Biobased thiol-epoxy shape memory networks from gallic acid and vegetable oils

Feng, Yajuan; Hu, Yang; Man, Limin; Yuan, Teng; Zhang, Chaoqun

doi:10.1016/j.eurpolymj.2018.10.025

Cited by 40 publications

(28 citation statements)

References 28 publications

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“…In order to ensure the grafting of relevant functional groups onto the MWCNTs after acidification and epoxidation, FT‐IR was used to detect any changes in the MWCNTs. As shown in Figure 3B, compared with the relatively flat infrared spectrum of pure MWCNTs (Figure 3C), more obvious absorption peaks appeared on the infrared curve of the MWCNTs after undergoing concentrated sulfuric acid oxidation treatment, such as the stretching vibration peak of OH at 3424 cm −1 , CO at 1740 cm −1 ,and COO at 1582 cm −1 17,25 . The appearance of these characteristic peaks indicated that the carboxyl group was grafted onto the MWCNTs' surface after acidification.…”

Section: Resultsmentioning

confidence: 91%

“…As shown in Figure 3B, compared with the relatively flat infrared spectrum of pure MWCNTs ( Figure 3C), more obvious absorption peaks appeared on the infrared curve of the MWCNTs after undergoing concentrated sulfuric acid oxidation treatment, such as the stretching vibration peak of OH at 3424 cm −1 , C O at 1740 cm −1 ,and COO at 1582 cm −1 . 17,25 The appearance of these characteristic peaks indicated that the carboxyl group was grafted onto the MWCNTs' surface after acidification. Figure 3A shows that the characteristic absorption peak of the epoxy group appeared at 908 cm −1 , suggesting that the outer wall of the MWCNTs has been grafted with epoxy groups after epoxidation.…”

Section: Characterization Analysismentioning

confidence: 99%

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Preparation of modified multi‐walled carbon nanotubes as a reinforcement for epoxy shape‐memory polymer composites

Wang

Tang

et al. 2020

Polymers for Advanced Techs

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Effectively improving the mechanical properties and thermal resistance of epoxy shape-memory polymers (ESMPs) without affecting their shape-memory performance is necessary to expand these polymers in practical applications. In this article, modified multi-walled carbon nanotubes (MWCNTs) were prepared and used as efficient reinforcement for enhancing the comprehensive properties of ESMPs. Increases of nearly 289% to 444% for impact strength and 112% to 184% for tensile force were obtained by adding only 0.1 to 1 wt% epoxy-modified MWCNTs. The addition of unmodified and carboxyl-modified MWCNTs was also investigated but showed less impact on the mechanical properties of the ESMPs than epoxy-modified MWCNTs. Thermogravimetry analysis (TGA) and dynamic mechanical analyses (DMA) showed that less than 1 wt% modified MWCNTs can enhance the heat resistance of ESMPs greatly. Although the shape recovery time for composite materials increased upon adding the MWCNTs, the entire recovery time was still less than 1 minute, and the shape recovery rate was relatively high, nearly 100%.

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Section: Resultsmentioning

confidence: 91%

Section: Characterization Analysismentioning

confidence: 99%

Preparation of modified multi‐walled carbon nanotubes as a reinforcement for epoxy shape‐memory polymer composites

Wang

Tang

et al. 2020

Polymers for Advanced Techs

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“…The changing trend of mechanical properties canbe explained by the inherent chemical composition and cross-linking density. In the cured systems, the increase in the grafting number resulted in an increase in the functionality of their structure, which was conducive to the formation of high cross-linking density and helped to increase the rigidity of the cured films, thereby enhancing the mechanical properties of the cured films [39,40]. In addition, the characteristics of different vegetable oil-based UV-cured films were compared.…”

Section: Mechanical Propertiesmentioning

confidence: 99%

One-Step Synthesis of Novel Renewable Vegetable Oil-Based Acrylate Prepolymers and Their Application in UV-Curable Coatings

Lin

Zhang

et al. 2020

Polymers

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With the rapid development of social economy, problems such as volatile organic compound (VOC) pollution and the excessive consumption of global petroleum resources have become increasingly prominent. People are beginning to realize that these problems not only affect the ecological environment, but also hinder the development of the organic polymer material industry based on raw fossil materials. Therefore, the modification and application of bio-based materials are of theoretical and practical significance. In this study, a series of vegetable oil-based acrylate prepolymers were synthesized by one-step acrylation using palm oil, olive oil, peanut oil, rapeseed oil, corn oil, canola oil, and grapeseed oil as raw materials, and the effect of different double bond contents on the product structure and grafting rate was investigated. Furthermore, the as-prepared vegetable oil-based acrylate prepolymers, polyurethane acrylate (PUA-2665), trimethylolpropane triacrylate (TMPTA), and photoinitiator (PI-1173) were mixed thoroughly to prepare ultraviolet (UV)-curable films. The effect of different grafting numbers on the properties of these films was investigated. The results showed that as the degree of unsaturation increased, the acrylate grafting number and the cross-linking density increased, although the acrylation (grafting reaction) rate decreased. The reason was mainly because increasing the double bond content could accelerate the reaction rate, while the grafted acrylic groups had a steric hindrance effect to prevent the adjacent double bonds from participating in the reaction. Furthermore, the increase in grafting number brought about the increase in the structural functionality of prepolymers and the cross-linking density of cured films, which led to the enhancement in the thermal (glass transition temperature) and mechanical (tensile strength, Young’s modulus) properties of the cured films.

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“…Thiol-epoxy curing based on renewable monomers like eugenol [70,71], phloroglucinol [72] or gallic acid [73] has also been recently reported. The thiol-epoxy reaction has been used in the preparation of polymer matrix in nanoclay [74] and boron nitride [75,76] composites.…”

Section: Preparation Of Thermosets By Nucleophilic Attack To Epoxy Rementioning

confidence: 99%

“…Thiol-epoxy curing based on renewable monomers like eugenol [70,71], phloroglucinol [72] or gallic acid [73] has also been recently reported.…”

Section: Preparation Of Thermosets By Michael Additionmentioning

confidence: 99%

The Use of Click-Type Reactions in the Preparation of Thermosets

et al. 2020

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Click chemistry has emerged as an effective polymerization method to obtain thermosets with enhanced properties for advanced applications. In this article, commonly used click reactions have been reviewed, highlighting their advantages in obtaining homogeneous polymer networks. The basic concepts necessary to understand network formation via click reactions, together with their main characteristics, are explained comprehensively. Some of the advanced applications of thermosets obtained by this methodology are also reviewed.

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Biobased thiol-epoxy shape memory networks from gallic acid and vegetable oils

Cited by 40 publications

References 28 publications

Preparation of modified multi‐walled carbon nanotubes as a reinforcement for epoxy shape‐memory polymer composites

Preparation of modified multi‐walled carbon nanotubes as a reinforcement for epoxy shape‐memory polymer composites

One-Step Synthesis of Novel Renewable Vegetable Oil-Based Acrylate Prepolymers and Their Application in UV-Curable Coatings

The Use of Click-Type Reactions in the Preparation of Thermosets

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