Polyvinyl butyral chemically modified with a silane agent in the molten state

Abstract

Recycled polyvinyl butyral (PVB) from the automotive industry was chemically modified by melt mixing with a vinyl trimethoxysilane (VTMS) silanation reagent, which tends to react with the hydroxyls present in the PVB structure to generate crosslinked bonds between the chains. This chemical modification resulted in the improvement of the solvent resistance to organic solvents without deeply impairing the mechanical properties of the polymer. The mixing of PVB with VTMS was carried out in an internal mixer equipped with roller type rotors and the mixture was subsequently compression molded. Soxhlet extraction confirmed a 70% increase in the modified polymer gel content. Depending on the mixing time, the dynamic crosslinking reactions occurring during this time did not prevent the compression molding of the polymer. Furthermore, static crosslinking was observed during compression molding, which resulted in the maximum crosslinking degree and solvent resistance. DMA analysis indicated different molecular structures produced by different mixing times and varying static and dynamic crosslink ratios. Infrared spectroscopy (FTIR) indicated that dibutyl sebacate was the main plasticizer of the recycled PVB. Thermogravimetric analysis suggested that the molecular structure of the modified polymer affected the decomposition of PVB. POLYM. ENG. SCI. 56:971–979, 2016. © 2016 Society of Plastics Engineers

A Scalable, Robust Polyvinyl‐Butyral‐Based Solid Polymer Electrolyte with Outstanding Ionic Conductivity for Laminated Large‐Area WO3–NiO Electrochromic Devices

“…The use of silanization reagents as additives to enhance the performance of SPEs is receiving increasing attention. [36][37][38][39][40][41] Puguan et al utilized 3-isocyanatopropyltriethoxysilane as a coupling agent to graft ZrO 2 nanoparticles onto a PVDF-cohexafluoropropylene electrolyte. [38] Deka et al prepared a polysiloxane-and polyetherdiamine-based comb-shaped SPE to fabricate an ECD with an ionic conductivity of 6.5 × 10 −5 S cm −1 at 30 °C.…”

Combined heat‐ and light‐induced shape memory behavior of RPVB/SMA/NRGO composites by reactive melt blending

“…The hydrophilic vinyl alcohol and vinyl acetate units provide PVB high adhesion to many substrates. The vinyl butyral units are hydrophobic and give PVB excellent processibility, toughness and compatibility with many polymers and plasticizers 3,4 …”

“…The maximum impact strength of the obtained PA6 blends was 24 times higher than that of neat PA6. Sonego et al 4 studied the chemical modification of RPVB with vinyl trimethoxysilane (VTMS) through melt mixing to increase its solvent resistance to ethanol.…”

“…The vinyl butyral units are hydrophobic and give PVB excellent processibility, toughness and compatibility with many polymers and plasticizers. 3,4 Plasticized PVB film that has suitable elasticity, toughness and adhesion to many surfaces is prepared by mixing PVB with high molecular weight and plasticizer and is mostly applied for the preparation of laminated safety glass. It is generally known that a large amount of PVB film offcut is formed during the glass lamination process.…”

“…The maximum impact strength of the obtained PA6 blends was 24 times higher than that of neat PA6. Sonego et al 4 studied the chemical modification of RPVB with vinyl trimethoxysilane (VTMS) through melt mixing to increase its solvent resistance to ethanol. Shape memory polymers (SMPs) are those which have the capacity of holding a temporary shape under appropriate conditions and recover to their original (or permanent) shape when exposed to an external stimuli.…”