Results 11 to 20 of about 17,869 (307)
Thermal Stability of Aqueous Polyurethanes Depending on the Applied Catalysts [PDF]
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
doaj +2 more sources
High Performance Shape Memory Polyurethane Synthesized with High Molecular Weight Polyol as the Soft Segment [PDF]
Applied Sciences, 2012 Shape memory polyurethanes (SMPUs) are typically synthesized using polyols of low molecular weight (MW~2,000 g/mol) as it is believed that the high density of cross-links in these low molecular weight polyols are essential for high mechanical strength ...
Manzoor Ahmad +6 more
doaj +2 more sources
Sustainability in polyurethanes: old hat or new strategy for future developments? [PDF]
npj Materials SustainabilityPolyurethanes are facing health and environmental problems related to their chemistry, processing and end-of-life management. This review summarizes the most recent strategies within the framework of sustainability and circularity related to the use of ...
Giulio Malucelli, Alessandra Lorenzetti
doaj +2 more sources
Synthesis of Stereocontrolled Polyurethanes with Defined Monomer Order by Step-economy Approach [PDF]
, 2023 Polyurethanes are valuable materials in the industrial sector due to their broad scope of various applications. Traditional synthesis methods rely on step-growth polymerization, which inherently lacks precise molecular weight and structure control ...
Vijaj, Gupta +3 more
core +2 more sources
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 +4 more sources
Degradability of cross-linked polyurethanes/chitosan composites [PDF]
, 2017 Polyurethanes with synthetic poly([R,S]-3-hydroxybutyrate) in the soft segment and with polycaprolactone triol as cross-linker were blended with chitosan and degraded in hydrolytic and oxidative solutions.
Rutkowska, Maria +20 more
core +2 more sources
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
doaj +1 more source
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
doaj +1 more source
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
doaj +1 more source
The physical properties of polyurethanes [PDF]
, 1971 The term "Polyurethane" refers to a large group of synthetic organic polymers that have found widespread commercial application in the last two decades.
Yang, Michael W.
core +1 more source