Development of exfoliated nanocomposite prepared from vinyl acetate and montmorillonite

Abstract

To improve the chemical, physical, mechanical and thermal properties of polyvinyl acetate (PVAc), montmorillonite (MMT) was added and polymerised with vinyl acetate to prepare an exfoliated nanocomposite of PVAc-MMT. Linear macromolecular chains of PVAc were formed between MMT layers and they exfoliated MMT into layers or sheets of nanoparticles. Both PVAc and PVAc-MMT were pseudoplastic non-Newtonian fluids, and possessed the normal stress effect (or Weissenberg effect) that was the pole climbing phenomenon. PVAc-MMT's static tensile properties were better, and PVAc's glass transition temperature was lowered by MMT. Both PVAc and PVAc-MMT possessed cold crystallisation, and their pyrolysis were similar, because MMT had no obvious effect on pyrolysis temperatures but mainly delayed thermal degradation processes.

Synthesis and Characterization of PVAc‐MMT‐DOAB Exfoliated Nanocomposites: Reducing Polymerization Time and Water in the Synthesis

“…If the content increased and exceeded a certain amount, the exfoliated layers would decrease while the aggregated layers would increase. In our synthesis, MMT‐DOAB was optimized at 2% of VAc and would have good effect on the development of exfoliated nanocomposites.…”

“…In our previous study, PVAc‐MMT, PVAc‐MMT‐octadecyl trimethyl ammonium bromide (STAB), and PVAc‐MMT‐dioctadecyl dimethyl ammonium bromide (DOAB) were synthesized through a single process. The polymerization time of 6 h and the water weight of 250 g were used as constant.…”

Dynamic Mechanical and Thermal Kinetics of Polyvinyl Acetate Type Emulsions from Vinyl Acetate, N‐hydroxymethyl Acrylamide, and Montmorillonite

“…22,23 In our previous work, PVAc was modified using montmorillonite (MMT), 24 organic montmorillonite (OMMT), [25][26][27] and N-hydroxymethyl acrylamide (NMA) together with urea 28,29 and MMT. 30 The synthesis condi-Dynamic mechanical properties are usually measured using dynamic mechanical analysis (DMA), and thermal degradation using thermogravimetric analysis (TGA).…”

“…A s an environmental-friendly adhesive, polyvinyl acetate (PVAc) has been used widely in woods, 1-3 boards, 4-6 furniture, 7-9 decorations, [10][11][12] prints, 13 textiles, [14][15][16] papers, 17 coatings, 18,19 foils, 20,21 and fibers. 22,23 In our previous work, PVAc was modified using montmorillonite (MMT), 24 organic montmorillonite (OMMT), [25][26][27] and N-hydroxymethyl acrylamide (NMA) together with urea 28,29 and MMT. 30 The synthesis condi-Contract grant sponsor: National Nature Science Foundation of China, Beijing, China.…”

“…As an environmental‐friendly adhesive, polyvinyl acetate (PVAc) has been used widely in woods, boards, furniture, decorations, prints, textiles, papers, coatings, foils, and fibers . In our previous work, PVAc was modified using montmorillonite (MMT), organic montmorillonite (OMMT), and N ‐hydroxymethyl acrylamide (NMA) together with urea and MMT . The synthesis conditions were obtained, such as NMA at 1% of vinyl acetate (VAc), MMT or OMMT at 2% of VAc, and polymerization time at 6 h, etc.…”