The effect of water absorption on stretch-induced crystallization of poly(ethylene terephthalate): An in-situ synchrotron radiation wide angle X-ray scattering study

The structural evolution of poly (ethylene terephthalate) (PET) with distinct water absorption during uniaxial deformation slightly above glass transition temperature (Tg) were investigated by in-situ synchrotron radiation wide angle X-ray scattering (WAXS). Results show that the locally ordered str...

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Bibliographic Details
Published in:Polymer (Guilford) 2019-01, Vol.162, p.91-99
Main Authors: Zhang, Wenwen, Yan, Qi, Ye, Ke, Zhang, Qianlei, Chen, Wei, Meng, Lingpu, Chen, Xiaowei, Wang, Daoliang, Li, Liangbin
Format: Article
Language:English
Subjects:
Absorption
Chain mobility
Chains
Crystallization
Crystals
Deformation
Entropy
Ethylene
Glass transition temperature
Mobility
PET
Polyethylene terephthalate
Stretch-induced crystallization
Synchrotron radiation
Transition temperatures
Water absorption
X-ray scattering
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Summary:The structural evolution of poly (ethylene terephthalate) (PET) with distinct water absorption during uniaxial deformation slightly above glass transition temperature (Tg) were investigated by in-situ synchrotron radiation wide angle X-ray scattering (WAXS). Results show that the locally ordered structures are not conducive to stretch-induced crystallization (SIC) although the corresponding entropy is more close to crystals compared to random chains, which is due to the limited chain mobility therein. The “frozen orders” should be destroyed to achieve the critical chain mobility required by SIC even with the presence of water as plasticizer. Unexpectedly, absorption of water does not enhance but suppresses SIC though it does promote the chain mobility, originating from lower stress level with higher water contents. Stress and chain mobility directly correlate with chain stretch and orientation in positive and negative manners, respectively, demonstrating that chain stretch and orientation also play important role in SIC around Tg. [Display omitted] •The structural evolutions of PET samples with different contents of water are investigated with in-situ WAXS.•It is necessary to accumulate sufficient chain mobility for SIC by destroying the frozen orders.•The SIC in PET can be inhibited by water above glass transition temperature.
ISSN:0032-3861
1873-2291
DOI:10.1016/j.polymer.2018.12.029