Chitin based polyurethanes using hydroxyl terminated polybutadiene, part III: Surface characteristics

Zia, Khalid Mahmood; Zuber, Mohammad; Saif, Muhammad Jawwad; Jawaid, Mohammad; Mahmood, Khalid; Shahid, Muhammad; Anjum, Muhammad Naveed; Ahmad, Mirza Nadeem

doi:10.1016/j.ijbiomac.2013.10.001

Cited by 33 publications

(2 citation statements)

References 31 publications

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“…[8] The significant features of PU elastomers has been noted in various designed products to reveal impeccable properties and robust polymers with high possibility of recycling by simple process like extrusion and injection casting. [9,10] As such petroleum sources are renowned to form variety of polyols ventured to obtain precast PU, yet high energy demands and environmental effects occurred to seek for alternatives. In recent time, economically substantial and research interest arisen in renewable feedstock such as vegetable oils.…”

Section: Introductionmentioning

confidence: 99%

Catalyzed and Non‐catalyzed Synthetic Approaches to Obtain Isocyanate‐free Polyurethanes

Chelike

Andavan

2023

ChemistrySelect

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By reactions of both catalyzed and non-catalyzed pathway, we attempt to show that the synthetic route of non-isocyanate polyurethanes (NIPU) is developed quite recently. The advancement of sustainable, bio-renewable, impermeable and moisture-insensitive NIPU has started to contribute its role in academia and industry. In case of NIPU formulation, polycondensation of dicarbonate with diamine precursors as well as waste-free polyaddition of multifunctional cyclic carbonates with diamines via ring-opening polymerization. Obviously, since the hydroxyl groups (both primary and secondary hydroxyl group) arisen in NIPU is employed to reveal fairly different attributes compared to trivial polyurethanes (PU). The advantage of NIPU comprises of the role of carbon dioxide and renewable feedstock, while various cyclic carbonates obtained to react with diamine substrates to incorporate desired physicochemical and mechanical properties. Indeed, NIPU are noted to be non-toxic, biodegradable and exhibit remarkable properties. In this review, we account the imperative strategies employed in developing essential sustainable NIPU have been discussed in detail.

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Section: Introductionmentioning

confidence: 99%

Catalyzed and Non‐catalyzed Synthetic Approaches to Obtain Isocyanate‐free Polyurethanes

Chelike

Andavan

2023

ChemistrySelect

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“…The importance of PU elastomers is increasing because of their broad range of properties and increasing number of applications [ 1 , 2 , 3 ]. The macromolecules of PUEs are composed of relatively long, flexible segments (SSs) and short, rigid segments (HSs), with alternating polydisperse blocks.…”

Section: Introductionmentioning

confidence: 99%

Impact of Macrodiols on the Morphological Behavior of H12MDI/HDO-Based Polyurethane Elastomer

et al. 2021

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In this study, we evaluated the morphological behavior of polyurethane elastomers (PUEs) by modifying the soft segment chain length. This was achieved by increasing the soft segment molecular weight (Mn = 400–4000 gmol−1). In this regard, polycaprolactone diol (PCL) was selected as the soft segment, and 4,4′-cyclohexamethylene diisocyanate (H12MDI) and 1,6-hexanediol (HDO) were chosen as the hard segments. The films were prepared by curing polymer on Teflon surfaces. Fourier transform infrared spectroscopy (FTIR) was utilized for functional group identification in the prepared elastomers. FTIR peaks indicated the disappearance of −NCO and −OH groups and the formation of urethane (NHCOO) groups. The morphological behavior of the synthesized polymer samples was also elucidated using scanning electron microscopy (SEM) and atomic force microscopy (AFM) techniques. The AFM and SEM results indicated that the extent of microphase separation was enhanced by an increase in the molecular weight of PCL. The phase separation and degree of crystallinity of the soft and hard segments were described using X-ray diffraction (XRD). It was observed that the degree of crystallinity of the synthesized polymers increased with an increase in the soft segment’s chain length. To evaluate hydrophilicity/hydrophobicity, the contact angle was measured. A gradual increase in the contact angle with distilled water and diiodomethane (38.6°–54.9°) test liquids was observed. Moreover, the decrease in surface energy (46.95–24.45 mN/m) was also found to be inconsistent by increasing the molecular weight of polyols.

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Novel Lignin‐Based Materials as Products for Various Applications

Kłapiszewski

Jesionowski

2017

Handbook of Composites From Renewable Materials

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Chitin based polyurethanes using hydroxyl terminated polybutadiene, part III: Surface characteristics

Cited by 33 publications

References 31 publications

Catalyzed and Non‐catalyzed Synthetic Approaches to Obtain Isocyanate‐free Polyurethanes

Catalyzed and Non‐catalyzed Synthetic Approaches to Obtain Isocyanate‐free Polyurethanes

Impact of Macrodiols on the Morphological Behavior of H12MDI/HDO-Based Polyurethane Elastomer

Novel Lignin‐Based Materials as Products for Various Applications

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