Statistical copolymers of norbornene and 5‐vinyl‐2‐norbornene by a ditungsten complex mediated ring‐opening metathesis Polymerization: Synthesis, thermal properties, and kinetics of thermal decomposition. Issue 22 (16th September 2013)

• Record Type: Journal Article
• Authors: Floros, Georgios; Agrafioti, Fotini; Grigoropoulos, Alexios; Paraskevopoulou, Patrina; Mertis, Konstantinos; Tseklima, Maria; Veli, Maria; Pitsikalis, Marinos
• Is Part Of: Journal of polymer science. Volume 51:Issue 22(2013:Nov.)
• Page Start: 4835
• Page End: 4844
• Publication Date: 2013-09-16
• Subjects: 547
• DOI: 10.1002/pola.26909
• Languages: English
• ISSNs: 0887-624X

Abstract

<abstract abstract-type="main"> <title>ABSTRACT</title> <p>Statistical copolymers of norbornene (NBE) with 5‐vinyl‐2‐norbornene (VNBE) were prepared by ring‐opening metathesis polymerization, employing the triply bonded ditungsten complex Na[W₂(μ‐Cl)₃Cl₄(THF)₂].(THF)₃. NMR measurements revealed that the side vinyl groups of the VNBE monomer remain intact during the copolymerization reaction. The reactivity ratios were estimated using the Finemann–Ross (FR), the inverted FR, and the Kelen–Tüdos graphical methods. Structural parameters of the copolymers were obtained by calculating the dyad sequence fractions, which were derived using the monomer reactivity ratios. The glass transition temperatures, <italic>T</italic>_g, of the copolymers were measured by differential scanning calorimetry measurements and were examined in the frame of several theoretical equations allowing the prediction of these <italic>T</italic>_g values. The best fit was obtained using methods that take into account the monomer sequence distribution of the copolymers. Finally, the kinetics of the thermal decomposition of the copolymers was studied by thermogravimetric analysis in the frame of the Ozawa–Flynn–Wall and Kissinger methods. © 2013 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. <bold>2013</bold>, <italic>51</italic>, 4835–4844</p> </abstract>