scholarly journals Phase Transitions in Poly(vinylidene fluoride)/Polymethylene-Based Diblock Copolymers and Blends

Polymers ◽  
2021 ◽  
Vol 13 (15) ◽  
pp. 2442
Author(s):  
Nicolás María ◽  
Jon Maiz ◽  
Daniel E. Martínez-Tong ◽  
Angel Alegria ◽  
Fatimah Algarni ◽  
...  
Keyword(s):  
Diblock Copolymers ◽  
Vinylidene Fluoride ◽  
Polarized Light ◽  
Scanning Calorimetry ◽  
X Ray ◽  
Preparation Conditions ◽  
X Ray Scattering ◽  
Transmission Electron ◽  
Poly Vinylidene Fluoride ◽  
Ray Scattering

The crystallization and morphology of two linear diblock copolymers based on polymethylene (PM) and poly(vinylidene fluoride) (PVDF) with compositions PM23-b-PVDF77 and PM38-b-PVDF62 (where the subscripts indicate the relative compositions in wt%) were compared with blends of neat components with identical compositions. The samples were studied by SAXS (Small Angle X-ray Scattering), WAXS (Wide Angle X-ray Scattering), PLOM (Polarized Light Optical Microscopy), TEM (Transmission Electron Microscopy), DSC (Differential Scanning Calorimetry), BDS (broadband dielectric spectroscopy), and FTIR (Fourier Transform Infrared Spectroscopy). The results showed that the blends are immiscible, while the diblock copolymers are miscible in the melt state (or very weakly segregated). The PVDF component crystallization was studied in detail. It was found that the polymorphic structure of PVDF was a strong function of its environment. The number of polymorphs and their amount depended on whether it was on its own as a homopolymer, as a block component in the diblock copolymers or as an immiscible phase in the blends. The cooling rate in non-isothermal crystallization or the crystallization temperature in isothermal tests also induced different polymorphic compositions in the PVDF crystals. As a result, we were able to produce samples with exclusive ferroelectric phases at specific preparation conditions, while others with mixtures of paraelectric and ferroelectric phases.

Temperature-dependent small-angle x-ray scattering from poly(vinylidene fluoride)

1980 ◽  
Vol 51 (10) ◽  
pp. 5508 ◽  
Author(s):  
J. M. Schultz ◽  
J. S. Lin ◽  
R. W. Hendricks ◽  
R. R. Lagasse ◽  
R. G. Kepler
Keyword(s):  
Small Angle ◽  
Vinylidene Fluoride ◽  
Temperature Dependent ◽  
X Ray ◽  
X Ray Scattering ◽  
Poly Vinylidene Fluoride ◽  
Ray Scattering

Stretching induced phase separation in poly(vinylidene fluoride)/poly(butylene succinate) blends studied by in-situ X-ray scattering

Polymer ◽  
2014 ◽  
Vol 55 (10) ◽  
pp. 2588-2596 ◽  
Author(s):  
Guoming Liu ◽  
Konrad Schneider ◽  
Liuchun Zheng ◽  
Xiuqin Zhang ◽  
Chuncheng Li ◽  
...  
Keyword(s):  
Phase Separation ◽  
Vinylidene Fluoride ◽  
Butylene Succinate ◽  
X Ray ◽  
X Ray Scattering ◽  
Poly Vinylidene Fluoride ◽  
Ray Scattering

scholarly journals Quantitative Analysis of Semicrystalline Blends SAXS Data: Theoretical Modeling versus Linear Correlation Function

2010 ◽  
Vol 2010 ◽  
pp. 1-6 ◽  
Author(s):  
Mohamed Fatnassi ◽  
Fadhel Ben Cheikh Larbi ◽  
Jean Louis Halary
Keyword(s):  
Correlation Function ◽  
Vinylidene Fluoride ◽  
Theoretical Modeling ◽  
Scattering Data ◽  
Saxs Data ◽  
One Dimensional ◽  
X Ray ◽  
X Ray Scattering ◽  
Poly Vinylidene Fluoride ◽  
Ray Scattering

This paper compares the results yielded by two methods of small-angle X-ray scattering data analysis for semicrystalline polymer blends. The first method is based on the use of a theoretical modeling for isotropic samples and a subsequent curve fitting. The second one is a more familiar method, based on the calculation of the linear one-dimensional correlation function. The experimental material considered for this purpose deals with a series of semi-crystalline blends of poly(vinylidene fluoride) and poly(methyl methacrylate), with a PVDF content covering the range 50 wt%–100 wt%. The results obtained by both calculation methods are systematically confronted to the crystallinity degrees deduced from wide angle X-ray scattering patterns.

In-Situ Simultaneous Synchrotron Small- and Wide-Angle X-ray Scattering Measurement of Poly(vinylidene fluoride) Fibers under Deformation

2000 ◽  
Vol 33 (5) ◽  
pp. 1765-1777 ◽  
Author(s):  
Jing Wu ◽  
Jerold M. Schultz ◽  
Fengji Yeh ◽  
Benjamin S. Hsiao ◽  
Benjamin Chu
Keyword(s):  
Vinylidene Fluoride ◽  
Wide Angle ◽  
X Ray ◽  
X Ray Scattering ◽  
Poly Vinylidene Fluoride ◽  
Scattering Measurement ◽  
Ray Scattering

Studying the Microstructure of Unaged and Aged PVDF by Small- and Wide-Angle X-ray Scattering

1997 ◽  
Vol 30 (5) ◽  
pp. 722-726 ◽  
Author(s):  
N. Stribeck ◽  
S. Buchner
Keyword(s):  
Vinylidene Fluoride ◽  
Thickness Distribution ◽  
Quantitative Description ◽  
Wide Angle ◽  
Aged Material ◽  
X Ray ◽  
Saxs Measurement ◽  
X Ray Scattering ◽  
Poly Vinylidene Fluoride ◽  
Ray Scattering

A layer from plasticized poly(vinylidene fluoride) (PVDF) was aged by exposing one of its faces to an aggressive fluid at elevated temperature and pressure. From visual inspection the aged material appeared not to be homogeneous. Therefore, samples from three distinguishable regions were compared with a sample cut from the virgin material by studying their small- and wide-angle X-ray scattering (SAXS and WAXS). The results show that plasticizer has vanished from the aged material, the crystalline layer thickness distribution has narrowed, amorphous lamellae are collapsed and voids have been created. Within the aged material the number of voids varies: there are more at the inner surface and fewer at the outer surface beneath the rods of a supporting metal grid. Based on the results of this study and theoretical considerations, a method for the quantitative description of the ageing process is proposed, which only requires a simple kind of SAXS measurement.

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