Impact of particle morphology on structure, crystallization kinetics, and properties of PCL composites with TiO2-based particles

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61389013%3A_____%2F17%3A00470668" target="_blank" >RIV/61389013:_____/17:00470668 - isvavai.cz</a>

Result on the web

<a href="http://dx.doi.org/10.1007/s00289-016-1723-2" target="_blank" >http://dx.doi.org/10.1007/s00289-016-1723-2</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1007/s00289-016-1723-2" target="_blank" >10.1007/s00289-016-1723-2</a>

Result language

angličtina

Original language name

Impact of particle morphology on structure, crystallization kinetics, and properties of PCL composites with TiO2-based particles

Original language description

Crystallization kinetics of polycaprolactone (PCL) filled with TiO2-based particles (TiX) was shown to depend on the TiX particle type and concentration, which were associated with a slight polymer matrix degradation. The partially degraded, shorter, and more mobile polymer chains increased the overall crystallization rate at the initial stage of crystallization, while at the later stages, the non-nucleating TiX particles acted as a sterical hindrance, slowing down the crystallization process. The PCL/TiX composites were prepared by melt-mixing and contained 2.5 and 5 wt% of the filler. The investigated TiX particles included isometric anatase microparticles (mTiO2) and titanate nanotubes with high-aspect ratio (TiNT). Light and electron microscopy showed very homogeneous dispersion of the mTiO2 particles in the PCL matrix, while the TiNT formed large agglomerates. In situ polarized light microscopy displayed faster isothermal crystallization of all PCL/TiX composites, but the micrographs indicated that the TiX particles did not act as nucleation centres. Isothermal DSC experiments, evaluated in terms of Avrami theory, confirmed the PLM results and showed that the overall rate of isothermal crystallization increased in the following order: PCL <PCL/TiNT <PCL/mTiO2. Non-isothermal DSC and rheological measurements revealed the correlation between the crystallization rate and the polymer matrix degradation—the well-dispersed mTiO2 particles with high specific surface caused the highest PCL degradation and, consequently, the earliest start of non-isothermal crystallization as well as the fastest isothermal crystallization. Microindentation hardness measurements confirmed that the partial degradation of the polymer matrix did not have a significant impact on the mechanical performance of PCL/mTiO2 composites.

Czech name

—

Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

—

OECD FORD branch

10404 - Polymer science

Project

Result was created during the realization of more than one project. More information in the Projects tab.

Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2017

Confidentiality

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

Name of the periodical

Polymer Bulletin

ISSN

0170-0839

e-ISSN

—

Volume of the periodical

74

Issue of the periodical within the volume

2

Country of publishing house

DE - GERMANY

Number of pages

20

Pages from-to

445-464

UT code for WoS article

000393033100009

EID of the result in the Scopus database

2-s2.0-84974777662