Asynchronous fracture of hierarchical microstructures in hard domain of thermoplastic polyurethane elastomer: Effect of chain extender

Guo, Yu; Zhang, Ruoyu; Xiao, Qiang; Guo, Hongxia; Wang, Zongbao; Li, Xing; Chen, Jing; Zhu, Jin

doi:10.1016/j.polymer.2018.01.035

Cited by 64 publications

(34 citation statements)

References 41 publications

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“…On the other hand, different polyols can be used to obtain PU such as: polyesters, polyester polyols, polycaprolactones, polycarbonates and polyethers [72]. Finally, there is an alternative type of compound added during PU synthesis that changes the final properties of the material: chain extenders [72,74]. These molecules are normally short-chain diols such as 1,4-butanediol.…”

Section: Polymers Used For Implantable Polymeric Drug Delivery Devmentioning

confidence: 99%

Implantable Polymeric Drug Delivery Devices: Classification, Manufacture, Materials, and Clinical Applications

et al. 2018

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The oral route is a popular and convenient means of drug delivery. However, despite its advantages, it also has challenges. Many drugs are not suitable for oral delivery due to: first pass metabolism; less than ideal properties; and side-effects of treatment. Additionally, oral delivery relies heavily on patient compliance. Implantable drug delivery devices are an alternative system that can achieve effective delivery with lower drug concentrations, and as a result, minimise side-effects whilst increasing patient compliance. This article gives an overview of classification of these drug delivery devices; the mechanism of drug release; the materials used for manufacture; the various methods of manufacture; and examples of clinical applications of implantable drug delivery devices.

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Section: Polymers Used For Implantable Polymeric Drug Delivery Devmentioning

confidence: 99%

Implantable Polymeric Drug Delivery Devices: Classification, Manufacture, Materials, and Clinical Applications

et al. 2018

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“…14,15 Studies have discussed factors causing microphase separation in PU, such as hydrogen bonds (HBs) 16,17 and the ratio of so and hard segments. 18,19 Thermoplastic PU exhibits high strength, toughness, and wearability, and has properties of both plastics and elastomers; 20,21 thus it can be used in various industries. Accordingly, the present study focused on biodegradable PU.…”

Section: Introductionmentioning

confidence: 99%

Properties and degradation of castor oil-based fluoridated biopolyurethanes with different lengths of fluorinated segments

Cheng

Lee

et al. 2019

RSC Adv.

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“…As for the -C=O groups of WS2/PU ( Fig. 2f) composites, it is noted that the bands intensity of the hydrogen bonded -C=O group keep decreases in the whole heating process, but the peak intensity of free -C=O group around 1731 cm -1 is increased 50,51 . These results indicate the breakage of various hydrogen bonds of related groups which generates "free" -C=O groups.…”

Section: Resultsmentioning

confidence: 88%

Ultrarobust, tough and highly stretchable self-healing materials based on cartilage-inspired noncovalent assembly nanostructure

Wang

Huang

Zhang

2020

Preprint

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Self-healing materials integrated with robust mechanical strength and high healing efficiency simultaneously would be of great use in many fields but have been proven to be extremely challenging. Here, inspired by animal cartilage, we present a ultrarobust self-healing material by incorporating high density noncovalent bonds at interface between the assembled interwoven network of two-dimensional nanosheets and polymer matrix to collectively produce a strong interfacial interaction. The resulted nanocomposite material shows robust tensile strength (52.3 MPa), high toughness (282.7 MJ m–3, which is 1.6 times higher than spider silk and 9.4 times higher than metallic aluminum), high stretchability (1020.8%) and excellent healing efficiency (80-100%), which overturns previous understanding of the traditional noncovalent bonding self-healing materials that high mechanical robustness and healing ability tend to be mutually exclusive. Moreover, the interfacical supramolecular crosslinking structure enables the functional-healing ability of the resultant flexible devices. This work opens an avenue toward the development of ultrarobust self-healing materials for various flexible functional devices.

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Asynchronous fracture of hierarchical microstructures in hard domain of thermoplastic polyurethane elastomer: Effect of chain extender

Cited by 64 publications

References 41 publications

Implantable Polymeric Drug Delivery Devices: Classification, Manufacture, Materials, and Clinical Applications

Implantable Polymeric Drug Delivery Devices: Classification, Manufacture, Materials, and Clinical Applications

Properties and degradation of castor oil-based fluoridated biopolyurethanes with different lengths of fluorinated segments

Ultrarobust, tough and highly stretchable self-healing materials based on cartilage-inspired noncovalent assembly nanostructure

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