POLYCAPROAMIDE COMPOSITES WITH IMPROVED PERFORMANCE CHARACTERISTICS
| Autor: | V.Ye. Levytskyi, A. S. Masyuk |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
chemistry.chemical_classification
Filler (packaging) Materials science Thermoplastic Polyvinylpyrrolidone Polymer Hardness Polyvinyl alcohol Crystallinity chemistry.chemical_compound chemistry Ultimate tensile strength medicine General Earth and Planetary Sciences Composite material General Environmental Science medicine.drug |
| Zdroj: | Scientific Bulletin of UNFU. 27:122-127 |
| ISSN: | 2519-2477 1994-7836 |
| DOI: | 10.15421/40270427 |
| Popis: | The development of new polymeric composite materials (PCM) with high performance properties based on thermoplastic matrices and inorganic fillers are one of the most promising areas of technology of polymeric and composite materials. At the same time, polycaproamide (PA-6) is the widespread thermoplastic polymer for constructive use. Ni-containing polymer-silicate filler modified by polyvinyl alcohol or polyvinylpyrrolidone, which is obtained by coprecipitation of sodium silicate and polyvinyl alcohol or polyvinylpyrrolidone under the influence of nickel chloride in aqueous solution was used to create the composites based on PA-6. Based on X-ray studies the influence of polymer-silicate filler on the supramolecular structure of PA-6 has been established. The introduction of filler leads to changes in the morphology of developed composites, the degree of crystallinity is increasing by 15-20 % and is reduced the average size of crystallite by ~ 20 %, due to the formation of additional crystallization centers in the system with the direct participation of the filler. The highest values of the degree of crystallinity of PA-6 materials have been observed for the composites with modified filler, due to changes in the polymer packaging of macrochains caused by interfacial interactions of polymer matrix-modifier-filler. The introduction of the modified filler increases the performance characteristics of materials based on PA-6. The value of ultimate tensile strength at breaking of composites increases by 30-35 %, modulus of elasticity by 25-30 % and surface hardness by 25-35 % compared to PA-6. It should be noted that the introduction of filler in PA-6 also contributes to increases of soft point by Vick at 15-20 K and reduces the coefficient of linear thermal expansion by 3-4 times. The greatest value of heat resistance is found for composites based on Ni-containing unmodified filler and least for the unfilled polymer. Thus, the increased mechanical, elastic-deformational and thermophysical properties of developed composites provide their effective use for the manufacture of materials for constructional and thermotechnical purposes in various industries. |
| Databáze: | OpenAIRE |
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