Other Examples of Cured Polyester Processes

4 OTHER EXAMPLES OF CURED POLYESTER PROCESSES 2.4.1 System 1 

A 3000 molecular weight poly(propylene etlier) triol (Arcol F3020, 90 g) was mixed with maleic anliydride (60 g) and zinc chloride (2.25 g) in a tliree-necked round-bottomed flask equipped with a magnetic stiner, a condensor and a tlier-mometer. Under a nitrogen atmosphere, tire reaction mixmre was heated to 190 °C 

The product from tliis system can be cured by using a conventional radical initiator such as benzoyl peroxide (BPO). To a sample (lOOg) of diis product, 1.5 g of BPO in a small amount of styrene was added. The mixture was poured into a mold and heated at 50°C overnight and tlien at 75°C and 100 °C for 2h each, and finally at 135 °C for 3h in an air oven. The material hardened to a transparent solid with a very good surface. 

1 ETHER CLEA VAGE REACTION LEADING TO POLY(ETHER ESTER) RESINS 

Poly(propylene edier) polyol is die single most important product from propylene oxide and enjoys a predominant position in polyurethane applications. The ether linkages are veiy abundant in diese polyols and they contribute to the physical and chemical properties in many applications such as surfactant action and hydrogen-bond formation. 

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