Preparation of highly active 40wt.% Pt/C cathode electrocatalysts for DMFC via different routes
58
Citation
25
Reference
10
Related Paper
Citation Trend
Polycaprolactone (PCL) polyol was prepared by a ring opening polymerization of ε-caprolactone initiated by palm kernel oil (PKO) based polyol and 1,6-hexanediol to form a PCL/PKO based polyol. The properties of polyol were varied by their initiator:co-initiator weight ratio. The completion of polyol formation was characterized through Fourier Transformation Infrared (FTIR) spectroscopy. Other parameters such as acid number and hydroxyl number of polyol were also studied to monitor the progress of reaction. FTIR results showed the significant changes particularly for the OH and C=O stretching peaks.
Polycaprolactone
Trimethylolpropane
Hydroxyl value
Propanediol
Palm kernel oil
Cite
Citations (12)
Special dispersant had been exploited by using glycerol to react with TDI in polyol.Excellent high polyurethane content PIPA polyol had been composed by using this dispersant.The performance of the foam prepared using this polyol was outstanding.
Cite
Citations (0)
In this paper, synthesizing principle, preparation methods, main factors affecting on properties of polyisocynate polyaddition (PIPA) polyol,including velocity,solid content,polyether polyol,hydramine,isocyanate,reaction temperature,stir speeds were summarized. The problem about preparing PIPA polyol were pointed out. the current of PIPA polyol was prospected.
Isocyanate
Cite
Citations (0)
Palm stearin
Cite
Citations (25)
A polyether polyol was synthesized from sucrose,glycerol and oxypropane.The method of orthogonal test was used and the main influence factors of synthesizing the polyether polyol were studied.The best reaction conditions finally were got: the suitable adding mount proportion of sucrose and glycerol was 1∶1(mole ratio);the best catalyst using amount should be 1% of the whole reactants;the reactor was vacuumized by using N2 to replace three times.Then polymerization reactive temperature was controlled to 95℃;after 1h the best PO feed speed keeping in 5mL/min,the high quality polyether polyol was produced.Based on this result,the synthesis reaction regularity of polyether polyol from sucrose was clearly by more study on the main influence factors.
Cite
Citations (0)
This research focused on synthesis of epoxidized soybean oil in order to produce soy-based polyol which later was used to produce soy-based polyurethane. Soy-based polyol was produced through alcoholysis process of ESBO with glycerol (1:3 and 1:5) molar ratio. Polyol A had a ratio of 1:3 while polyol B had 1:5 ratio. The polyols were investigated by IR spectra and viscosity test. The polyols then were used to produce three formulation of polyurethane samples which were 20MDI:80polyol, 30MDI:70polyol and 40MDI:60polyol. The polyol samples were investigated by IR spectra, hardness test and gel content test. From FTIR result, polyol A and polyol B showed the incorporation of hydroxyl group from glycerol at 3430.26 cm −1 and 3281cm −1. There was a formation of N-H group in PU 1 and PU 4 at 3451 cm −1 and 3448 cm −1. The viscosity of polyol A was higher compared to polyol B. PU 1, PU 2 and PU 3 which made up from polyol A had higher hardness and gel content compared to PU 4, PU 5 and PU 6 which made up from polyol B.
Cite
Citations (4)
American Cyanamid Company has developed a novel, high functional carbamylmethylated melamine polyol named CYUNK™ HPC polyol. The reactivity of CYUNK™ HPC polyol was studied and compared with that of an aromatic amine polyol (Pluracol® 824 polyol) and a sucrose-based polyol (Voranol® 360 polyol). A combination of the CYUNK™ HPC polyol and aromatic amine polyol was used for the preparation of rigid urethane foams. Water, CFC-11A and a mixture of CFC-11A and water (50/50) were used as the blowing agents. The k-factor of the foams containing CYUNK™ HPC was good: 0.022 W/mK for the water-blown system, 0.018 for the foam blown with a mixture of CFC-11A and water, and 0.015 for the CFC-11A blown foam. In all cases, retention of the k-factor with ageing (at room temperature and 70°C) was better for foams containing CYLINK™ HPC than for the control foams. Photomicrographs of the cell structure showed that the cell size of the foams containing CYLINK™ HPC polyol was smaller than that of the control foams. The presence of CYLINK™ HPC polyol decreased the combustibility of the water-blown rigid urethane foams. This effect was very significant in the case of foams containing sucrose-based polyol. The residue after burning of the reference foam without flame retardant was 26%, and with flame retardant (10 pbw) 48%. The residue after burning of the foam containing 30 pbw of CYUNK™ HPC polyol without flame retardant was 76%. CYUNK™ HPC polyol can thus be classified as a reactive flame retardant ** . The study also included the effect of surfactant concentration and isocyanate index on the properties of water-blown rigid urethane foams containing CYUNK™ HPC polyol.
Blowing agent
Cite
Citations (1)
Novel modified polyols for polyurethane, including polymer polyol, polyurea polyol, polymeric polyols and unsaturated polyester polyol are summarized. In this paper the discussion is centered on the widely used polymer polyol and polyurea polyol.
Polyurea
Cite
Citations (0)
Soybean oil
Epoxidized soybean oil
Cite
Citations (129)