Results 11 to 20 of about 7,310 (265)
The Electronic Journal of Combinatorics, 2020 We consider the involutions known as toggles, which have been used to give simplified proofs of the fundamental properties of the promotion and evacuation maps. We transfer these involutions so that they generate a group $\mathscr P_n$ that acts on the set $S_n$ of permutations of $\{1,\ldots,n\}$.
openaire +3 more sources
Applied Sciences, 2019 Two series of rigid polyurethane-polyisocyanurate foams (RPU/PIR) modified by cinnamon extract (series C_0t and CU_0t) were obtained. One RPU/PIR series contained a commercial flame retardant (C_0t) in the formulation.
Joanna Liszkowska +5 more
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Effect of Glycerol in Soft and Hard Segments on Properties of Shape Memory Polyurethane [PDF]
علوم و تکنولوژی پلیمر, 2023 Hypothesis: Chemical cross-linked shape memory polyurethanes (CSMPUs) can have various applications in different fields such as medicine, where mechanical behavior and shape memory are improved in these samples compared to linear shape memory ...
Mahdi Sakhavi +3 more
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Science and Technology of Advanced Materials, 2020 We report the dynamic behavior of diselenide-containing hydrophilic polyurethanes and hydrogels based on diselenide exchange reactions in an aqueous media.
Hao Xu +6 more
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Thermal Stability of Aqueous Polyurethanes Depending on the Applied Catalysts
Sensors, 2006 The thermal stability of aqueous polyurethanes has been measured applying thethermogravimetric analysis. The aqueous polyurethanes (aqPUR) with catalysts of differentselectivity have been studied by use of the dynamic method.
Miroljub Barac +6 more
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Lignocellulosic Biomass as a Source of Raw Materials for the Synthesis of Polyurethanes
Proceedings, 2018 Precursors have been satisfactorily synthesized from lignocellulosic biomass for later use in the synthesis of polyurethanes resulting in competitive final properties with those of petroleum derived polyurethanes.
Tamara Calvo-Correas +6 more
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Molecules, 2023 Due to growing concerns about environmental issues and the decline of petroleum-based resources, the synthesis of new biobased compounds for the polymer industry has become a prominent and timely topic.
Aliénor Delavarde +4 more
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The Vaginal Microbiota, Bacterial Biofilms and Polymeric Drug-Releasing Vaginal Rings
Pharmaceutics, 2021 The diversity and dynamics of the microbial species populating the human vagina are increasingly understood to play a pivotal role in vaginal health. However, our knowledge about the potential interactions between the vaginal microbiota and vaginally ...
Louise Carson +6 more
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Molecules, 2019 Polyurethanes are widely used in the development of medical devices due to their biocompatibility, degradability, non-toxicity and chemical versatility.
Yomaira L. Uscátegui +6 more
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