Shape memory materials based on adamantane-containing polyurethanes

Zou, Faxing; Chen, Heng; Fu, Shuqin

doi:10.1039/c8ra05111a

Cited by 16 publications

(5 citation statements)

References 37 publications

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“…From Table 2, it can be seen that the T d of all samples was around 303 °C, which was higher than the usual thermal degradation temperature of 250−260 °C for bio-based PUs. 38,39 This was attributed to the addition of rigid betulin, which led to an increase in the rigidity of the PU cross-linked network and improved thermal stability. However, the T d values did not increase significantly with the increase of betulin.…”

Section: ■ Methodsmentioning

confidence: 99%

Catalyst-Free Synthesis of Betulin-Based Polyurethane Elastomers with Outstanding Mechanical Properties and Solvent Resistance

Xu,

Ma,

Wang

et al. 2023

ACS Appl. Polym. Mater.

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Using sustainable biomass feedstock to prepare biobased chemical products is attracting increasing attention. Betulin is a natural cyclic aliphatic diol that can be extracted in large quantities from the bark of birch trees. In this study, a series of biobased polyurethane (PU) elastomers with excellent mechanical properties, solvent resistance, and thermal stability were synthesized under catalyst-free conditions using betulin and castor oil (CO) as the bio-based polyols. The chemical structure and properties of the bio-based PU elastomers were systematically investigated according to the effect of the hydroxyl ratio between betulin and CO. Due to the presence of abundant hydrogen bonds and rigid ring planes in the PU structure, and a higher cross-link density, the obtained PU elastomers had excellent mechanical properties. They achieved a maximum tensile strength of 31.6 MPa with the tensile strain reaching more than 200% and were able to withstand 1 × 10 5 times their weight. The thermal decomposition temperature of the betulin-derived PUs was over 300 °C. This study showcased a strategy to synthesize sustainable high-performance PU materials with a high biomass content (>75%).

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Section: ■ Methodsmentioning

confidence: 99%

Catalyst-Free Synthesis of Betulin-Based Polyurethane Elastomers with Outstanding Mechanical Properties and Solvent Resistance

Xu,

Ma,

Wang

et al. 2023

ACS Appl. Polym. Mater.

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“…1,3-Adamantanediol has a wide range of applications due to its rigid diamond-like structure, nonconjugated system, and bis-hydroxy functional groups. − In the semiconductor field, adamantane-modified photoresist materials have improved performance in various aspects. − For instance, Cheng and co-workers synthesized the low dielectric material 1,3-bis[(1,2-dihydro-benzocyclobutene-4-yl)methylvinylsilyloxy]adamantane with a high glass transition temperature, good thermal stability, and high cross-linking density. Anna and co-workers generated 1,3-bis(pyren-2-yl)adamantane by the interaction of pyrene and 1,3-adamantanediol.…”

Section: Introductionmentioning

confidence: 99%

Practical and Scalable Synthesis of 1,3-Adamantanediol

Hao,

Chen,

Yang

et al. 2024

Org. Process Res. Dev.

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A new method for the efficient synthesis of 1,3-adamantanediol is proposed. It has the advantages of good reaction selectivity, high isolated yield, easy purification, and safe operation. 3-Hydroxyadamantane-1-carboxylic acid reacts first with thionyl chloride to form 1,3-dichloro adamantane, which is then converted to 1,3-adamantanediol in a "triethylamine−water" solution. Three reaction types are involved: chlorination, decarbonylation, and hydrolysis. Under optimal reaction conditions, total isolated yields of up to 95% and purities of up to 99% were achieved. Isolated yields of 100 g per batch have been achieved, with potential for industrial production. We completed the decarbonylation of acyl chloride without the use of a metal catalyst. In addition, the reaction mechanism was investigated by combining experimental data and density functional theory.

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“…Therefore, the development of the performance of Cu and its alloys became an imperative issue in order to meet the industrial challenges in several industries such as machinery, electronic, transport and others. The most effective strategy to attain higher performance is the introducing of secondary phase in Cu matrix to fabricate Cu-matrix composites (CMCs) [3,4]. The main advantages involve high thermal and electrical conductivities, along with excellent mechanical performance and processing properties [5,6].…”

Section: Introductionmentioning

confidence: 99%

Microstructure and Some Characteristics of Copper-Graphene Nanocomposites Synthesized by Powder Technology

Ali

Mohammed

2021

E3S Web Conf.

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In recent years, nano-scale graphene (Gn) has generated a lot of interest owing to its remarkable characteristics, which made it a material of choice for reinforcing different kinds of materials for a broad range of engineering applications. In this study, a serious attempt has been paid to develop copper-graphene (Cu/Gn) nanocomposites by powder technology process using different concentrations of Gn. Also, microstructure, thermal, micro-hardness and wear properties have been studied.

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Shape memory materials based on adamantane-containing polyurethanes

Cited by 16 publications

References 37 publications

Catalyst-Free Synthesis of Betulin-Based Polyurethane Elastomers with Outstanding Mechanical Properties and Solvent Resistance

Catalyst-Free Synthesis of Betulin-Based Polyurethane Elastomers with Outstanding Mechanical Properties and Solvent Resistance

Practical and Scalable Synthesis of 1,3-Adamantanediol

Microstructure and Some Characteristics of Copper-Graphene Nanocomposites Synthesized by Powder Technology

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