Correlation of cross-linked structures and properties in the characterization of dimethyl-diphenylethynyl-silane using DSC, TGA and Py-GC/MS analysis. (February 2015)

• Record Type: Journal Article
• Authors: Chen, Mingfeng; Liu, Canpei; Lin, Jinhuo
• Is Part Of: Polymer degradation and stability. Volume 112(2015:Feb.)
• Page Start: 35
• Page End: 42
• Publication Date: 2015-02
• Subjects: Dimethyl-diphenylethynyl-silane -- Cross-linked -- Characterization -- Structure-property relationship -- Thermal properties; Polymers -- Deterioration -- Periodicals; Stabilizing agents -- Periodicals; Polymères -- Dégradation -- Périodiques; Stabilisants -- Périodiques; 668.9
• DOI: 10.1016/j.polymdegradstab.2014.12.010
• Languages: English
• ISSNs: 0141-3910

Abstract

Abstract: Hybrid monomer with reactive CC linkages, dimethyl-diphenylethynyl-silane (DMPES), is conveniently synthesized and its structure is characterized. The cross-linking behavior of the monomer and its cross-linked structures are inferred from DSC and FTIR. A large exothermic peak is observed in the DSC curve, which indicates that cross-linking occurs during heating to 430 °C via the Diels–Alder and trimerization reactions. The results also supported by the FTIR spectra. After that, pyrolysis-gas chromatography combined with mass spectroscopy (Py-GC/MS) is carried out to identify characteristic products of the pyrolysis (750 °C) of the cross-linked DMPES. A qualitative analysis of the pyrolyzates reveals a pronounced dependence of the cross-linked structures, which presents a good agreement with the results of DSC and FTIR. Furthermore, TGA and SEM measurements are also used to study the thermal properties, which indicate that the cross-linked DMPES exhibits excellent thermal stability and resistance to oxidation. The temperature corresponding to 5% weight loss and the residue at 1000 °C under nitrogen are 610.8 °C and 85.6%, respectively, which is attributed to the highly cross-linked network structures of the cross-linked DMPES. This analytical method is proposed for studying the cross-linked structures of polymer or monomer and gaining insight into understanding the structure-property relationship, which can also be used to design and predict high performance polymer and monomer for advanced materials.