Bio-based UV curable polyurethane acrylate: Morphology and shape memory behaviors

Khasraghi, Samaneh Salkhi; Shojaei, Akbar; Sundararaj, Uttandaraman

doi:10.1016/j.eurpolymj.2019.06.019

Cited by 36 publications

(30 citation statements)

References 74 publications

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“…Summarizing T g and T di values of fully and partially biobased SMPs reported in literature so far (Figure b, Table S1), − ,,− it is interesting to conclude that poly(IE-dea) and poly(G-dea) have superiorly high, and in fact the highest, thermal resistance among all available fully biobased SMPs reported so far.…”

Section: Results and Discussionmentioning

confidence: 85%

Development and Mechanism of High-Performance Fully Biobased Shape Memory Benzoxazine Resins with a Green Strategy

Sha

Yuan

Liang

et al. 2020

ACS Sustainable Chem. Eng.

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Developing high-performance fully biobased shape memory thermosets with a green strategy is a challenging topic of great interest. Herein, two unique fully biobased benzoxazine resins with excellent shape memory properties, denoted as poly(IE-dea) and poly(G-dea), were developed by synthesizing two fully biobased benzoxazine monomers (IE-dea and G-dea) using a solvent-free method. The thermal, mechanical, and shape memory properties of poly(IE-dea) and poly(G-dea) were studied. Among the fully biobased shape memory polymers reported so far, poly(IE-dea) and poly(G-dea) have the highest glass transition temperatures (138 and 216 °C), initial thermal decomposition temperatures (340 and 347 °C), and tensile strengths (85.1 ± 2.5 and 65.9 ± 2.7 MPa). In addition, poly(IE-dea) and poly(G-dea) exhibit excellent shape memory properties. After four shape memory cycles, their shape fixity ratios are 97.7–98.0% and 96.7–97.2%, respectively, and their shape recovery ratios are 96.7–97.2% and 93.0–93.4%. In fact, they are the first two fully neat biobased shape memory benzoxazine resins up-to-date. The mechanism behind the excellent integrated performances of poly(IE-dea) and poly(G-dea) results from unique integrated actions of the flexible decane segment and rigid cross-linked structure from the polymerization of oxazine rings.

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Section: Results and Discussionmentioning

confidence: 85%

Development and Mechanism of High-Performance Fully Biobased Shape Memory Benzoxazine Resins with a Green Strategy

Sha

Yuan

Liang

et al. 2020

ACS Sustainable Chem. Eng.

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“…The hard segment content by weight in the synthesized APUAs was determined using the following equation based on the mass ( M ) of each component

HS ((), wt %) = \frac{M_{TDI} + M_{HEMA} + M_{Reactive diluent}}{M_{TDI} + M_{HEMA} + M_{PEG} + M_{Reactive diluent}} .

…”

Section: Methodsmentioning

confidence: 99%

Effect of reactive diluent on gas separation behavior of photocurable acrylated polyurethane composite membranes

Molavi

Shojaei

Mousavi

et al. 2019

J of Applied Polymer Sci

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In this study, the effects of the type and content of reactive diluents on the permeation/separation of carbon dioxide/nitrogen (CO 2 /N 2 ) through acrylate-terminated polyurethane (APU)-acrylate/acrylic diluent (APUA) composite membranes was investigated. A series of APUs based on poly(ethylene glycol) (PEG)-1000 g mol −1 , toluene diisocyanate, and 2-hydroxyethyl methacrylate was synthesized and then diluted with several reactive diluents. The results obtained from differential scanning calorimetry (DSC) and Fourier transform infrared analyses showed that the microphase interference of hard and soft segments increased with increasing reactive diluent content. Furthermore, with increasing alkene double bond of reactive diluents, the degree of phase separation increased, which might be due to the higher gel content of APUAs. APUAs were used as top selective layer on PS/PSF as the support layer to obtain composite membrane. Field emission scanning electron microscopy micrographs revealed that APUAs penetrated into the support layer, leading to strong interfacial adhesion between APUA and support layers. The gas permeation experiments indicated that the gas permeability decreased, while the CO 2 /N 2 selectivity increased with increasing reactive diluent content due to the enhancement of crosslinking density of APUAs. Moreover, the reactive diluent with high polarity, for example, acrylonitrile monomer, exhibited higher CO 2 /N 2 selectivity due to the improvement in solubility of CO 2 in APUA, while the permeability was retained compared with other reactive diluents. The thickness of APUA selective layer exhibited expectedly opposite effect on permeability and selectivity; however, the increment in selectivity is higher than the reduction in permeability when the thickness decreased from 50 to 10 μm.

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“…A SMPU/i-MWCNT composite shape strain-recovery cycle is shown in Figure 5C, and is consistent with the quantitative analysis results. The reinforced electroactive shape memory effects may be attributed to addition of i-MWCNT, which reduces the degree of microphase separation within the SMPU and effectively increases the extent of interfacial interaction with SMPU in the composites (Khasraghi et al, 2019).…”

Section: Conductive Electrothermal and Shape Memory Effectsmentioning

confidence: 99%

Electroactive shape memory polyurethane composites reinforced with octadecyl isocyanate-functionalized multi-walled carbon nanotubes

Sun

Teng

Kuang

et al. 2022

Front. Bioeng. Biotechnol.

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Shape memory polymers (SMPs) have a wide range of potential applications in many fields. In particular, electrically driven SMPs have attracted increasing attention due to their unique electrical deformation behaviors. Carbon nanotubes (CNTs) are often used as SMP conductive fillers because of their excellent electrical conductivities. However, raw CNTs do not disperse into the polymer matrix well. This strictly limits their use. In this study, to improve their dispersion performance characteristics in the polymer matrix, hydroxylated multi-walled carbon nanotubes (MWCNT-OHs) were functionalized with octadecyl isocyanate (i-MWCNTs). Polyurethane with shape memory properties (SMPU) was synthesized using polycaprolactone diol (PCL-diol), hexamethylene diisocyanate (HDI), and 1,4-butanediol (BDO) at a 1:5:4 ratio. Then, electroactive shape memory composites were developed by blending SMPU with i-MWCNTs to produce SMPU/i-MWCNTs. The functionalized i-MWCNTs exhibited better dispersibility characteristics in organic solvents and SMPU composites than the MWCNT-OHs. The addition of i-MWCNTs reduced the crystallinity of SMPU without affecting the original chemical structure. In addition, the hydrogen bond index and melting temperature of the SMPU soft segment decreased significantly, and the thermal decomposition temperatures of the composites increased. The SMPU/i-MWCNT composites exhibited conductivity when the i-MWCNT content was 0.5 wt%. This conductivity increased with the i-MWCNT content. In addition, when the i-MWCNT content exceeded 1 wt%, the composite temperature could increase beyond 60°C within 140 s and the temporary structure could be restored to its initial state within 120 s using a voltage of 30 eV. Therefore, the functionalized CNTs exhibit excellent potential for use in the development of electroactive shape memory composites, which may be used in flexible electronics and other fields.

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Bio-based UV curable polyurethane acrylate: Morphology and shape memory behaviors

Cited by 36 publications

References 74 publications

Development and Mechanism of High-Performance Fully Biobased Shape Memory Benzoxazine Resins with a Green Strategy

Development and Mechanism of High-Performance Fully Biobased Shape Memory Benzoxazine Resins with a Green Strategy

Effect of reactive diluent on gas separation behavior of photocurable acrylated polyurethane composite membranes

Electroactive shape memory polyurethane composites reinforced with octadecyl isocyanate-functionalized multi-walled carbon nanotubes

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