Polyol functionality

R1 can be a polyester or polyether with a polyol functionality of two or more... 

Polyol Functionality in Relation to Method of Preparation--Ratio of Lignin Copolymer to Propylene Oxide (All Reactions 4 hrs. reaction time temperature 200-250°C)... 

The big disadvantages of this technology are the long reaction time, many technological phases and the difficulty of establishing exactly the real final polyol functionality (the content of the diols remaining in the polyether after the intermediate vacuum distillation is difficult to measure accurately). 

Table 21.4 Conversion at gel point as function of oligo-polyol functionality and isocyanate functionality ...

A very subtle effect of the oligo-polyols functionality is seen in the case of propoxylated polyether polyols, due to the presence in oligo-polyol composition of a polyether monol as a consequence of the rearrangement of PO to allyl alcohol during anionic PO polymerisation (see section 4.1), with this structure ... 

Isonol. [Dow] Polyether polyol functional polyol for polyurethane industry for industrial/consumer RIM and structural polymers, dynamic elastomers, adhesives, binders, coatings, and sealants. 

In this chapter, the dramatic effect that monol content or polyol functionality has on processability and properties of polyurethane cast elastomers is discussed. This effect is shown for elastomers prepared by both the prepolymer and one-shot processes. Further improvements in elastomer processability and formulating latitude can be achieved by incorporating oxyethylene moieties into the polyol backbone. For one-shot elastomer processes, ultra-low monol PPG polyols capped with ethylene oxide have been commercialised. 

Figure 9.4 Effect of polyol functionality on theoretical elastomer molecnlar weight...

BASE POLYOL FUNCTION- ALITY ALENT WEIGHT HYDROXYL NUMBER VISCOSITY, CPS,AT25 C. CYCLIC, WEIGHT, % TYPE... 

There is the potential for three absorption bands around the 1470 cm band at 1490, 1470, and 1450 cm The weak but distinct absorption at 1490 cm and a major absorption band at 1450 cm , combined with a weak overlapped absorptions at 1100 cm indicates the presence of secondary alcohol function, originating from a material such as propylene glycol and glycerol. Alternatively, if the material is based on pentaerythritol, trimethylolethane, or trimethylolpropane as the polyol function of the alkyd resin, where the OH groups are from a primary alcohol, the strong peak at 1470 cm dominates and overlaps the bands at 1490 and 1450 cm reducing them to shoulders on the main absorption [79]. 

Y. Lu, R.C. Larock, Soybean-oil-based waterborne polyurethane dispersions effects of polyol functionality and hard segment content on properties. Biomacromolecules... 

Y. Lu and R. C. Larock, Soybean-Oil-Based Waterborne Polyurethane Dispersions Effects of Polyol Functionality and Ltard Segment Content on Properties. Biomacromolecules 9, 3332-3340 (2008). 

In order to complete our model, we need to know the soft phase modulus, Egp. It depends on several factors, most notably polyol equivalent weight. Eg, polyol functionality, fp, and polyol glass transition temperature, Tgp. At temperatm-es substantially above (elastomeric region), the modulus of the soft phase can be described using network elasticity models [57-59] ... 

In this research, a novel semi-interpenetrating networks electrolyte has been developed by a solvent-free reactive process. A flexible amorphous polyether modified polysiloxane is incorporated in polyurethane and form semi-interpenetrating network (IPN) structure by in-situ polymerization of polyurethane with the presence of PEMPS and salts. The monomer of polyurethane, polyol, functions as the common solvent to dissolve the salts so no additional volatile solvent is needed in this reactive process. The addition of PEMPS is expected to improve the ionic conductivity of polyurethane due to its high ionic conductivity and the decrease in crystalinity of soft segment of polyurethane as well as the generation of the high conductive interface. 

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