Investigation of thermal stability of ethylene copolymers with POSS - Study under static and dynamic conditions

Groch, Paweł; Dziubek, Katarzyna; Czaja, Krystyna; Grzymek, Marek

doi:10.1016/j.polymdegradstab.2018.09.010

Cited by 16 publications

(9 citation statements)

References 37 publications

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“…Moreover, thermal stability of ethylene copolymers with di-alkenylsilsesquioxanes (POSS-6-2) improved markedly with the increasing content of POSS comonomer regardless of the type of catalyst ( Table 2, items 2 and 3, and 7 and 8). E/POSS copolymers obtained by the bis(phenoxy-imine) zirconium and titanium catalytic systems were characterized by higher thermal stability than monoalkenyl-and monoalkenyl(siloxy)silsesquioxanes obtained over rac-Et(Ind) 2 ZrCl 2 [1]. Noteworthy is that the values of T 5 and T 30 of the copolymers E/POSS obtained in the presence of post-metallocene catalyst were usually lower than for neat polyethylene, regardless of the kind and share of POSS comonomer used.…”

Section: Thermal Stability Of E/poss Copolymersmentioning

confidence: 99%

“…One of the most promising methods for improving thermal stability of polyolefins is development of new materials containing polyhedral oligomeric silsesquioxanes (POSS) [1,2]. POSS are a class of interesting nano-scale units for the synthesis of organic-inorganic hybrid materials [3][4][5][6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

“…POSS are a class of interesting nano-scale units for the synthesis of organic-inorganic hybrid materials [3][4][5][6][7][8][9]. Indeed, incorporation of POSS into polymer chain results in improvement of physicochemical properties, such as mechanical properties [10], thermal stability [1], thermooxidative resistance [1], and flammability [11,12] in comparison with unmodified polymers.…”

Section: Introductionmentioning

confidence: 99%

“…As regards copolymers of olefins with POSS, many investigations were focused on the effect of the completely condensed silicon-oxygen T 8 POSS core with one reactive substituent with cyclopentyl or iso-butyl as non-reactive substituents [1,13,14]. Mono-functional POSS units incorporated into the polymer chain improved thermal stability of obtained materials [8,13,14] and could act as nucleating agents, which accelerate crystallization process of copolymers [7].…”

Section: Introductionmentioning

confidence: 99%

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Thermal behavior of ethylene copolymers with di- and tri-alkenylsilsesquioxane comonomers synthesized by post-metallocene catalysts

Groch

Dziubek

Czaja

et al. 2020

J Therm Anal Calorim

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This paper reported thermal properties of ethylene copolymers with di-and tri-alkenylsilsesquioxanes (POSS) synthesized by bis(phenoxy-imine) Ti, Zr, V, and V salen-type complexes. Ethylene copolymers with multi-alkenyl POSS obtained by such complexes contain multi-alkenyl POSS incorporated into the polymer chain as a side group. They were characterized by different thermal behavior depending on the kind of multi-alkenyl POSS comonomer, and type of the catalyst used, as well as polymerization conditions and thus the structure of the copolymer chain. Ethylene/POSS copolymers differed in incorporation of POSS into the polymer chain, content of specific unsaturation groups, and molecular weight, as well as heterogeneity of polymer chain compositions. The incorporation of multi-alkenyl POSS into the polymer chain affected melting and crystallization processes of copolymers in different ways. The POSS units could act as a nucleating agent of macromolecules. The increasing POSS content in E/POSS copolymers resulted in increasing thermal stability of obtained products, regardless of the kind of multi-alkenylsilsesquioxanes used. Thermal stability of such copolymers increased with decreasing content of trisubstituted vinylene groups (internal saturations) as well. The highest improvement of thermal stability over 85 °C in comparison with PE was observed in case of E/POSS copolymers synthesized by bis(phenoxy-imine) zirconium catalyst. The composition heterogeneity of E/POSS copolymers was found to affect markedly thermal stability of E/POSS copolymers.Publisher's Note Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.

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Section: Thermal Stability Of E/poss Copolymersmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Thermal behavior of ethylene copolymers with di- and tri-alkenylsilsesquioxane comonomers synthesized by post-metallocene catalysts

Groch

Dziubek

Czaja

et al. 2020

J Therm Anal Calorim

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“…The influence of structured polymer materials [ 17 , 18 , 19 ], hybrid composition [ 20 , 21 , 22 ], preparation conditions [ 23 , 24 ] are the main directions that are envisaged by the majority of assays. Unfortunately, the contribution of POSS filler to the delay of oxidation in polymer materials was randomly reported [ 25 , 26 ]. An appropriate study on the antioxidant properties of POSS was previously published [ 27 ], where the stabilization efficiency of this inorganic structure was evaluated by the calculation of activation energy required for the protection of EPDM against accelerated degradation.…”

Section: Introductionmentioning

confidence: 99%

Stabilization Effects of Natural Compounds and Polyhedral Oligomeric Silsesquioxane Nanoparticles on the Accelerated Degradation of Ethylene-Propylene-Diene Monomer

Zaharescu¹,

Blanco

2021

Molecules

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In this work the analysis on the stabilization activities of some natural antioxidants (rosemary extract, capsaicin, quercetin or oleanolic acid) is presented. A similar contribution of an inorganic structure—polyhedral oligomeric silsesquioxane (POSS) nanoparticles—is also evaluated. The stabilization effects on the oxidation protection were investigated for several formulations based on ethylene-propylene-diene-terpolymer (EPDM). The samples were examined in pristine state or after γ-irradiation, when the accelerated degradation scission of polymer macromolecules followed by the mitigation of oxidation. Three evaluation procedures: chemiluminescence, FTIR spectroscopy and thermal analysis were applied for the characterization of stability efficiency. The delaying effect of oxidative aging in EPDM matrix is illustrated by the values of activation energy, which are correlated with the type and concentration of embedded compounds. The durability of studied EPDM formulations is discussed for the assessment of material life. The improved behavior of structured hybrids useful for the optimization application regimes is essentially based on the antioxidant properties of polyphenolic components in the cases of natural antioxidants or on the penetration of free radical intermediates into the free volumes of POSS.

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Novel functionalized isocyanate groups polyhedral oligomeric silsesquioxanes/epoxy composites with advanced thermal and moisture resistance properties

Jiang

et al. 2023

J of Applied Polymer Sci

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The rapid development of the electronic packaging industry has necessitated the production of epoxy resin insulation materials with high heat resistance and low water absorption. In this study a new cross‐linking composite composed of polyhedral oligomeric silsesquioxane (POSS) functionalized with isocyanate groups and epoxy resin (EP) containing phenolic hydroxyl groups. By employing an isocyanate‐hydroxyl process, the cage structure of Ph7POSS with isocyanate functionalization (MP) can be suspended on EP, leading to a significant improvement in the thermal and moisture resistance of the MP/EP composite. Our DSC and TGA studies revealed that the addition of 3% MP to the epoxy resin increased the glass transition temperature by 27.1°C and raised the initial thermal breakdown temperature to 334.5°C. We also utilized a novel quartz crystal microbalance (QCM) technique to continuously monitor the moisture resistance of the composite, and our results showed that the composite absorbed only 0.03% of water. Moreover, the porosity and cross‐linking of the POSS molecules further restricted the movement of the polymer chains, thereby reducing the dielectric constant and dielectric loss of the composite. Consequently, the MP‐modified epoxy composites exhibit excellent properties, which suggest promising applications in the field of electronic packaging.

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Investigation of thermal stability of ethylene copolymers with POSS - Study under static and dynamic conditions

Cited by 16 publications

References 37 publications

Thermal behavior of ethylene copolymers with di- and tri-alkenylsilsesquioxane comonomers synthesized by post-metallocene catalysts

Thermal behavior of ethylene copolymers with di- and tri-alkenylsilsesquioxane comonomers synthesized by post-metallocene catalysts

Stabilization Effects of Natural Compounds and Polyhedral Oligomeric Silsesquioxane Nanoparticles on the Accelerated Degradation of Ethylene-Propylene-Diene Monomer

Novel functionalized isocyanate groups polyhedral oligomeric silsesquioxanes/epoxy composites with advanced thermal and moisture resistance properties

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