The Effect of Sorbitor-based Nucleating Agent on Crystallization and Recrystallization of Polybut-1-ene

Kód výsledku v IS VaVaI

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Výsledek na webu

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DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

The Effect of Sorbitor-based Nucleating Agent on Crystallization and Recrystallization of Polybut-1-ene

Popis výsledku v původním jazyce

The work deals with the crystallization and recrystallization of polybut-1-ene (PB-1) and random PB-1 copolymer. The effect of the addition of the nucleating agent (NU) 1,2,3,4-bis(3,4-dimethylbenzylidene) sorbitol, commercial clarifying agent for polypropylene Millad 3988, on the crystallization and subsequent recrystallization is studied, particularly in relation to the kinetics of the process. The NU was mixed into PB-1 at concentrations of 0.2 and 0.6 wt.% using a twin-screw extruder. The crystallization and recrystallization in defined times of ageing at room temperature was characterized by spectrophotometry, wide-angle X-ray scattering (WAXS) and differential scanning calorimetry (DSC). It was found, that the addition of NU increases the haze significantly, which is probably due to the change in the spherulitic structure. WAXS analysis revealed that NU acceleratesrecrystallization from phase II to I in homopolymer. In the case of the copolymer, the effect of NU is not as pronounced, however, it also interferes with the recrystallization process. According to DSC, the addition of NU increases the crystallization temperature as well as narrows the crystallization peak, which means that the overall crystallization process is accelerated. This effect is more pronounced in copolymer. Moreover, the copolymer samples with the addition of NU have significantly narrower melting peaks, which corresponds to the formation of a more uniform structure. Thus, it can be confirmed that the addition of commercial NU Millad 3988 has a significant effect on the crystallization and recrystallization behavior of both the PB-1 homopolymer and the PB-1 copolymer, even at a concentration of 0.2 wt.%. With higher concentrations of this NU, the processes do not change significantly.

Název v anglickém jazyce

The Effect of Sorbitor-based Nucleating Agent on Crystallization and Recrystallization of Polybut-1-ene

Popis výsledku anglicky

The work deals with the crystallization and recrystallization of polybut-1-ene (PB-1) and random PB-1 copolymer. The effect of the addition of the nucleating agent (NU) 1,2,3,4-bis(3,4-dimethylbenzylidene) sorbitol, commercial clarifying agent for polypropylene Millad 3988, on the crystallization and subsequent recrystallization is studied, particularly in relation to the kinetics of the process. The NU was mixed into PB-1 at concentrations of 0.2 and 0.6 wt.% using a twin-screw extruder. The crystallization and recrystallization in defined times of ageing at room temperature was characterized by spectrophotometry, wide-angle X-ray scattering (WAXS) and differential scanning calorimetry (DSC). It was found, that the addition of NU increases the haze significantly, which is probably due to the change in the spherulitic structure. WAXS analysis revealed that NU acceleratesrecrystallization from phase II to I in homopolymer. In the case of the copolymer, the effect of NU is not as pronounced, however, it also interferes with the recrystallization process. According to DSC, the addition of NU increases the crystallization temperature as well as narrows the crystallization peak, which means that the overall crystallization process is accelerated. This effect is more pronounced in copolymer. Moreover, the copolymer samples with the addition of NU have significantly narrower melting peaks, which corresponds to the formation of a more uniform structure. Thus, it can be confirmed that the addition of commercial NU Millad 3988 has a significant effect on the crystallization and recrystallization behavior of both the PB-1 homopolymer and the PB-1 copolymer, even at a concentration of 0.2 wt.%. With higher concentrations of this NU, the processes do not change significantly.

Druh

O - Ostatní výsledky

CEP obor

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OECD FORD obor

10404 - Polymer science

Projekt

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Návaznosti

V - Vyzkumna aktivita podporovana z jinych verejnych zdroju

Rok uplatnění

2024

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů