Processability and Property Latitude of Elastomers Based on Ultra-Low Monol PPG Polyols

2 Processability and Property Latitude of Elastomers Based on Ultra-Low Monol PPG Polyols 

Ultra-low monol PPG diols are commercially available in molecular weights from 2000 to 12,000. A product summary is given in Table 9.4. To determine the formulating range of the various diols in MDI/BDO cured elastomers, we prepared MDI prepolymers based on the 2000, 4000 and 8000 MW diols at a wide range of isocyanate contents. These prepolymers were chain extended with BDO to produce elastomers with a broad range of properties. Tables 9.5 to 9.7 summarise the prepolymer compositions and viscosities, processing characteristics and physical properties of these elastomers. 

Acclaim Polyol Molecular Weight Composition Functionality Hydroxyl Type 

CHARACTERISTICS dilaurate catalyst Moulds 100 C cured 16 hours 100 C  

ELASTOMER PROPERTIES Samples conditioned 4 weeks 23 °C/50% relative humidity  

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