Hydrogen bonding interactions in poly(ε-caprolactone–dimethyl siloxane–ε-caprolactone)/poly(hydroxyether of bisphenol A) triblock copolymer/homopolymer blends and the effect on crystallization, microphase separation and self-assembly

Salim, Nisa V.; Fox, Bronwyn; Hanley, Tracey

doi:10.1016/j.eurpolymj.2015.03.046

Cited by 7 publications

(3 citation statements)

References 37 publications

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“…Recent researches have realized the fabrication of sub‐10 nm microstructures by supramolecular interactions such as coordination bond, ionic bond, hydrogen bond, halogen bond. As one typical example, poly(4‐vinyl pyridine) (P4VP) often serves as polymer matrix to interact with various functional dopants, and these supramolecular interactions significantly influence the self‐organization process so as to change their phase components as well as the nanostructures . However, there are seldom reports on fabrication of sub‐10 nm microstructures through self‐assembly of BCs containing hydrogen bonding interactions themselves without doping any additives.…”

Section: Introductionmentioning

confidence: 99%

Hydrogen Bond Induces Hierarchical Self‐Assembly in Liquid‐Crystalline Block Copolymers

Huang

Pang

Chen

et al. 2018

Macromol. Rapid Commun.

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Microphase-separated structures of block copolymers (BCs) with a size of sub-10 nm are usually obtained by hydrogen-bond-induced self-assembly of BCs through doping with small molecules as functional additives. Here, fabrication of hierarchically self-assembled sub-10 nm structures upon microphase separation of amphiphilic liquid-crystalline BCs (LCBCs) at the existence of hydrogen bonds but without any dopants is reported. The newly introduced urethane groups in the side chain of the hydrophobic block of LCBCs interact with the ether groups of the hydrophilic poly(ethylene oxide) (PEO) block, leading to imperfect crystallization of the PEO blocks. Both crystalline and amorphous domains coexist in the separated PEO phase, enabling a lamellar structure to appear inside the PEO nanocylinders. This provides an elegant method to fabricate controllable sub-10 nm microstructures in well-defined polymer systems without the introduction of any dopants.

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Section: Introductionmentioning

confidence: 99%

Hydrogen Bond Induces Hierarchical Self‐Assembly in Liquid‐Crystalline Block Copolymers

Huang

Pang

Chen

et al. 2018

Macromol. Rapid Commun.

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“…Epoxy thermoset resins attracted significant interest because of their excellent properties and found various applications. , Epoxy thermosets, because of their inherent brittle nature and fast crack propagation rate, show poor fracture toughness and fatigue performance which limit their use in industrial applications. − One of the efficient ways to overcome this problem and to improve the impact strength of brittle epoxy is the blending with liquid rubbers, especially with carboxyl-terminated poly(butadiene- co -acrylonitrile) (CTBN). − It has been reported that through the inclusion of carboxyl-terminated CTBN rubber, the impact strength of epoxy increases significantly, but a drop in tensile strength and thermal property are also recorded. The addition of a rigid nanofiller along with carboxyl-terminated CTBN can compensate the loss in stiffness without reducing toughness of the epoxy thermoset.…”

Section: Introductionmentioning

confidence: 99%

Enhancement of Adhesive Strength of Epoxy/Carboxyl-Terminated Poly(butadiene-co-acrylonitrile) Nanocomposites Using Waste Hemp Fiber-Derived Cellulose Nanofibers

Padinjakkara

Scarinzi

Santagata

et al. 2020

Ind. Eng. Chem. Res.

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In this study, a novel extraction method has been employed to obtain highly efficient cellulose nanocrystals (CNCs) and cellulose nanofibers (CNFs) from waste hemp fibers with maximum potential. By applying alkali and bleaching treatment methods, the eradication of hemicelluloses and lignin with purified cellulose was achieved. Morphological studies confirmed that the purification and isolation of cellulose as a network of nanofibers were achieved. as the as-prepared CNFs were employed as the economic and environment-friendly candidate for reinforcing epoxy-carboxyl-terminated poly(butadiene-co-acrylonitrile) (CTBN) blend, for the first time. The adhesive strength of the epoxy/CTBN blend enhanced significantly (34%) with the incorporation of 0.5 phr of CNFs. The study has confirmed that on addition of a very small concentration of CNFs (0.25 phr) in the epoxy/CTBN thermosets, thermal stability, storage modulus, tensile shear adhesive, and impact strengths of epoxy/CTBN blend improved because of the excellent properties of the CNF. The adhesive strength of the epoxy/CTBN blend enhanced from 2.67 ± 0.19 MPa to 3.34 ± 0.06 and 3.59 ± 0.12 through the incorporation of 0.25 and 0.5 phr CNF, respectively.

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“…The CDSA of different BCPs with crystalline blocks such as poly(ε‐caprolactone) (PCL), poly( l ‐lactide) (PLLA), polyferrocenyldimethylsilane (PFDMS), and poly(3‐hexylthiophene) (P3HT) are widely reported. Meanwhile, many methods are adopted to manipulate the crystalline morphologies such as temperature, stereocomplexation, and additives . However, most of the works related to the regulation of crystalline micelles are mainly focused on the core‐forming blocks, while the effort devoted to corona segments is rare.…”

Section: Introductionmentioning

confidence: 99%

Disassembly of Crystalline Platelets of an Amphiphilic Triblock Copolymer Mediated by Varying pH and Organic Diacids

Luo

Lin

Tang

et al. 2019

Macro Chemistry & Physics

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Regulation of crystalline micelles is difficult to achieve because of the strong solidification of crystallization. In this present work, an amphiphilic triblock copolymer poly(ethylene oxide)‐b‐poly(ε‐caprolactone)‐b‐poly(4‐vinylpyridine) (PEO‐b‐PCL‐b‐P4VP) is prepared, in which the P4VP block serves as an H‐bonding acceptor. It is originally self‐assembled into crystalline lamellar micelles in aqueous solution. Subsequently, the effect of varying pH and organic diacids on morphological transition is investigated in detail. Lamellae‐to‐cylinder‐to‐sphere transitions are observed after decreasing the pH or with the addition of organic diacids with different chain spacers. The decreasing pH causes increasing hydrophilicity of the P4VP block, while adding organic diacids results in an increasing corona swelling of the P4VP segment, both of which lead to a decreasing crystallinity of the poly(ε‐caprolactone) core. Consequently, morphological variety changing from lamellar to worm‐like to spherical micelles can be achieved.

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Hydrogen bonding interactions in poly(ε-caprolactone–dimethyl siloxane–ε-caprolactone)/poly(hydroxyether of bisphenol A) triblock copolymer/homopolymer blends and the effect on crystallization, microphase separation and self-assembly

Cited by 7 publications

References 37 publications

Hydrogen Bond Induces Hierarchical Self‐Assembly in Liquid‐Crystalline Block Copolymers

Hydrogen Bond Induces Hierarchical Self‐Assembly in Liquid‐Crystalline Block Copolymers

Enhancement of Adhesive Strength of Epoxy/Carboxyl-Terminated Poly(butadiene-co-acrylonitrile) Nanocomposites Using Waste Hemp Fiber-Derived Cellulose Nanofibers

Disassembly of Crystalline Platelets of an Amphiphilic Triblock Copolymer Mediated by Varying pH and Organic Diacids

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