Roles of chain length, chain architecture, and time in the initiation of visible crazes in polystyrene

Macromolecules

Volumn 41, Issue 12, 2008, Pages 4484-4491

  De Focatiis, Davide S A ^a   Buckley, C Paul ^a   Hutchings, Lian R ^b  

^a UNIVERSITY OF OXFORD   (United Kingdom)

^b DURHAM UNIVERSITY   (United Kingdom)

Author keywords

[No Author keywords available]

Indexed keywords

CHAIN LENGTH; EIGENVALUES AND EIGENFUNCTIONS; ETHYLENE GLYCOL; GLYCOLS; POLYMER BLENDS; POLYSTYRENES;

ACTIVATION VOLUMES; CHAIN ARCHITECTURE; CHAIN RETRACTION; CHAIN SCISSIONS; CRAZE FIBRIL; CRAZE INITIATION; DIETHYLENE GLYCOL (DEG); INITIATION (ELECTRIC DISCHARGES); MONO DISPERSED; WIDE-RANGE;

MOLAR MASS;

EID: 47249159949     PISSN: 00249297     EISSN: None     Source Type: Journal    
DOI: 10.1021/ma702157m     Document Type: Article

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36. From this point we use the term "initiated" to mean crazes just became visible under the conditions of the experiment.
37. Here we do not consider the entropie changes arising due to stretch of the fibrils since we are concerned with the early stages of craze initiation in isotropic materials. Entropy changes may become significant during craze growth or during initiation in preoriented materials.
38. With increasing molar mass, retraction of each chain involves an increasing number of hops, but fewer molecules are required to retract to form one fibril.