Dependence of Thermal Stability of Polymers on Their Chemical Structure

Korshak, V.V.; Виноградова, С. В.

doi:10.1070/rc1968v037n11abeh001712

Cited by 33 publications

(10 citation statements)

References 3 publications

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“…The glass transition temperature of the present polymer is determined as high as 360 °C ( Figure 11 B), which greatly exceeds the value determined for known crosslinked cyanate polymers (192–289 °C) [ 3 , 30 , 43 ]. Apparently, such exceptional thermal stability, high glass transition temperature, and char yield are associated with the rigid polyaromatic nature of the cyanate ester monomer [ 15 , 16 , 44 , 45 ]. Moreover, one should generally expect that introducing polar groups or groups capable of forming hydrogen bonds into the aromatic rings of the monomer to lead to an increase in T g of a polymer.…”

Section: Resultsmentioning

confidence: 99%

Synthesis and Polymerization Kinetics of Rigid Tricyanate Ester

et al. 2021

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A new rigid tricyanate ester consisting of seven conjugated aromatic units is synthesized, and its structure is confirmed by X-ray analysis. This ester undergoes thermally stimulated polymerization in a liquid state. Conventional and temperature-modulated differential scanning calorimetry techniques are employed to study the polymerization kinetics. A transition of polymerization from a kinetic- to a diffusion-controlled regime is detected. Kinetic analysis is performed by combining isoconversional and model-based computations. It demonstrates that polymerization in the kinetically controlled regime of the present monomer can be described as a quasi-single-step, auto-catalytic, process. The diffusion contribution is parameterized by the Fournier model. Kinetic analysis is complemented by characterization of thermal properties of the corresponding polymerization product by means of thermogravimetric and thermomechanical analyses. Overall, the obtained experimental results are consistent with our hypothesis about the relation between the rigidity and functionality of the cyanate ester monomer, on the one hand, and its reactivity and glass transition temperature of the corresponding polymer, on the other hand.

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Section: Resultsmentioning

confidence: 99%

Synthesis and Polymerization Kinetics of Rigid Tricyanate Ester

et al. 2021

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“…The etching rates for aromatic polymers are relatively lower compared to aliphatic ones due to the extra energy stabilization (~36 kcal/mole), provided by the aromaticity of the rings in the polymeric chain. One more explanation to support the distinct etching rate is that the aliphatic rings degrade easily to form volatile molecules, whereas the aromatics generally form more non-volatile fragments and are not easily removed from the surface [ 71 ]. However, plasma-initiated degradation can occur on the bond–ring junctions, which are connected through relatively unstable secondary or tertiary carbon atoms.…”

Section: The Origin Of Plasma Etching Selectivitymentioning

confidence: 99%

Selective Plasma Etching of Polymeric Substrates for Advanced Applications

2016

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In today’s nanoworld, there is a strong need to manipulate and process materials on an atom-by-atom scale with new tools such as reactive plasma, which in some states enables high selectivity of interaction between plasma species and materials. These interactions first involve preferential interactions with precise bonds in materials and later cause etching. This typically occurs based on material stability, which leads to preferential etching of one material over other. This process is especially interesting for polymeric substrates with increasing complexity and a “zoo” of bonds, which are used in numerous applications. In this comprehensive summary, we encompass the complete selective etching of polymers and polymer matrix micro-/nanocomposites with plasma and unravel the mechanisms behind the scenes, which ultimately leads to the enhancement of surface properties and device performance.

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“…We have assumed that the thermal stability of the networks reported in this paper may exceed the thermal stability of the linear polymers of similar composition [ 37 ] reported previously. [ 28 ] However, the higher content of Br CH 2 groups in the networks reduced the positive effect of the cross-linked architecture on the thermal stability.…”

Section: Thermal Stability Of the Polymer Networkmentioning

confidence: 85%

Ionic π-Conjugated Polymer Networks by Catalyst-Free Polymerization, Photoluminescence and Gas Sorption Behavior

Faukner

Zukal

Brus

et al. 2016

Macromol. Chem. Phys.

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Four monomers of the bis(pyridyl)acetylene and bis[(pyridyl)ethynyl]benzene types containing either 2‐pyridyl or 4‐pyridyl groups are polymerized into respective networks of the conjugated polyelectrolyte (CPE) type by catalyst‐free polymerization via activation with 1,4‐bis(bromomethyl)benzene as quaternization agent (QA). Prepared CPE networks are characterized by elemental analysis (EA), TGA analysis, 13C cross‐polarization magic‐angle spinning NMR, IR, UV/vis, and photoluminescence spectroscopies. Highly cross‐linked network structure containing both π‐conjugated polyacetylene type chains and ionic alternating type chains is proposed. According to EA analysis, the mole ratio of units derived from monomer molecules and QA molecules is close to unity in all prepared networks. The CPE networks based on 4‐pyridyl monomers exhibit strong photoluminescence in the visible region after irradiation with light of wavelength of 378 nm. Prepared CPE networks also show moderate efficiency in CO2 sorption up to 13.6 cm3 g−1 (STP) and exceptionally high ethanol vapor capture efficiency up to 24.5 wt% (293 K). The specific interactions of ionic network and adsorbed molecules and also temporary pores formation are assumed to play important role in sorption processes.

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Dependence of Thermal Stability of Polymers on Their Chemical Structure

Cited by 33 publications

References 3 publications

Synthesis and Polymerization Kinetics of Rigid Tricyanate Ester

Synthesis and Polymerization Kinetics of Rigid Tricyanate Ester

Selective Plasma Etching of Polymeric Substrates for Advanced Applications

Ionic π-Conjugated Polymer Networks by Catalyst-Free Polymerization, Photoluminescence and Gas Sorption Behavior

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