Roles of chain length, chain architecture, and time in the initiation of visible crazes in polystyrene
Visible craze initiation stress has been measured for a wide range of linear and branched monodisperse polystyrenes (PS) soaked in diethylene glycol. Results show that, for a given time under stress, craze initiation in linear PS is disentanglement-dominated below a critical molar mass and chain sci...
| Main Authors: | , , |
|---|---|
| Format: | Journal article |
| Language: | English |
| Published: |
2008
|
| _version_ | 1797082759012810752 |
|---|---|
| author | De Focatiis, D Buckley, C Hutchings, L |
| author_facet | De Focatiis, D Buckley, C Hutchings, L |
| author_sort | De Focatiis, D |
| collection | OXFORD |
| description | Visible craze initiation stress has been measured for a wide range of linear and branched monodisperse polystyrenes (PS) soaked in diethylene glycol. Results show that, for a given time under stress, craze initiation in linear PS is disentanglement-dominated below a critical molar mass and chain scission-dominated above it. Branched monodisperse PS behaves similarly, with the relevant molar mass in this case being the span molar mass. Disentanglement craze initiation stress is found to vary linearly with log molar mass and log time. These observations can be explained in terms of Eyring-type stress acceleration of the process of chain retraction, required to achieve me entanglement loss necessary for creation of craze fibril surfaces. A single effective activation volume of 1.8 nm3 accounts for the dependence of crazing stress on molar mass, time, and temperature under uniaxial tensile stress, both as observed in the present data and in a previous study of rate/temperature dependence. © 2008 American Chemical Society. |
| first_indexed | 2024-03-07T01:32:22Z |
| format | Journal article |
| id | oxford-uuid:9407ce5a-b957-4088-af34-cc00c7b89e1f |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-07T01:32:22Z |
| publishDate | 2008 |
| record_format | dspace |
| spelling | oxford-uuid:9407ce5a-b957-4088-af34-cc00c7b89e1f2022-03-26T23:36:26ZRoles of chain length, chain architecture, and time in the initiation of visible crazes in polystyreneJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:9407ce5a-b957-4088-af34-cc00c7b89e1fEnglishSymplectic Elements at Oxford2008De Focatiis, DBuckley, CHutchings, LVisible craze initiation stress has been measured for a wide range of linear and branched monodisperse polystyrenes (PS) soaked in diethylene glycol. Results show that, for a given time under stress, craze initiation in linear PS is disentanglement-dominated below a critical molar mass and chain scission-dominated above it. Branched monodisperse PS behaves similarly, with the relevant molar mass in this case being the span molar mass. Disentanglement craze initiation stress is found to vary linearly with log molar mass and log time. These observations can be explained in terms of Eyring-type stress acceleration of the process of chain retraction, required to achieve me entanglement loss necessary for creation of craze fibril surfaces. A single effective activation volume of 1.8 nm3 accounts for the dependence of crazing stress on molar mass, time, and temperature under uniaxial tensile stress, both as observed in the present data and in a previous study of rate/temperature dependence. © 2008 American Chemical Society. |
| spellingShingle | De Focatiis, D Buckley, C Hutchings, L Roles of chain length, chain architecture, and time in the initiation of visible crazes in polystyrene |
| title | Roles of chain length, chain architecture, and time in the initiation of visible crazes in polystyrene |
| title_full | Roles of chain length, chain architecture, and time in the initiation of visible crazes in polystyrene |
| title_fullStr | Roles of chain length, chain architecture, and time in the initiation of visible crazes in polystyrene |
| title_full_unstemmed | Roles of chain length, chain architecture, and time in the initiation of visible crazes in polystyrene |
| title_short | Roles of chain length, chain architecture, and time in the initiation of visible crazes in polystyrene |
| title_sort | roles of chain length chain architecture and time in the initiation of visible crazes in polystyrene |
| work_keys_str_mv | AT defocatiisd rolesofchainlengthchainarchitectureandtimeintheinitiationofvisiblecrazesinpolystyrene AT buckleyc rolesofchainlengthchainarchitectureandtimeintheinitiationofvisiblecrazesinpolystyrene AT hutchingsl rolesofchainlengthchainarchitectureandtimeintheinitiationofvisiblecrazesinpolystyrene |