Influence of Novel Nucleating Agent on the Mechanical Properties and Crystallinity of Polyoxymethylene

Jiang, Li; Jiang, Feng; Yang, Jun; Li, Rui Kang; Hu, Yan Ping

doi:10.4028/www.scientific.net/amr.466-467.31

Cited by 1 publication

(2 citation statements)

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“…TiNT were prepared according to our previous work (Kralova et al, 2010;Mikešová et al, 2013) with initial concentration 3 g TiO 2 in 100 g 10M NaOH. Talc microparticles (mTalc; type Steamic 00S, fineness ≤10 µm) were bought from Talc de Luzenac, France.…”

Section: Methodsmentioning

confidence: 99%

“…We compare nucleating activity of three inorganic compounds: talc, chalk, and titanate nanotubes (TiNT). Talc and chalk are known, strong nucleating agents for POM (Shu et al, 2006;Nowacki and Piorkowska, 2007), while TiNT are new, laboratory-synthesized nanoparticles (Kralova et al, 2010), which exhibited certain nucleating activity in radiation-modified polypropylene (Mikešová et al, 2013). We show that the sandwich method is reliable and reproducible if the samples are prepared carefully.…”

Section: Introductionmentioning

confidence: 95%

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In situ Observation of Nucleated Polymer Crystallization in Polyoxymethylene Sandwich Composites

et al. 2015

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We introduce a dynamic sandwich method, which can be used for in situ observation and quantification of polymer crystallization nucleated by micro/nanoparticles. The method was applied on polyoxymethylene (POM) composites with three nucleating agents: talc micropowder (POM/mTalc), chalk nanopowder (POM/nChalk), and titanate nanotubes (POM/TiNT). The nucleating agents were deposited between polymer films, the resulting sandwich samples were consolidated by thermal treatment, and their microtomed cross-sections were observed during isothermal crystallization by polarized light microscopy (PLM). As the intensity of polarized light was shown to be proportional to the relative crystallinity, the PLM results could be fitted to Avrami equation and the nucleating activity of all investigated particles could be quantified by means of Avrami parameters (n, k ). The crystallization half-times increased reproducibly in the following order: POM/nChalk < POM/mTalc < POM/TiNT~POM. For strong nucleating agents (mTalc, nChalk), the crystallization kinetics corresponded to spontaneous crystallization starting from central nucleating layer, which was verified by computer simulations. The results were also confirmed by differential scanning calorimetry. We concluded that the sandwich method is an efficient microscopic technique for detailed evaluation of nucleating activity of arbitrary micro/nanoparticles in polymer systems.

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Section: Methodsmentioning

confidence: 99%