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Цебренко, М. В.; Резанова, Н. М.; Tsebrenko, I. A.

doi:10.1023/a:1021045015324

Cited by 6 publications

(11 citation statements)

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“…Значний інтерес до таких структур пов'язаний з тим, що при формуванні композиційних матеріялів досягається ефект самоармування та модифікації поверхні виробів за рахунок направленої міґрації фібрил до їх поверхні [1][2][3][4][5][6]. Êрім того, переробкою розтопів сумішей полімерів одержують мікроволокна з унікальними структурою і властивостями та нові тонковолокнисті матеріяли на їх основі (бавовноподібні синтетичні волокна і нитки, прецизійні фільтрувальні матеріяли, сорбенти тощо) [7,8]. Морфологія несумісних сумішей залежить від багатьох факторів: складу, відносної в'язкости компонентів, величини поверхневого натягу на межі поділу фаз, термодинамічної нестабільности, часу і швидкости змішування, геометрії і розмірів шнеку екструдера.…”

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“…Один із ланцюгів цих співполімерів є частково або повністю сумісним з одним із полімерів суміші, а другий -з іншим. В ряді робіт показано, що компатибілізувальну дію можуть проявляти також і нанодобавки, що сприяє поліпшенню дисперґування компоненту дисперсної фази, підвищенню стабільности дисперсії та волокноутворенню одного полімеру в матриці іншого [2][3][4][5][6][7][8][12][13][14][15]. Нанокомпозитам притаманний комплекс нових унікальних характеристик: висока механічна міцність, стійкість до ультрафіолетового опромінення, відкритого вогню та агресивних середовищ, підвищені тепло-й електропровідність, фотокаталітична та біологічна активність, здатність самоочищатися тощо.…”

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Regularities of Fabrication of Nanofilled Polymeric Materials with Matrix–Fibrillar Structure

2017

Nanosist. Nanomater. Nanotehnol.

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Regularities of Fabrication of Nanofilled Polymeric Materials with Matrix–Fibrillar Structure

2017

Nanosist. Nanomater. Nanotehnol.

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“…In this case, diameter of the microfibrils is largely determined by the rheological characteristics of the components of mixture and the degree of their compatibility at the interphase. Improvement of microfibrillary morphology (reduction of diameters of fibrils and increase of their mass fraction) is achieved by introduction of special substances into the mixture, namely, compatibilizers [14,15], nanoadditives [5][6][7]11] or their compositions [11,16,17].…”

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confidence: 99%

Mathematical Modelling and Software Development to Optimize the Composition of Four-Component Nanofilled Systems

2020

Nanosist. Nanomater. Nanotehnol.

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“…Fibre formation does not take place in the phase change region. However, macro-and microflow processes in melts of polymer blends can be controlled by adding compatibilizers (substances that improve the compatibility of the components of a blend) [2][3][4].We investigated the macro-and microflow processes in compatibilized PP/CPA blends of 50/50 wt. % composition with polyethylene glycol (PEG) additive in the amount of 0.5, 1.0, 3.0, and 5.0% of the weight of the PP.…”

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Specific Fibre Formation in Flow of Melts of Polypropylene/Copolyamide Blends in the Phase Change Region

2005

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541.64:532.135 and N. M. RezanovaThe rheological features and crosslinking processes in melts of PP/CPA [polypropylene/copolyamide] blends containing PEG [polyethylene glycol] or EVAC [ethylene-vinyl acetate copolymer]/PEG binary additive as compatibilizers were investigated. The possibility of realization of specific fibre formation was established for PP/CPA blends in the phase change region on addition of PEG as a compatibilizer. The study of decomposition of PP microfibres in compatibilized blends demonstrated a stabilizing effect on liquid jets of PP in a CPA matrix.In fabrication of ultrafine synthetic fibres by processing melts of polymer blends in certain conditions, one of the components (fibre-forming) forms a multitude of microfibres oriented in the direction of extrusion in the mass of the other (matrix) polymer under the effect of flow forces. This phenomenon is called specific fibre formation [1].We know that in polymer blends, when the ratio of components changes, phase inversion takes place; its essence is that the dispersion medium and disperse phase change roles under the effect of external factors (change in the composition of the blend, addition of a new substance, change in temperature, etc.). In polymer blends, the phase change region covers a wide range of compositions, where both phases are continuous (matrix structures). For polypropylene/copolyamide (PP/CPA) blends, the phase change region covers a 40/60, 50/50, and 60/40 wt. % ratio of components. Previous studies [1] showed that specific fibre formation is most distinctly realized for a 20-30 wt. % disperse phase content. Fibre formation does not take place in the phase change region. However, macro-and microflow processes in melts of polymer blends can be controlled by adding compatibilizers (substances that improve the compatibility of the components of a blend) [2][3][4].We investigated the macro-and microflow processes in compatibilized PP/CPA blends of 50/50 wt. % composition with polyethylene glycol (PEG) additive in the amount of 0.5, 1.0, 3.0, and 5.0% of the weight of the PP. Since [5] shows that a mixture of compatibilizers is more effective than the individual substances, we used a binary mixture of the copolymer of ethylene and vinyl acetate (EVAC)/PEG in the ratio of 0.5/0.5, 1.0/1.0, 5.0/5.0, and 10.0/3.0% of the weight of the PP. The characteristics of these polymers are reported in [6]. CPA (PA-6/66, OST 6-05-438-78) is the copolymer of caprolactam and hexamethylene adipate in the ratio of 50/50. Its melting point is close to t m of PP (brand 21060, TU 6-05-1756-78). On heating, it dissolves in ethyl alcohol, which is also used for extraction of CPA from composite extrudates to separate PP microfibres. PEG, a dihydric alcohol, has CH 2 CH 2 groups and two terminal hydroxyl groups along the length of its chain, which makes it a biphilic compatibilizer for PP/CPA blends.The polymers were blended and additives were incorporated with a LGP-25 industrial combined screw-disk extruder which finely disperses one polymer in ano...

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Cited by 6 publications

References 5 publications

Regularities of Fabrication of Nanofilled Polymeric Materials with Matrix–Fibrillar Structure

Regularities of Fabrication of Nanofilled Polymeric Materials with Matrix–Fibrillar Structure

Mathematical Modelling and Software Development to Optimize the Composition of Four-Component Nanofilled Systems

Specific Fibre Formation in Flow of Melts of Polypropylene/Copolyamide Blends in the Phase Change Region

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