NDLI: Effect of Pre-Melting Time on Crystallization of Poly(ethylene terephthalate)

Content Provider	Springer Nature Link
Author	Hsu, Ghia Huei Yang, Yu Ning Yu, T. Leon Lin, Hsiu Li
Copyright Year	2006
Abstract	In this study poly(ethylene terephthalate) (PET) was melted at 300°C, approximately 46°C above the crystalline melting point, T $_{m}$, for different times, i.e., Δt $_{m}$,=5, 8, and 10 min, and then quenched to different isothermal crystallization temperatures, T $_{c}$, ranging from 190°C to 230°C. The effect of pre-melting time, Δt $_{m}$, at 300°C on the degree of crystallinity and on crystalline morphology were investigated by differential scanning calorimetry (DSC) and polarized-light microscopy (PLM). After crystallization at low T $_{c}$, PLM data revealed the PET contained usual, positive, and unringed spherulites. After crystallization at high T $_{c}$ PET contained unusual, ringed, and double-extinction spherulites. The experimental results reveal that increasing the pre-melting time Δt $_{m}$ at 300°C causes an increment in T $_{c}$ for usual–unusual, unringed–ringed, and positive–double-extinction transitions of the PET spherulites. The experimental results also show that PET with a pre-melting time Δt $_{m}$=8 min had higher crystallinity than those with pre-melting times Δt $_{m}$=5 and 10 min. These crystallization phenomena were attributed to the different numbers of residual unmelted PET crystallites as a result of the variation in pre-melting time, Δt $_{m}$, at 300°C.
Starting Page	361
Ending Page	368
Page Count	8
File Format	PDF
ISSN	10229760
Journal	Journal of Polymer Research
Volume Number	13
Issue Number	5
e-ISSN	15728935
Language	English
Publisher	Springer Netherlands
Publisher Date	2006-03-14
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	differential scanning calorimetry crystallization polarized-light microscopy poly(ethylene terephthalate) Characterization and Evaluation of Materials Industrial Chemistry/Chemical Engineering Polymer Sciences
Content Type	Text
Resource Type	Article
Subject	Organic Chemistry Materials Chemistry Polymers and Plastics

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