Formation of dimeric 1-alkoxy-3-acyloxytetrabutyldistannoxanes by reaction of dibutyltin oxide with esters

Bonetti, Josyane; Gondard, C.; Pétiaud, Roger; Llauro, Marie‐France; Michel, Alain

doi:10.1016/0022-328x(94)85003-8

Cited by 40 publications

(38 citation statements)

References 16 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Organotin compounds such as DBTO proved to be excellent catalysts in transesterifications for a long time. For instance, Bonetti et al [51] and Bounor-Legaré et al [52] have concluded that DBTO molecules undergo partial hydrolysis-condensation and then catalyze the ester interchange reactions involving in polymer matrices via a reactive distannoxane intermediate having a two-dimensional centrosymmetric dimeric structure by their Lewis acid behavior. The most important key in understanding the catalytic mechanism of bis(acetylacetonato)metal complexes in the present system is the difference in the catalytic efficiency of metal [Cu (acac) 2 2 , and VO(acac) 2 had no catalytic effect.…”

Section: Gel Fraction and Swelling Studies Of Crosslinked Eva/teos Comentioning

confidence: 98%

Dioxomolybdenum(VI) and dioxotungsten(VI) complexes: efficient catalytic activity for crosslinking reaction in ethylene‐vinyl acetate copolymer/alkoxysilane composites

Adachi

Toyomura

Miyakuni

et al. 2015

Polymers for Advanced Techs

View full text Add to dashboard Cite

The catalytic performances of several bis(acetylacetonato)metal complexes [Cu(acac) 2 , Zn(acac) 2 , TiO(acac) 2 , VO (acac) 2 , MoO 2 (acac) 2 , and WO 2 (acac) 2 ] were investigated for the crosslinking reaction via transesterifications in the ethylene-vinyl acetate copolymer/tetraethoxysilane (EVA/TEOS) composite system by means of dynamic attenuated total reflectance Fourier transform infrared, solvent swelling, and solid-state 29 Si cross polarization/magic angle spinning nuclear magnetic resonance techniques. Results of the kinetic examination revealed that MoO 2 (acac) 2 and WO 2 (acac) 2 exhibited a higher catalytic activity than di-n-butyltin(IV) oxide, which is a catalyst most commonly used for the transesterification process in polymer system, but has a toxic effect on the environmental health. And furthermore, the crosslink density and final siloxane network structure of crosslinked EVA/TEOS composites are found to be greatly correlated with the catalyst used. On the basis of the S N 2-Si pathway, a plausible catalytic mechanism of MoO 2 (acac) 2 and WO 2 (acac) 2 was proposed for the crosslinking reaction via transesterifications of the vinyl acetate moieties in EVA backbone with the ethoxysilane groups in one TEOS molecule. The findings in this study may fill the blank in the high performance and environmentally friendly catalyst in the field of the crosslinking reactions in polymer system and provide useful clue for other transesterifications.

show abstract

Section: Gel Fraction and Swelling Studies Of Crosslinked Eva/teos Comentioning

confidence: 98%

Dioxomolybdenum(VI) and dioxotungsten(VI) complexes: efficient catalytic activity for crosslinking reaction in ethylene‐vinyl acetate copolymer/alkoxysilane composites

Adachi

Toyomura

Miyakuni

et al. 2015

Polymers for Advanced Techs

View full text Add to dashboard Cite

show abstract

“…copolymer is obtained (PE/PBT/EVA/DBTO) in All these previous results 12,13 incite us to use situ during processing have been analyzed by dibutyltin oxide in catalytic amounts in a view to scanning electron microscopy. obtain grafted copolymers by transesterification as a route to compatibility between incompatible parent polymers.…”

Section: Introductionmentioning

confidence: 99%

Morphology control of polyester-polyolefin blends by transesterification during processing operations in the presence of dibutyltin oxide

Pesneau

Llauro

Grégoire

et al. 1997

J. Appl. Polym. Sci.

View full text Add to dashboard Cite

PE and PBT are known to be incompatible polymers. A grafted copolymer PBT-EVA has been generated as a compatibilizer in situ during the processing operation by redistributive transesterification between PBT and EVA in the presence of dibutyl tin oxide (DBTO). This copolymer has been isolated by selective extractions from PBT/EVA/DBTO (49.5/49.5/1% in weight) blend after processing in the melt. It has been evidenced by a 1 H-NMR study. This copolymer presents all the resonances of PBT and EVA sequences and some others that have been assigned specificaly to grafting. To achieve these assignments, a model compound obtained by transesterification of EVA with methyl benzoate has been used. When the melt conditions enable synthesis of the grafted copolymer PBT-EVA in situ during processing operations, important changes in the morphology of PE/PBT/EVA/DBTO blends are observed. SEM analysis shows a decrease of PBT particle size and a good adhesion between the PBT and PE phase.

show abstract

“…In previous studies, 13,14 we showed that DBTO reacts with ester groups to form distannoxane structures, the true catalyst of the transesterification reaction. Therefore, during the synthesis of EVAh, DBTO reacts with ester groups of EVA to form distannoxane structures.…”

Section: Influence Of Evahmentioning

confidence: 98%

“…Recently, our work has shown that dibutyltin oxide (DBTO) reacts with ester groups to form alkoxy-acyloxy distannoxanes. [13][14][15] These compounds are good catalysts for transesterification reactions.…”

Section: Introductionmentioning

confidence: 99%

Morphology monitoring of PE/PBT blends by reactive processing

Pesneau

Cassagnau

Michel

2001

J of Applied Polymer Sci

View full text Add to dashboard Cite

Polyethylene (PE)/poly(butylene terephthalate) (PBT) blends were in situ compatibilized during a processing operation by the addition of a partially hydroxylated ethylene vinyl acetate copolymer (EVAh). This copolymer, obtained from ethylene vinyl acetate (EVA), was as compatible with PE as EVA was before modification. In the presence of EVAh, the dispersion of PBT in the PE matrix was finer, and the interfacial adhesion was improved. These results are relevant for the compatibilization of PE/PBT blends. Moreover, such blends present good toluene barrier properties.

show abstract

Formation of dimeric 1-alkoxy-3-acyloxytetrabutyldistannoxanes by reaction of dibutyltin oxide with esters

Cited by 40 publications

References 16 publications

Dioxomolybdenum(VI) and dioxotungsten(VI) complexes: efficient catalytic activity for crosslinking reaction in ethylene‐vinyl acetate copolymer/alkoxysilane composites

Dioxomolybdenum(VI) and dioxotungsten(VI) complexes: efficient catalytic activity for crosslinking reaction in ethylene‐vinyl acetate copolymer/alkoxysilane composites

Morphology control of polyester-polyolefin blends by transesterification during processing operations in the presence of dibutyltin oxide

Morphology monitoring of PE/PBT blends by reactive processing

Contact Info

Product

Resources

About