Physical and Rheological Properties of Maleic Anhydride-Incorporated PVDF: Does MAH Act as a Physical Crosslinking Point for PVDF Molecular Chains?

Abstract

The miscibility and physical and rheological properties of binary poly(vinylidene fluoride)/maleic anhydride (PVDF/MAH) blends have been systematically investigated. MAH was found to be miscible with PVDF by scanning electron microscopy (SEM), differential scanning calorimetry (DSC), and dynamic mechanical analysis (DMA). Fourier transform infrared (FTIR) investigations provided positive evidence for the specific interaction between the carbonyl groups of MAH and the methylene groups of PVDF. Rheological measurements showed that both the storage modulus and the melt viscosity of PVDF increase with the addition of MAH, followed by a decrease with excess MAH. In addition, the elongation of the PVDF/MAH blend with 10 wt % MAH is 589.7%, which is almost 5 times that of neat PVDF. It is concluded that MAH small molecules act as physical “crosslinking” points for the neighboring PVDF molecule chains due to this specific interaction between PVDF and MAH. Such a physical crosslinking function enhances the storage modulus, viscosity, and mechanical properties of PVDF.

Functionalized Fluoropolymer-Compatibilized Elastomeric Bilayer Composites for Osteochondral Repair: Unraveling the Role of Substrate Stiffness and Functionalities

“…The decrease in melting temperature of the semicrystalline component suggests the plausible macromolecular interaction between the amorphous phases in the blend . The plasticizing effect of maleic anhydride functionalization in the m-PVDF- and TPU-based blends might be the reason for the decrease in the crystallization temperature . Furthermore, the lowered crystallization temperature also indicates the delay in the crystallization process of m-PVDF-based blends.…”

“…A delayed crystallization of m-PVDF- and TPU-based compatibilized blends with a decrease in the melting temperature and enthalpy of fusion indicates the interaction of the amorphous phases of both components (Table ). , The homogeneous blend of m-PVDF/TPU might be due to the chemical interaction between the electronegative oxygen present in the maleic anhydride group of m-PVDF and the hydrogen of the NH group in TPU. It is interesting that the noncovalent interaction such as hydrogen bonding greatly enhances the mechanical property of the maleic anhydride-grafted PVDF blend compared to the unfunctionalized PVDF blend.…”

Studies of the effect of temperature on charge accumulation in PVDF-PMMA double-layered thin films based on depolarization current measurements

“…33 The low temperature in PVDF is related to the local motions of the frozen in main chains in the amorphous region of semi-crystalline polymer and the high-temperature peak is associated with molecular motions in amorphous-crystalline boundaries. 34,35 In air-gap TSDC, the charge carriers are not in the position to join with the image charges at the adjoining electrode due to blocking of the electrode by the adjacent air-gap. This blocking results to transfer charge carriers toward the other electrode through the bulk of the sample.…”

Tuning of shear thickening behavior and elastic strength of polyvinylidene fluoride via doping of ZnO‐graphene

“…On the other hand, bands observed at 473, 510, and 840 cm −1 are assigned to the electroactive β‐phase of PVDF. The presence of polar bands in pure PVDF is attributed to the crystallization from the mixed solvent system leading to dipolar interactions between solvent molecules and the PVDF chain 36,48,49 . However, the bands at 510 and 840 cm −1 are not exclusively come from β‐phase, but from mixed vibrations of β + γ phases.…”

“…As far as the PVDF is concerned, mostly the melt rheology of pure PVDF and PVDF based nanocomposite has been done and reported in the literature. In melt rheology, PVDF and PVDF based polymer nanocomposites show the shear thinning fluid behavior 36,37 . Considering all these studies and application perspectives in view, in this context we made an attempt to explore the rheological study of pure PVDF and PVDF based PNCs at room temperature.…”