Citation: DING Jianfu, XUE Gi, CHENG Rongshi. DYNAMIC MECHANICAL RESPONSE OF CRAZES IN POLYSTYRENE*[J]. Chinese Journal of Polymer Science, ;1994, 12(3): 266-277. shu

DYNAMIC MECHANICAL RESPONSE OF CRAZES IN POLYSTYRENE*

Received Date: 24 April 1993

Dynamic mechanical analysis was used to study the mechanical properties and microstructureof crazes in polystyrene produced in air or in methanol at different temperatures. A new loss peakwas found at about 82℃,which is assigned to glass transition peak of craze fibrils. The decreaseof glass transition temperature of polymer in craze fibrils is due to the high values of surface tovolume ratio. The glass transition temperature ratio of craze fibrils to bulk material (Tgl /Tg) hasbeen expressed as a function of the fibrils diameter(d).From Tg' of craze fibrils,the value of fibril diameter can be calculated.Annealing the crazed specimen at room temperature makes the fibrils plastically deform and cause the fibrils to thin slightly,whereas annealing the crazed specimen at the temperature near Tg of the craze fibrils makes the fibrils bundle together.
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