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Optimizing physical aging in poly(ethylene terephthalate)-glycol (PETG)
Guo J; Xiao R; Tian CS; Jiang MQ(蒋敏强)
AbstractAmorphous glassy polymers are widely used as structural materials. However, their mechanical properties continuously evolve with physical aging, which significantly influences their applications. In this work, we investigate the effects of aging on stress response of poly(ethylene terephthalate)-glycol (PETG). The PETG specimens are either quenched or annealed around or below the glass transition temperature (T-g) for a period of time. The uniaxial compression tests are then performed at T-g-40 degrees C and strain rate 0.001/s. The quenched polymers exhibit the smallest yield strength and strain softening, indicating that negligible structural relaxation occurs for the quenched condition. For annealed polymers, the yield strength increases with aging time. The results also show that there exists an optimal temperature to achieve the highest structural relaxation rate, which is around Tg-20 degrees C. Compared with annealing at a single temperature, annealing at multiple temperatures in discrete steps is a more efficient method for structural relaxation. The same experiments are also performed on specimens with 30% predeformation. The optimal aging temperature does not change with predeformation. However, at the same annealing condition the yield strength of specimens with 30% predeformation is around 5 MPa less than that of undeformed specimens.
KeywordPhysical aging Structural relaxation PETG
Indexed BySCI ; EI
WOS IDWOS:000450380000003
WOS Research AreaMaterials Science, Ceramics ; Materials Science, Multidisciplinary
WOS SubjectMaterials Science
Funding OrganizationNational Natural Science Foundation of China [11872170, 11522221] ; Fundamental Research Funds for Central Universities, Hohai University [2016B01414] ; Opening Fund of State Key Laboratory of Nonlinear Mechanics
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Cited Times:5[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Affiliation1.Hohai Univ, Dept Engn Mech, Coll Mech & Mat, Nanjing 210098, Jiangsu, Peoples R China
2.Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100190, Peoples R China
3.Univ Chinese Acad Sci, Sch Engn Sci, Beijing 101408, Peoples R China
Recommended Citation
GB/T 7714
Guo J,Xiao R,Tian CS,et al. Optimizing physical aging in poly(ethylene terephthalate)-glycol (PETG)[J]. JOURNAL OF NON-CRYSTALLINE SOLIDS,2018,502:15-21.
APA Guo J,Xiao R,Tian CS,&蒋敏强.(2018).Optimizing physical aging in poly(ethylene terephthalate)-glycol (PETG).JOURNAL OF NON-CRYSTALLINE SOLIDS,502,15-21.
MLA Guo J,et al."Optimizing physical aging in poly(ethylene terephthalate)-glycol (PETG)".JOURNAL OF NON-CRYSTALLINE SOLIDS 502(2018):15-21.
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