Biobased hyperbranched shape‐memory polyurethanes: Effect of different vegetable oils

Kalita, Hemjyoti; Karak, Niranjan

doi:10.1002/app.39579

Cited by 47 publications

(59 citation statements)

References 28 publications

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“…The study showed that the characteristic (composition and structure of fatty acids) of the vegetable oils has a prominent role in the control of ultimate properties, including the shape memory and biological behaviors of such hyperbranched polyurethanes. Among Mesua ferrea, sunflower, and castor oils, Mesua ferrea L. seed oil-based hyperbranched polyurethane showed the highest thermal stability, whereas the castor oil-based one exhibited the highest tensile strength with same composition and structure of other components in the polymers (54). Although all such hyperbranched polyurethanes showed good shape fixity, the castor oil-based polyurethane showed the highest shape recovery (54).…”

Section: Methods Preparative Methods Both For the Bio-based Hyper-mentioning

confidence: 95%

“…Among Mesua ferrea, sunflower, and castor oils, Mesua ferrea L. seed oil-based hyperbranched polyurethane showed the highest thermal stability, whereas the castor oil-based one exhibited the highest tensile strength with same composition and structure of other components in the polymers (54). Although all such hyperbranched polyurethanes showed good shape fixity, the castor oil-based polyurethane showed the highest shape recovery (54).…”

Section: Methods Preparative Methods Both For the Bio-based Hyper-mentioning

confidence: 95%

“…Similarly, Mesua ferrea and sunflower oil-based hyperbranched polyurethanes with different compositions and structures are obtained by using monoglyceride of the oils as bio-based chain extender, glycerol, hyperbranched polyol (s-triazine-based hyperbranched polyether polyol), pentaerythritol, triethanol amine (any one), etc. as the branch-generating component and other reactants like above (49)(50)(51)(52)(53)(54). Hyperbranched polyurethanes are also prepared from soybean oil-modified hyperbranched polyols, obtained via epoxidation and hydroformylation routes.…”

Section: Methods Preparative Methods Both For the Bio-based Hyper-mentioning

confidence: 99%

“…This is mainly due to slippage of layers of graphene though hidden chain length and sacrificial bond of polyurethane chains. Furthermore, the vegetable oil-based hyperbranched polyurethane exhibited enhanced flexibility compared to the petroleum-based ones (54). The long aliphatic hydrocarbon chain of fatty acid may attribute to this flexibility.…”

Section: Rheological and Mechanical Propertiesmentioning

confidence: 99%

“…are included in such applications. Bio-based hyperbranched polyurethanes and their nanocomposites exhibited excellent shape memory property (44,45,(51)(52)(53)(54)59,62,68,77,78,(83)(84)(85). The incorporation of different nanomaterials on such nanocomposites showed improved shape memory behaviors from their respective pristine polyurethanes.…”

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confidence: 93%

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Bio‐Based Hyperbranched Polyurethane Nanocomposites

Karak

2015

Encyclopedia of Polymer Science and Technology

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BIO-BASED HYPERBRANCHED POLYURETHANE NANOCOMPOSITESadjusting the ratio of isocyanate (-NCO) to hydroxyl (-OH) functionality and the chemical composition in the final structure of the polyurethane, different types of polymeric products like thermosetting resin and elastomer as well as thermoplastic and fiber can be obtained (3). In all such polyurethanes, the main linkage, urethane (-NH-C(=O) -O-) is a unique combination of rigid amide (-NH-C=O), which has a tendency to donate proton, and a flexible ester (-O-C=O) group, which has a tendency to accept proton. Further flexibility arises from the flexible soft segment and long hydrocarbon part of fatty acid chains of the vegetable oil component present in the bio-based segmented polyurethanes. Moreover, they are biodegradable and biocompatible. All these unique features of bio-based polyurethanes widen their applications in the domains of coating, paint, adhesive, sealant, composite, biomaterial, smart material, and so on.Again, incorporation of branching in the polymer structure greatly influences the processing and properties of the branched polymer. Thus hyperbranched polymers are treated as macromolecules for 21st century. These hyperbranched polymers are one type of dendritic polymers ( Fig. 1), where the other type is a perfectly regular structure with a three-dimensional architecture, known as a dendrimer (4). However, hyperbranched polymers are preferred in most of the industrial applications over multistep laborious synthesized dendrimers because of easier and simpler one-step synthetic protocol of the former as they can accommodate some defects in their structures. Thus mass-scale industrial production at relatively low cost is possible for hyperbranched polymers like conventional linear polymers. However, hyperbranched polymers enjoy many advantages over linear polymers (Fig. 1). These include a unique three-dimensional structural architecture with dendritic, linear, and terminal units, the presence of a large number of freely exposed surface groups, low polydispersity index, low viscosity, high solubility, high compatibility with other materials, etc. Therefore, bio-based hyperbranched polyurethanes are preferred as superior materials over their conventional analogs for different advanced applications.However, "virginity is not a virtue" in case of polymer, whatsoever the structural architecture is! Thus bio-based hyperbranched polyurethanes also require to be adulterated by incorporation of appropriate additives or ingredients. It is pertinent to mention here that most of the vegetable oil-based hyperbranched polyurethanes do not have required mechanical strength and toughness, although they possess very good flexibility. In this vein, conventional filled and composite systems are widely used, although both the approaches suffer from serious drawbacks, as a huge amount of additive(s) is necessary to be incorporated to achieve the desired level of performance of the stated polyurethanes. Most importantly, the resultant products lost most of the central a...

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Section: Methods Preparative Methods Both For the Bio-based Hyper-mentioning

confidence: 95%

Section: Methods Preparative Methods Both For the Bio-based Hyper-mentioning

confidence: 95%

Section: Methods Preparative Methods Both For the Bio-based Hyper-mentioning

confidence: 99%

Section: Rheological and Mechanical Propertiesmentioning

confidence: 99%

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Bio‐Based Hyperbranched Polyurethane Nanocomposites

Karak

2015

Encyclopedia of Polymer Science and Technology

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Mechanical, thermal and accelerated weathering studies of bio‐based polyurethane/clay nanocomposites coatings

et al. 2017

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Biobased polymer has taken tremendous attention in recent times. In the present study bio-based polyurethane have been synthesized from the vegetable oil i.e., dehydrated castor oil, 1,4-butanediol and isophorone diisocyanate in presence of a catalyst by solution polymerization method. Then polyurethane nanocomposites were synthesized using different amount of nanoclay (C30B) (1, 3 and 5 wt%). The synthesis of polyurethane and its nanocomposites were confirmed by FTIR and XRD analysis. The mechanical properties such as tensile strength (2.2-4.5 MPa), elongation at break (299%-435%) hardness (46-70) and abrasion resistance (351-201 mg/1,000 cycles) increased with the increase of nanoclay content. The initial thermal degradation temperature found to increase from (220 to 290°C) with the increase of nanoclay content in the nanocomposites. The nanoclay was interacted with the hard segment of the matrix polymer as reflected from the atomic force microscopy studies. Weathering study revealed that nanocomposites have higher weather resistance capacity than pristine polyurethane. It can be concluded that the prepared nanocomposites might be good outdoor topcoat materials. K E Y W O R D Smechanical properties, polyurethane, vegetable oil, weather resistance 1956 |

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Influence of prepolymer reaction time in the fabrication of palm kernel oil polyol based shape memory polyurethane

Saad

Salleh

Abdullah

et al. 2021

J of Applied Polymer Sci

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Vegetable oil-based shape memory polyurethane (SMPU) has been rapidly developed in the field of advanced polymeric materials due to its unique responsive characteristic. This research aimed to investigate the effect of prepolymer reaction time on the microphase separation, soft segment crystallinity, shape memory, and tensile properties of palm kernel oil polyol (PKO-p)-based SMPU. The SMPU samples were prepared via two-step bulk polymerization process utilizing 4,4-methylenebis (cyclohexyl isocyanate) (HMDI), polycaprolactone diol (PCL) and 1,4-butanediol (BD). The reaction time after the addition of PKO-p varied from 0.5 to 2.5 h in prepolymer synthesis. This reaction time resulted in excellent microphase separation and improve shape memory properties. The Fourier transform infra-red analysis revealed that the degree of microphase separation of the polyurethane elastomer (PUE) increased with increasing prepolymer reaction time. In consequence, the shape fixity behavior of the PUE samples improved. The tensile strength and strain at break of PUE increased with increasing reaction time up to 2.0 h. However, when the reaction time was prolonged to 2.5 h, both values decreased. Thus, the results showed the advantages of using PKO-p, which can minimize the usage of petroleum-based polyol and improve the tensile and shape memory behavior of the PKO-p-based SMPU.

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Biobased hyperbranched shape‐memory polyurethanes: Effect of different vegetable oils

Cited by 47 publications

References 28 publications

Bio‐Based Hyperbranched Polyurethane Nanocomposites

Bio‐Based Hyperbranched Polyurethane Nanocomposites

Mechanical, thermal and accelerated weathering studies of bio‐based polyurethane/clay nanocomposites coatings

Influence of prepolymer reaction time in the fabrication of palm kernel oil polyol based shape memory polyurethane

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