High-resolution solid-state NMR study of isotactic polypropylenes

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61389013%3A_____%2F12%3A00370564" target="_blank" >RIV/61389013:_____/12:00370564 - isvavai.cz</a>

Výsledek na webu

<a href="http://dx.doi.org/10.3144/expresspolymlett.2012.23" target="_blank" >http://dx.doi.org/10.3144/expresspolymlett.2012.23</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.3144/expresspolymlett.2012.23" target="_blank" >10.3144/expresspolymlett.2012.23</a>

Jazyk výsledku

angličtina

Název v původním jazyce

High-resolution solid-state NMR study of isotactic polypropylenes

Popis výsledku v původním jazyce

The high-resolution solid-state 13C and 1H NMR spectra, and 13C rotating frame spin-lattice relaxation times, were measured for metallocene (m) and Ziegler-Natta (ZN) isotactic polypropylenes (iPP) within the temperature range of 20?160°C. With the riseof temperature the splitting of CH2, CH and CH3 signals into two components was detected in 13C NMR spectra and assigned to amorphous and crystalline phases. The temperature dependences of chemical shifts and integral intensities obtained from the deconvoluted spectra provided information on the main chain and CH3 groups motions in amorphous and crystalline regions of studied samples. While values of relaxation times show that the rate of segmental motion in amorphous regions in m-iPP and ZN-iPP is virtually the same, larger linewidths in 13C and 1H NMR spectra indicate somewhat larger restraints of the motion in amorphous regions of ZN-iPP.

Název v anglickém jazyce

High-resolution solid-state NMR study of isotactic polypropylenes

Popis výsledku anglicky

The high-resolution solid-state 13C and 1H NMR spectra, and 13C rotating frame spin-lattice relaxation times, were measured for metallocene (m) and Ziegler-Natta (ZN) isotactic polypropylenes (iPP) within the temperature range of 20?160°C. With the riseof temperature the splitting of CH2, CH and CH3 signals into two components was detected in 13C NMR spectra and assigned to amorphous and crystalline phases. The temperature dependences of chemical shifts and integral intensities obtained from the deconvoluted spectra provided information on the main chain and CH3 groups motions in amorphous and crystalline regions of studied samples. While values of relaxation times show that the rate of segmental motion in amorphous regions in m-iPP and ZN-iPP is virtually the same, larger linewidths in 13C and 1H NMR spectra indicate somewhat larger restraints of the motion in amorphous regions of ZN-iPP.

Druh

J_x - Nezařazeno - Článek v odborném periodiku (Jimp, Jsc a Jost)

CEP obor

CD - Makromolekulární chemie

OECD FORD obor

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Projekt

—

Návaznosti

Z - Vyzkumny zamer (s odkazem do CEZ)

Rok uplatnění

2012

Kód důvěrnosti údajů

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

Název periodika

EXPRESS POLYMER LETTERS

ISSN

1788-618X

e-ISSN

—

Svazek periodika

6

Číslo periodika v rámci svazku

3

Stát vydavatele periodika

HU - Maďarsko

Počet stran výsledku

9

Strana od-do

204-212

Kód UT WoS článku

000299169000005

EID výsledku v databázi Scopus

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