,12]. Особенностью этих пленок является рельефный характер их поверхности, который формируется вследствие " выброса"напряжения при образовании в пленках сквозных пор.…”

Section: Introductionunclassified

Полимерные Пьезоэлементы На Основе Пористых Пленок Поливинилиденфторида И Контактных Электродных Слоев Полианилина

Ельяшевич¹,

Курындин²,

Розова³

et al. 2020

Физика Твердого Тела

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The preparation method to obtain the new hybrid piezoactive systems by successive layer-by-layer aniline polymerization in situ on the porous polyvinylidene fluoride films formed in the process based on melt extrusion has been elaborated. It is established by IR spectroscopy that the conducting form of polyaniline (emerald salt) is synthesized. It is proved that the samples containing two layers of polyaniline are characterized by higher electroconductivity than the single-layer ones, and its value increases with the orientation degree of the support. It is confirmed by electron microscopy that this effect is due to the higher homogeneity and ordering of the conducting layer in more oriented samples. It is shown that hybrid samples have a higher breaking strength, elastic modulus and break elongation than support. Electro- and piezoactive properties of the hybrid systems were studied by cyclic voltampermetry and piezomodulus testing using polyaniline layers as contact electrode materials. Piezoconstants of the samples were measured depending on the direction of loading.

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Structure transformations and dielectric properties of extruded and annealed polyvinylidene fluoride films

Gerasimov,

Kuryndin,

Lavrentyev

et al. 2023

Iran Polym J

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Orientation Efforts as Regulatory Factor of Structure Formation in Permeable Porous Poly(vinylidene fluoride) Films

Cited by 10 publications

References 32 publications

Piezo-active composite systems based on porous polyvinylidene fluoride films and conducting polymer layers as electrodes

Piezo-active composite systems based on porous polyvinylidene fluoride films and conducting polymer layers as electrodes

Полимерные Пьезоэлементы На Основе Пористых Пленок Поливинилиденфторида И Контактных Электродных Слоев Полианилина

Structure transformations and dielectric properties of extruded and annealed polyvinylidene fluoride films

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