Ionomer–silica hybrids via sol–gel reaction

Autor:	Namita Roy Choudhury, Yan Gao, Naba K. Dutta, L. Delmotte
Přispěvatelé:	Dutta, Naba Kumar, Choudhury, Namita Roy, Delmotte, Luc, Gao,Yan
Rok vydání:	2005
Předmět:	Polymers and Plastics Organic Chemistry Condensation Silane Solvent chemistry.chemical_compound Hydrolysis Synthesis of Materials chemistry Chemical engineering Chemical Characterisation of Materials Polymer chemistry Materials Chemistry Thermal stability Hybrid material Ionomer Sol-gel
Zdroj:	Polymer. 46:4013-4022
ISSN:	0032-3861
DOI:	10.1016/j.polymer.2005.03.053
Popis:	Ionomer–silica hybrid materials were made from polyethylene-co-acrylic acid neutralized by a zinc salt (PI) and tetraethoxy silane (TEOS) via the sol–gel reaction. The effects of various experimental parameters such as solvents, H2O/Si ratio and the amount of TEOS in the ionomer solution on the hybrid structure and properties were examined. The spectroscopic results show that solvents do not affect the structure of the hybrids, but influence the thermal properties. The hybrids made using highly polar solvent exhibit better thermal stability and dynamic mechanical properties at high TEOS contents. The amount of water used for hydrolysis and subsequent condensation play a significant role in the network formation. The varying amount of TEOS in solutions gives rise to different silica content of the hybrid. Above 50 wt%, the sample becomes opaque due to silica aggregation. The high ratio of H2O/Si leads to phase separation during the reaction. Transparent hybrid materials can only be obtained when the ratio of H2O/Si is below 5.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::87c5a081e6d7515faa4e8ac96978dc00 https://doi.org/10.1016/j.polymer.2005.03.053 Zobrazit plný text záznamu Full Text from ScienceDirect