scholarly journals Flexible Epoxy Resins Formed by Blending with the Diblock Copolymer PEO-b-PCL and Using a Hydrogen-Bonding Benzoxazine as the Curing Agent

Polymers ◽  
2019 ◽  
Vol 11 (2) ◽  
pp. 201 ◽  
Author(s):  
Wei-Chen Su ◽  
Fang-Chang Tsai ◽  
Chih-Feng Huang ◽  
Lizong Dai ◽  
Shiao-Wei Kuo
Keyword(s):  
Hydrogen Bonding ◽  
Diblock Copolymer ◽  
Mechanical Analysis ◽  
Intermolecular Hydrogen Bonding ◽  
Curing Agent ◽  
Thermal Curing ◽  
Scanning Calorimetry ◽  
Poly Ethylene Oxide ◽  
Poly Ethylene ◽  
Copolymer Poly

In this study, we enhanced the toughness of epoxy resin by blending it with the diblock copolymer poly(ethylene oxide–b–ε-caprolactone) (PEO-b-PCL) with a benzoxazine monomer (PA-OH) as the thermal curing agent. After thermal curing, Fourier transform infrared spectroscopy revealed that intermolecular hydrogen bonding existed between the OH units of the epoxy–benzoxazine copolymer and the C–O–C (C=O) units of the PEO (PCL) segment. Differential scanning calorimetry and dynamic mechanical analysis revealed that the glass transition temperature and storage modulus of the epoxy–benzoxazine matrix decreased significantly upon increasing the concentration of PEO-b-PCL. The Kwei equation predicted a positive value of q, consistent with intermolecular hydrogen bonding in this epoxy–benzoxazine/PEO-b-PCL blend system. Scanning electron microscopy revealed a wormlike structure with a high aspect ratio for PEO-b-PCL as the dispersed phase in the epoxy–benzoxazine matrix; this structure was responsible for the improved toughness.

scholarly journals Hierarchical Self-Assembled Structures from Diblock Copolymer Mixtures by Competitive Hydrogen Bonding Strength

Molecules ◽  
2018 ◽  
Vol 23 (9) ◽  
pp. 2242 ◽  
Author(s):  
Tzu-Chun Tseng ◽  
Shiao-Wei Kuo
Keyword(s):  
Hydrogen Bonding ◽  
Ethylene Oxide ◽  
Diblock Copolymer ◽  
Structure Transition ◽  
Reversible Addition ◽  
Poly Ethylene Oxide ◽  
Self Assembled ◽  
Poly Ethylene ◽  
Chain Transfer Polymerization ◽  
Hydrogen Bonding Strength

In this work we prepared poly(styrene–b–vinylphenol) (PS-b-PVPh) by sequential anionic living polymerization and poly(ethylene oxide-b-4-vinylpyridine) (PEO-b-P4VP) by reversible addition fragmentation chain transfer polymerization (RAFT) by using poly(ethylene oxide) 4-cyano-4-(phenylcarbonothioylthio)pentanoate (PEO-SC(S)Ph) as a macroinitiator with two hydrogen bonded acceptor groups. When blending with disordered PEO-b-P4VP diblock copolymer, we found the order-order self-assembled structure transition from lamellar structure for pure PS-b-PVPh to cylindrical, worm-like, and finally to PEO crystalline lamellar structures. Taking the advantage of the ΔK effect from competitive hydrogen bonding strengths between PVPh/P4VP and PVPh/PEO domains, it could form the hierarchical self-assembled morphologies such as core–shell cylindrical nanostructure.

Morphology of a Crystalline/Amorphous Diblock Copolymer:  Poly((ethylene oxide)-b-butadiene)

2001 ◽  
Vol 34 (20) ◽  
pp. 7009-7016 ◽  
Author(s):  
Sheng Hong ◽  
Lizhang Yang ◽  
William J. MacKnight ◽  
Samuel P. Gido
Keyword(s):  
Ethylene Oxide ◽  
Diblock Copolymer ◽  
Poly Ethylene Oxide ◽  
Poly Ethylene ◽  
Copolymer Poly

Effect of poly(ethylene oxide) molecular mass on miscibility and hydrogen bonding with lignin

Holzforschung ◽  
2006 ◽  
Vol 60 (3) ◽  
pp. 245-252 ◽  
Author(s):  
Satoshi Kubo ◽  
John F. Kadla
Keyword(s):  
Hydrogen Bonding ◽  
Ethylene Oxide ◽  
Molecular Mass ◽  
Weighted Average ◽  
Degree Of Crystallinity ◽  
Scanning Calorimetry ◽  
Band Shape ◽  
Poly Ethylene Oxide ◽  
Ft Ir ◽  
Poly Ethylene

Abstract The effect of the molecular mass of poly(ethylene oxide) (PEO) on lignin-PEO blends was studied using thermal analysis and FT-IR. Differential scanning calorimetry (DSC) analysis revealed miscible blends over the entire blend ratio. A negative deviation in T g from a simple weighted average was observed, indicating the existence of relatively weak favorable interactions between blend components. Analysis of the data revealed no difference in the magnitude or propensity of intermolecular interactions with increasing PEO molecular mass in the kraft lignin-PEO blends. By contrast, the fitting parameters obtained for organosolv lignin were substantially different; the higher molecular mass PEO had a higher propensity to form slightly stronger intermolecular inter-actions than the lower molecular mass PEO. Low molecular mass poly(ethylene glycol) dimethylether (M-PEG)-lignin blends had a much higher degree of crystallinity than the PEO blends, resulting in an increase in T g at high PEG content. FT-IR analysis revealed the presence of strong intermolecular hydrogen bonding between lignin and PEO. However, the band shape of the νOH region of the M-PEG blends was slightly different from the PEO blends; some of the original lignin inter- and intramolecular hydrogen bonding was still present in the M-PEG-lignin blends.

Molecular Dynamics Study of Polystyrene-b-poly(ethylene oxide) Asymmetric Diblock Copolymer Systems

Langmuir ◽  
2017 ◽  
Vol 33 (36) ◽  
pp. 8856-8868 ◽  
Author(s):  
M. Dobies ◽  
M. Makrocka-Rydzyk ◽  
J. Jenczyk ◽  
M. Jarek ◽  
R. J. Spontak ◽  
...  
Keyword(s):  
Molecular Dynamics ◽  
Ethylene Oxide ◽  
Diblock Copolymer ◽  
Poly Ethylene Oxide ◽  
Poly Ethylene

Preparation of Nanoporous Mondispersed Silica Nanoparticles Films Using Poly(styrene)- Block-Poly( 2-Vinyl Pyridine) as Template

2008 ◽  
Vol 47-50 ◽  
pp. 646-649
Author(s):  
Yang Yen Yu ◽  
Wen Chen Chien ◽  
Shih Ting Chen
Keyword(s):  
Hydrogen Bonding ◽  
Silica Nanoparticles ◽  
Colloidal Silica ◽  
Nanoporous Silica ◽  
Intermolecular Hydrogen Bonding ◽  
Pore Morphology ◽  
Silica Films ◽  
Nanoporous Films ◽  
Vinyl Pyridine ◽  
Copolymer Poly

Nanoporous silica films were prepared through the templating of amphiphilic block copolymer, poly(styrene-2-vinyl pyridine) (PS-b-P2VP), and colloidal silica nanoparticles. The experimental and theoretical studies suggested that the intermolecular hydrogen bonding was existed between the colloidal silica nanoparticles and PS-b-P2VP. The miscible hybrid and the narrow thermal decomposition of the PS-b-P2VP led to nanopores in the prepared films from the results of TGA, AFM, and TEM. The effects of the loading ratio and P2VP chain length on the morphology and properties of the prepared nanoporous silica films were investigated. The TEM and AFM studies showed that the uniform pore morphology with pore size 10-15nm was prepared from a modest porogen loading level for the optimum intermolecular hydrogen bonding. The refractive index and dielectric constant of the prepared nanoporous films decreased with an increase in PS-b-P2VP loading. On the other hand, the porosity increased with an increasing PS-b-P2VP loading. This study demonstrated a methodology to control pore morphology and properties of the nanoporous silica films through the templating of PS-b-P2VP.

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