Supramolecular polymer networks: hydrogels and bulk materials

Voorhaar, Lenny; Hoogenboom, Richard

doi:10.1039/c6cs00130k

Cited by 418 publications

(367 citation statements)

References 245 publications

(238 reference statements)

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“…[39][40][41] In a hydrogel crosslinked with HB polymers, polymeric chains have been held together by directionally discrete supramolecular binding sites to enhance the mechanical properties of the resultant composite. 42,43 Evidence has suggested the potential for using HB polymers as a reinforcement agent in PAA based hydrogels. 44,45 The aim of this study was to toughen PAA hydrogels with a combination of covalent and physical crosslinking by introducing HB polymers, without sacrificing the swelling ratio of the final product.…”

Section: à2mentioning

confidence: 99%

In situ polymerized hyperbranched polymer reinforced poly(acrylic acid) hydrogels

Dehbari

Tavakoli

Khatrao

et al. 2017

Mater. Chem. Front.

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a Hydrogels have been extensively investigated for use in various applications. Poly acrylic acid (PAA) is a common example, which has been widely used due to its super hydrophilicity properties, biocompatibility and biodegradability characteristics. However its poor mechanical properties, which have been addressed in many research studies, are known as a drawback that limits its applications. So, enhancing PAA mechanical properties using a hyperbranched polymer (HB) is the key question to be addressed in this research.Investigations of the mechanical properties of the PAA-HB hydrogel revealed 130% improvement in the ultimate tensile strength, indicating a two times enhancement compared to that of PAA. Statistical analysis showed that the overall effect of introducing notches (with different depths) on the selected mechanical properties of both PAA and PAA-HB was significant. Mechanical characterization of PAA-HB networks showed that significant improvement in the mechanical properties was achieved as the capability of water uptake increased by 20%. Characterization of the physical properties confirmed that participation of HB may form a PAA based hybrid material with good swelling properties. Those findings are attributed to the supramolecular structure of the HB, which can introduce physical entanglement between the PAA network structure and increase the crystallinity of the final hydrogel as compared to those from the PAA hydrogel.

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Section: à2mentioning

confidence: 99%

In situ polymerized hyperbranched polymer reinforced poly(acrylic acid) hydrogels

Dehbari

Tavakoli

Khatrao

et al. 2017

Mater. Chem. Front.

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“…In this type of self-healing materials, the healing mechanism is based on the reversible formation of weak chemical bonds of polymer chains including dynamic non-covalent bonds [15,16,34] and dynamic covalent bonds. [35][36][37][38][39][40][41] Upon damage, weak chemical bonds such as S-S bonds and hydrogen bonds were broken.…”

Section: Intrinsic Self-healing Polymers With Reversible Bondsmentioning

confidence: 99%

“…[9][10][11][12] It is hoped that the energy harvesting and storage devices with self-healing ability can repair cracks, breakages or mechanical damages once occur, so as to restore the original performances or minimize the property loss of the devices. [13][14][15][16][17] This will significantly enhance the durability and extend the lifetime of these devices, and reduce electronic waste and economic cost. [7,8] To date, most progress in self-healing materials focuses on the healing of mechanical and structural properties of the materials.…”

mentioning

confidence: 99%

Self‐Healing Materials for Next‐Generation Energy Harvesting and Storage Devices

Chen

Wang

Yang

et al. 2017

Advanced Energy Materials

228

174

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Because of the great breakthroughs of self‐healing materials in the past decade, endowing devices with self‐healing ability has emerged as a particularly promising route to effectively enhance the device durability and functionality. This article summarizes recent advances in self‐healing materials developed for energy harvesting and storage devices (e.g., nanogenerators, solar cells, supercapacitors, and lithium‐ion batteries) over the past decade. This review first introduces the main self‐healing mechanisms among different materials including insulators, electrical conductors, semiconductors, and ionic conductors. Then, the basic concepts, fabrication techniques, and healing performances of the newly developed self‐healing energy harvesting (nanogenerators and solar cells) and storage (supercapacitors and lithium‐ion batteries) devices are described in detail. Finally, the existing challenges and promising solutions of self‐healing materials and devices are discussed.

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“…The mixture was extracted with water (50 mL Â 3), saturated brine (50 mL Â 1). The organic layer was dried over anhydrous Na 2 SO 4 …”

Section: Synthesis Of G1-g6mentioning

confidence: 99%

Amphiphilic oligoamides as versatile, acid-responsive gelators

et al. 2017

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Six oligoamides with the same backbone but different side and end chains, G1-G6, were designed and synthesized. Screening the gelating abilities of these oligoamides revealed G2 as a versatile gelator capable of forming stable hydrogels as well as several organogels. From UV, fluorescence, NMR, and SEM studies, the formation of hydrogels is driven by hydrophobic forces and p-p stacking while the gelation of nonpolar organic solvents relies on hydrogen-bonding interactions. The hydrogel of G2 is able to encapsulate and release medicinally important polar substances into water with acidresponsiveness.

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Supramolecular polymer networks: hydrogels and bulk materials

Cited by 418 publications

References 245 publications

In situ polymerized hyperbranched polymer reinforced poly(acrylic acid) hydrogels

In situ polymerized hyperbranched polymer reinforced poly(acrylic acid) hydrogels

Self‐Healing Materials for Next‐Generation Energy Harvesting and Storage Devices

Amphiphilic oligoamides as versatile, acid-responsive gelators

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