Synthesis of cross-linked triple shape memory polyurethane with self-healing functionalities

Zhang, Wenwen; Leng, Xuefei; Gao, Mengyun; Wei, Zhiyong; Wang, Yiying; Li, Yang

doi:10.1016/j.polymertesting.2021.107099

Cited by 11 publications

(10 citation statements)

References 35 publications

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“…The multi-shape memory PUs can be synthesized by combining two or more polyols which results in a multi shape memory polymer with multiple switching temperatures. 100…”

Section: Introductionmentioning

confidence: 99%

A review on microphase separation measurement techniques for polyurethanes

Gholami

Haddadi‐Asl

Jouibari

2022

Journal of Plastic Film & Sheeting

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Polyurethanes (PUs) microstructure and characteristics is strongly affected by microphase separation that arises from the thermodynamic immiscibility between the hard and soft segments. The extent of phase separation as well as the morphology and size of the separated phase governs their mechanical, electrical, thermal, and functional properties. This review: (1) provides an insight into how phase separation affects PU properties, (2) explains methods used to study PU phase separation. We review approaches from the simplest one, that is, the transparency measurement, to the more advanced methods including the spectroscopic techniques (infrared, nuclear magnetic resonance spectroscopies and X-ray scattering), rheological instruments ( rheometrics mechanical spectrometer), and thermal analyses (differential scanning calorimetry). We also discuss the theoretical calculations and the molecular modeling used to study PU phase separation.

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“…The multi-shape memory PUs can be synthesized by combining two or more polyols which results in a multi shape memory polymer with multiple switching temperatures. 100…”

Section: Introductionmentioning

confidence: 99%

A review on microphase separation measurement techniques for polyurethanes

Gholami

Haddadi‐Asl

Jouibari

2022

Journal of Plastic Film & Sheeting

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“…Shape memory polymer is dependent on the design required by the products otherwise, because the interaction between shape memory polymer and product is highly correlated with the production [12][13][14][15]. As shape memory polymer has a high material cost, many foreign manufacturers use it to produce protection products with a high added value [16][17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%

Novel Composite Planks Made of Shape Memory Polyurethane Foaming Material with Two-Step Foaming Process

Lin

Shiu

et al. 2022

Polymers

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In this study, shape memory polyurethane (SMP) foaming material is used as the main material that is incorporated with carbon fiber woven fabrics via two-step foaming method, forming sandwich-structured composite planks. The process is simple and efficient and facilitates any composition as required. The emphasis of this study is protection performances, involving puncture resistance, buffer absorption, and electromagnetic wave shielding effectiveness. The proposed soft PU foam composite planks consist of the top and bottom PU foam layers and an interlayer of carbon fiber woven fabric. Meanwhile, PU foam is incorporated with carbon staple fibers and an aluminized PET film for reinforcement requirements and electromagnetic wave shielding effectiveness, respectively. Based on the test results, the two-step foaming process can provide the PU foam composite planks with excellent buffer absorption, puncture resistance, and electromagnetic wave shielding effectiveness; therefore, the proposed composite planks contribute a novel structure composition to SMP, enabling it to be used as a protective composite. In addition, the composites contain conductive material and thus exhibit a greater diversity of functions.

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“…Shape memory (SM) and self-healing (SH) polymers are two widely reported intelligent polymeric materials in the last decades [ 1 , 2 ]. To date, different polyurethanes (PUs) with various chemical structures are reported, which present both shape memory effect (SME) and SH behaviors due to the choice of diols (polyols), isocyanates, and chain extenders [ 3 , 4 , 5 ]. The incorporation of such intelligence into PUs enriches their application fields and prolongs service life.…”

Section: Introductionmentioning

confidence: 99%

Effects of Ligands in Rare Earth Complex on Properties, Functions, and Intelligent Behaviors of Polyurea–Urethane Composites

et al. 2022

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There is a need to create next-generation polymer composites having high property, unique function, and intelligent behaviors, such as shape memory effect (SME) and self-healing (SH) capability. Rare earth complexes can provide luminescence for polymers, and their dispersion is highly affected by ligand structures. Here, we created three different REOCs with different ligands before studying the effects of ligands on REOC dispersion in polyurea–urethane (PUU) with disulfide bonds in main chains. In addition, the effects of different REOCs on mechanical properties, luminescent functions, and intelligent behaviors of PUU composites were studied. The results showed that REOC I (Sm(TTA)3phen: TTA, thenoyltrifluoroacetone; phen, 1,10-phenanthroline) has incompatible ligands with the PUU matrix. REOC I and REOC III (Sm(BUBA)3phen: BUBA, 4-benzylurea-benzoic acid) with amine and urea groups facilitate their dispersion. It was REOC III that helped the maintenance of mechanical properties of PUU composites due to the good dispersion and the needle-like morphologies. Due to more organic ligands of REOC III, the fluorescence intensity of composite materials is reduced. The shape recovery ratio of the composite was not as good as that of pure PUU when a large amount of fillers was added. Besides, REOC I reduced the self-healing efficiency of PUU composites due to poor dispersion, and the other two REOCs increased the self-healing efficiency. The results showed that ligands in REOCs are important for their dispersion in the PUU matrix. The poor dispersion of REOC I is unbeneficial for mechanical properties and intelligent behavior. The high miscibility of REOC II (Sm(PABA)3phen: PABA, 4-aminobenzoic acid) decreases mechanical properties as well but ensures the good shape recovery ratio and self-healing efficiency. The mediate miscibility and needle-like morphology of REOC III are good for mechanical properties. The shape recovery ratio, however, was decreased.

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Synthesis of cross-linked triple shape memory polyurethane with self-healing functionalities

Cited by 11 publications

References 35 publications

A review on microphase separation measurement techniques for polyurethanes

A review on microphase separation measurement techniques for polyurethanes

Novel Composite Planks Made of Shape Memory Polyurethane Foaming Material with Two-Step Foaming Process

Effects of Ligands in Rare Earth Complex on Properties, Functions, and Intelligent Behaviors of Polyurea–Urethane Composites

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