The study of microstructures of poly(vinyl alcohol) by NMR

Amiya, Shigetoshi; Tsuchiya, Shizuo; Qian, Renyuan; Nakajima, Akira

doi:10.1351/pac199062112139

Cited by 23 publications

(13 citation statements)

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“…This is fully consistent with results from NMR for the PVA region in 1 H and 13 C spectra of HTMA-PFP:hPVA 1:4 solutions in D 2 O. The spectra (see Figure S1, Supporting Information) are in excellent agreement with literature spectra for PVA 75 and are not affected by the presence of HTMA-PFP.…”

Section: ■ Experimental Sectionsupporting

confidence: 89%

Incorporation of a Cationic Conjugated Polyelectrolyte CPE within an Aqueous Poly(vinyl alcohol) Sol

et al. 2016

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We report on a multiscale polymer-within-polymer structure of the cationic conjugated polyelectrolyte poly{[9,9-bis(6′-N,N,N-trimethylammonium)hexyl]fluorene−phenylene} (HTMA-PFP) in aqueous poly(vinyl alcohol) (PVA) sol. Molecular dynamics simulations and small-angle neutron scattering (SANS) data show that HTMA-PFP forms aggregates in water but becomes entangled by PVA (with a 1:1 molar ratio of HTMA-PFP to PVA) and eventually immersed in PVA clusters (with the ratio 1:4). This is attributed to the hydrophobic−hydrophilic balance. Contrast variation data with regular and deuterated PVA support a rigid body model, where HTMA-PFP is confined as locally isolated, but closely located, chains within PVA clusters, which alter correlation distances within the system. These results are supported by enhanced photoluminescence (PL) and ionic conductivity which, together with a red-shift in UV/vis absorption spectra, indicate the breakup of HTMA-PFP aggregates upon PVA addition.

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Section: ■ Experimental Sectionsupporting

confidence: 89%

Incorporation of a Cationic Conjugated Polyelectrolyte CPE within an Aqueous Poly(vinyl alcohol) Sol

et al. 2016

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“…Expanded regions (60−69 ppm) of the 13 C NMR spectra of PVF-HET c, PVF-PREC c, PVA, and PVF-SOL are shown in Figure . Assignments of PVA methine resonances are based on previous reports concerning the stereoregularity of atactic PVA. ,,, Resonances 68.2−67.6, 66.7−65.9, and 64.7−64.1 ppm are typical patterns for hydroxyl functions with two hydroxyl neighbors, i.e., a VVV sequence corresponding with PVA monomer sequences in terms of triad tacticity. These resonances correspond respectively to V m VV m , V m VV r , and V r VV r sequences.…”

Section: Resultsmentioning

confidence: 99%

H and¹³C NMR Spectroscopy as a Tool To Probe the Microstructures of Different Types of Poly(vinyl formal)

Pollers¹,

Adriaensens²,

Carleer³

et al. 1996

Macromolecules

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1H and 13C NMR spectroscopy has been used to analyze the stereosequence and the comonomer sequence microstructure in poly(vinyl formal) (PVF). The preparation method employed clearly has an effect on the functional group distribution. The results reveal that the heterogeneous modification method shows evidence for a blocky distribution of functional groups whereas samples prepared by the precipitation method exhibit a random distribution.

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“…A commercially available poly(vinyl alcohol) sample (from Aldrich, average M w is 124 000 -186 000) was used in this study. 1 H NMR indicates that this PVA sample is a sterically random polymer 14) . PVA was dissolved in 0.2 M NaCl aqueous solution to a concentration of 1 mg/ml.…”

Section: Experimental Partmentioning

confidence: 90%

Single molecule force spectroscopy on poly(vinyl alcohol) by atomic force microscopy

Zhang

et al. 1998

Macromol. Rapid Commun.

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The elastic properties of poly(vinyl alcohol) (PVA) were investigated on the nanoscale using the new technique of single molecule force spectroscopy by atomic force microscopy (AFM). It was found that the elastic properties of PVA molecules scale linearly with their contour lengths. This finding corroborates that the deformation of individual PVA chains is measured. The force spectra of PVA show a kink at around 200 pN and cannot be fitted by an extended Langevin function. The deviation of the elastic behavior of PVA from a freely jointed chain model may indicate the presence of a suprastructure of PVA in NaCl solution.

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The study of microstructures of poly(vinyl alcohol) by NMR

Abstract: Abstract

Cited by 23 publications

References 1 publication

Incorporation of a Cationic Conjugated Polyelectrolyte CPE within an Aqueous Poly(vinyl alcohol) Sol

Incorporation of a Cationic Conjugated Polyelectrolyte CPE within an Aqueous Poly(vinyl alcohol) Sol

H and¹³C NMR Spectroscopy as a Tool To Probe the Microstructures of Different Types of Poly(vinyl formal)

Single molecule force spectroscopy on poly(vinyl alcohol) by atomic force microscopy

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The study of microstructures of poly(vinyl alcohol) by NMR

Abstract: Abstract

Cited by 23 publications

References 1 publication

Incorporation of a Cationic Conjugated Polyelectrolyte CPE within an Aqueous Poly(vinyl alcohol) Sol

Incorporation of a Cationic Conjugated Polyelectrolyte CPE within an Aqueous Poly(vinyl alcohol) Sol

H and 13C NMR Spectroscopy as a Tool To Probe the Microstructures of Different Types of Poly(vinyl formal)

Single molecule force spectroscopy on poly(vinyl alcohol) by atomic force microscopy

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Product

Resources

About

H and¹³C NMR Spectroscopy as a Tool To Probe the Microstructures of Different Types of Poly(vinyl formal)