Hydrogen Bonding in Polymeric Materials

Kuo, Shiao‐Wei

doi:10.1002/9783527804276

Cited by 41 publications

(68 citation statements)

References 37 publications

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“…On the other hand, the fractions of intermolecular hydrogen bonds in PVPh-P and PVPh-E were higher, at 52.8% and 53.0%, respectively, following thermal treatment (180°C for 8 h), while theγ values of PVPh-P and PVPh-E were higher, at 29.9 and 28.7mJ/m 2 , respectively. The strengths of the intra-or and intermolecular hydrogen bonds and the nanometric structures of the polymer thin films are also strongly dependent on what kinds of solvents are used during the coating process as discussed in detail in our previous studies [7,[22][23][24][25][26][27]. For example, in PVPh blending with P4VP, we found that this mixture in good solvent displays separation coil behavior; but it displays complex aggregation in poor solvent [7,22,23].…”

Section: Temp ( • C)mentioning

confidence: 69%

Tuning the Wettability and Surface Free Energy of Poly(vinylphenol) Thin Films by Modulating Hydrogen-Bonding Interactions

et al. 2020

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The ability to tune the surface properties of a polymer film in a simple and effective manner is important for diverse biological, industrial, and environmental applications. In this work, we investigated whether or not the surface free energy of poly(vinyl phenol; PVPh) can be tuned by adjusting the casting solvent and the thermal treatment time, which alters the proportions of intra-and intermolecular hydrogen bonding interactions. Compared to the untreated sample, in tetrahydrofuran (THF) system, the thermal treatment resulted in a lower proportion of intermolecular hydrogen bonds and a concomitant decrease in the surface free energy (from 39.3 to 18.8 mJ/m2). In contrast, the thermal treatment in propylene glycol methyl ether acetate (PGMEA) and ethyl-3-ethoxypropionate (EEP) systems increased the proportion of intermolecular hydrogen bonds and the surface free energy of the polymer thin films, from 45.0 to 54.3 mJ/m2 for PGMEA and from 45.5 to 52.9 mJ/m2 for EEP. Controlling intermolecular hydrogen-bonding interactions is a unique and easy method for tuning the surface free energies of polymer substances.

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Section: Temp ( • C)mentioning

confidence: 69%

Tuning the Wettability and Surface Free Energy of Poly(vinylphenol) Thin Films by Modulating Hydrogen-Bonding Interactions

et al. 2020

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“…The strong intramolecular CH ··· OC hydrogen bonding in the PLA segment resulted in the lower hydrogen bonded acceptor ability ( K A < 10). [ 33 ] Furthermore, a band near 1100 cm −1 characterized the intermolecular hydrogen bonding in the phenolic/PEO domains. Figure 1c presents the FTIR spectral range containing the signal for the ether absorptions of the phenolic/PEO‐ b ‐PLA blends.…”

Section: Resultsmentioning

confidence: 99%

“…From a consideration of potential monomers for ROP that would provide weakly hydrogen bonding acceptor units, l ‐lactide (LLA) appeared to be a promising candidate for use in the template because the K A value for phenolic/PLLA blend is <10. [ 33 ] Nevertheless, the crystallization behavior of PEO‐ b ‐PLLA copolymers used as the template would strongly affect the resulting self‐assembled mesostructures because the free energy of crystallization is generally lower than microphase separation process; accordingly, lamellar structures have generally been observed from the PLLA crystallization. [ 34 ] Fortunately, crystalline PLLA segments can readily be changed into amorphous PLA segments when incorporating an equal number of D ‐ and L ‐forms in which the overall PLA segment is not chiral.…”

Section: Introductionmentioning

confidence: 99%

Varying the Hydrogen Bonding Strength in Phenolic/PEO‐b‐PLA Blends Provides Mesoporous Carbons Having Large Accessible Pores Suitable for Energy Storage

Lee

Ahmed

et al. 2020

Macro Chemistry & Physics

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as efficient electron transfer media to improve the performance of electric double-layer capacitors (EDLCs). [9] Furthermore, the blending of a self-assembled block copolymer with the carbon source (e.g., phenolic resin) is becoming more widespread. This method has the advantage of providing well-ordered mesoporous structures that can be used efficiently in various applications. [10,11] Typically, a block copolymer that forms a self-assembled structure is mixed with a carbon source to obtain various dimensional carbon structures. The blending of a commercial Pluronic-type triblock copolymer, such as poly(ethylene oxide-b-propylene oxideb-ethylene oxide), as the template is the method used most widely to prepare mesoporous materials. [12][13][14][15][16][17][18][19] Because of limitations in molecular weight and composition, it can, however, be difficult to prepare mesoporous materials having pore sizes of greater than 10 nm when using Pluronic-type triblock copolymers. Block copolymers featuring long hydrophobic segments and high molecular weight-for instance, poly(ethylene oxideb-styrene) (PEO-b-PS) [20,21] and poly(ethylene oxide-b-methyl methacrylate) (PEO-b-PMMA) [22] -are promising candidates as templates to prepare large-pore-size mesoporous carbons. For example, Zhao et al. prepared mesoporous carbons with long-range order, large surface areas (>1500 m 2 g −1 ), and large pores (≈23 nm) when using PEO 125 -b-PS 230 as the template as displayed in Scheme S1a-c in the Supporting Information. [21] With PEO 125 -b-PMMA 114 as the template, they obtained mesoporous carbons having large surface areas (>1500 m 2 g −1 ) and pores (≈10 nm) [22] when applying resol as the carbon source. Mesoporous carbons with smaller pores but thicker walls were obtained when using PEO-b-PMMA as the template, rather than PEO-b-PS, because the phenolic OH units could interact strongly with the PEO segment (interassociation equilibrium constant (K A ) = 286) [23] and weakly with the PMMA CO units (K A = 20) [24,25] through hydrogen bonding, but not with the hydrophobic PS segment. Indeed, the PS block segment would undergo complete microphase In this study, mesoporous carbons are prepared by using a resol-type phenolic resin as the carbon source and poly(ethylene oxide-b-lactic acid) (PEO-b-PLA) copolymer as the template, with a process of thermal curing, calcination, carbonization, and activation. The structures of these mesoporous carbons are strongly influenced by the self-assembled structures formed from phenolic/PEO-b-PLA blends, varying from double-gyroid, to cylinder, and finally to spherical micelle structures upon increasing the phenolic concentrations. The large pores (>20 nm) and high surface areas (>1000 m 2 g −1 ) of these activated mesoporous carbons arise because the phenolic resin interacts only with the PEO segment (i.e., not with the PLA segment) through hydrogen bonding; thus, the relative wall thickness of the phenolic matrix decreases after template removal (thereby increasing the pore size), similar to the beha...

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“…Overall, we could conclude that the PS- b -PVPh/PEO blends also display the wet-brush behavior where K A = 280 of PVPh/PEO is stronger than the K B = 66.8 of PVPh, which is consistent with our previous proposed scheme. However, it did not display a full order-order morphological transition, probably because of the relatively weaker intermolecular hydrogen bonding strength as compared with strong PVPh/P4VP blend system ( K A = 1200) [ 11 , 12 , 13 , 42 , 43 , 44 , 45 ].…”

Section: Resultsmentioning

confidence: 99%

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

Tseng

Kuo

2018

Molecules

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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.

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Hydrogen Bonding in Polymeric Materials

Cited by 41 publications

References 37 publications

Tuning the Wettability and Surface Free Energy of Poly(vinylphenol) Thin Films by Modulating Hydrogen-Bonding Interactions

Tuning the Wettability and Surface Free Energy of Poly(vinylphenol) Thin Films by Modulating Hydrogen-Bonding Interactions

Varying the Hydrogen Bonding Strength in Phenolic/PEO‐b‐PLA Blends Provides Mesoporous Carbons Having Large Accessible Pores Suitable for Energy Storage

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

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