Origin of toughness in .beta.-polypropylene: the effect of molecular mobility in the amorphous phase

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61389013%3A_____%2F15%3A00440934" target="_blank" >RIV/61389013:_____/15:00440934 - isvavai.cz</a>
Result on the web
<a href="http://dx.doi.org/10.1016/j.polymer.2015.01.047" target="_blank" >http://dx.doi.org/10.1016/j.polymer.2015.01.047</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1016/j.polymer.2015.01.047" target="_blank" >10.1016/j.polymer.2015.01.047</a>

Result language
angličtina
Original language name
Origin of toughness in .beta.-polypropylene: the effect of molecular mobility in the amorphous phase
Original language description
This study aims to explore the origin of toughness in ?-phase isotactic polypropylene (i-PP). Samples of commercial-grade i-PP, both neat and nucleated with a specific ?-nucleating agent (N,N-dicyclohexylnaphthalene-2,6-dicarboxamide), were subjected toa combination of structure-sensitive methods and fracture mechanical testing. In addition to common structural characterisation methods, solid-state NMR data were collected to obtain information about the dynamics of the polymer segments as well as the structure. In particular, temperate-induced transformation between the free and constrained amorphous phase was monitored by variable-temperature 13C MAS NMR, whereas T1?(1H) relaxation was used to estimate correlations times of segmental motions. Lower thermodynamic stability of rigid amorphous fraction was found in the ?-crystalline systems. In contrast helical chains in crystalline and constrained amorphous phase were found to be more restrained in the ?-crystalline system. Overall, th
Czech name
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Czech description
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Type
J<sub>x</sub> - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)
CEP classification
JI - Composite materials
OECD FORD branch
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Project
<a href="/en/project/GA13-29009S" target="_blank" >GA13-29009S: Effects of filler surface on molecular mobility and resulting deformation and fracture behaviour of thermoplastic polymer composites</a><br>
Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year
2015
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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