Study on the dehydrofluorination of vinylidene fluoride (VDF) and hexafluoropropylene (HFP) copolymer

Modified Poly(vinylidene fluoride-co-hexafluoropropylene) Polymer Electrolyte for Enhanced Stability and Polymer Degradation Inhibition toward the Li Metal Anode

“…As for SPE-OH, the signals of CO 3 2– are the least in the three samples. In addition, considering that the polymer skeleton of SPE-OH is dehydrofluorinated PVDF-HFP and previous studies have proved that the hydroxyl group would combine with C atoms of the PVDF-HFP molecular chains due to dehydrofluorination, , the undecomposed polymers would also bring in extra C–O signals and the actual amount of C–O signals that represent the decomposed polymers in the SPE-OH sample is even less than that the spectrum shows. Hence, the decomposition conditions in SPE-OH are the least severe among the three samples.…”

Mechanically Robust, Reprocessable Shape Memory Fluorosilicon Materials Using β-H Elimination Reaction and in Situ Interfacial Compatibilization

“…Considering the intrinsic inertness nature of PVDF lacking of reactive functional groups, defluorination process via β-H elimination reaction was used to introduce internal double bonds onto PVDF chains. − The digital pictures of virgin and brown modified-PVDF (mPVDF) are shown in Figure b, and the corresponding FT-IR results were discussed in the subsequent parts. The mPVDF containing internal double bonds is susceptible to interfacial melt-grafting initiated by DCP during dynamic vulcanization process.…”

“…First, PVDF were chemically modified by introducing reactive double bonds via alkali treatment according to the procedure previously reported. − Prior to the modification, 0.5 wt % KOH/isopropanol solution was pre-prepared. After completely dissolving 20 g of PVDF into 300 mL of DMAc under intensive magnetic stirring at 70 °C, 20 mL of KOH/isopropanol solution (0.5 wt %) was then added dropwise into the solution within 30 min, and the reaction lasted for 30 min under a N 2 atmosphere.…”

“…In this work, we used in situ interfacial reactive compatibilization for PVDF/SR systems, and successfully featured excellent mechanical performances, shape memory behavior, and recyclability in PVDF/SR TPVs containing a high mass ratio of SR. Considering the chemical inertness of PVDF, we first chemically modified PVDF via alkali treatment − to introduce reactive double bonds. Then, the double bonds can be easily activated by DCP to form SR-g-PVDF chains at the interface.…”

Reduction of liquid terminated-carboxyl fluoroelastomers using NaBH4/SmCl3

“…Low molecular weight LTCFs with M n ranging from 500 to 10 000 were prepared by oxidative degradation of uoroelastomers. 6,7 However, due to the properties of carboxyl groups, the LTCFs are difficult to react with cross-linking agents at low temperature and have low heat resistance stability, 8 which will inevitably affect their comprehensive properties and limit their application elds. Therefore, it is particularly important to convert the carboxyl groups into hydroxyl groups to improve the thermal stability and reduce the curing temperature of liquid uoroelastomers.…”