Abstract
High Tg amorphous copolyester thermoplastics were synthesized by incorporating 4,4′-bibenzoate (4,4′BB) and 3,4′-bibenzoate moieties into the polyester backbone via melt polycondensation. The high levels of crystallinity typically associated with 4,4′BB containing polyesters were suppressed through copolymerization of ethylene glycol, 1,4-cyclohexane dimethanol, and neopentyl glycol (NPG) diols. NPG was shown to be highly effective in suppressing crystallization and was used to produce amorphous compositions with Tg’s as high as 129 °C. Diol ratios were determined by 1H NMR spectroscopy and molecular weights were assessed with inherent viscosity (ηinh). Thermogravimetric analysis showed single-step weight losses in the range of 395–419 °C. Differential scanning calorimetry was used to determine melting points and glass transition temperatures over a wide range of copolyester compositions and identified amorphous compositions. Dynamic mechanical analysis confirmed Tg’s and was used to study β-relaxations below the Tg. Rheological analysis revealed the effect of NPG structures on shear thinning and thermal stability.
| Original language | English |
|---|---|
| Journal | Journal of Polymer Science, Part A: Polymer Chemistry |
| DOIs | |
| Publication status | Accepted/In press - 2018 Jan 1 |
| Externally published | Yes |
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Keywords
- amorphous
- bibenzoate
- calorimetry
- cyclohexanedimethanol
- neopentyl glycol
- polyester
- rheology
ASJC Scopus subject areas
- Polymers and Plastics
- Organic Chemistry
- Materials Chemistry
Cite this
Amorphous copolyesters based on bibenzoic acids and neopentyl glycol. / Eliot Edling, Hans; Mondschein, Ryan J.; Davis, Mark K.; Long, Timothy Edward; Richard Turner, Sam.
In: Journal of Polymer Science, Part A: Polymer Chemistry, 01.01.2018.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Amorphous copolyesters based on bibenzoic acids and neopentyl glycol
AU - Eliot Edling, Hans
AU - Mondschein, Ryan J.
AU - Davis, Mark K.
AU - Long, Timothy Edward
AU - Richard Turner, Sam
PY - 2018/1/1
Y1 - 2018/1/1
N2 - High Tg amorphous copolyester thermoplastics were synthesized by incorporating 4,4′-bibenzoate (4,4′BB) and 3,4′-bibenzoate moieties into the polyester backbone via melt polycondensation. The high levels of crystallinity typically associated with 4,4′BB containing polyesters were suppressed through copolymerization of ethylene glycol, 1,4-cyclohexane dimethanol, and neopentyl glycol (NPG) diols. NPG was shown to be highly effective in suppressing crystallization and was used to produce amorphous compositions with Tg’s as high as 129 °C. Diol ratios were determined by 1H NMR spectroscopy and molecular weights were assessed with inherent viscosity (ηinh). Thermogravimetric analysis showed single-step weight losses in the range of 395–419 °C. Differential scanning calorimetry was used to determine melting points and glass transition temperatures over a wide range of copolyester compositions and identified amorphous compositions. Dynamic mechanical analysis confirmed Tg’s and was used to study β-relaxations below the Tg. Rheological analysis revealed the effect of NPG structures on shear thinning and thermal stability.
AB - High Tg amorphous copolyester thermoplastics were synthesized by incorporating 4,4′-bibenzoate (4,4′BB) and 3,4′-bibenzoate moieties into the polyester backbone via melt polycondensation. The high levels of crystallinity typically associated with 4,4′BB containing polyesters were suppressed through copolymerization of ethylene glycol, 1,4-cyclohexane dimethanol, and neopentyl glycol (NPG) diols. NPG was shown to be highly effective in suppressing crystallization and was used to produce amorphous compositions with Tg’s as high as 129 °C. Diol ratios were determined by 1H NMR spectroscopy and molecular weights were assessed with inherent viscosity (ηinh). Thermogravimetric analysis showed single-step weight losses in the range of 395–419 °C. Differential scanning calorimetry was used to determine melting points and glass transition temperatures over a wide range of copolyester compositions and identified amorphous compositions. Dynamic mechanical analysis confirmed Tg’s and was used to study β-relaxations below the Tg. Rheological analysis revealed the effect of NPG structures on shear thinning and thermal stability.
KW - amorphous
KW - bibenzoate
KW - calorimetry
KW - cyclohexanedimethanol
KW - neopentyl glycol
KW - polyester
KW - rheology
UR - http://www.scopus.com/inward/record.url?scp=85058983732&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85058983732&partnerID=8YFLogxK
U2 - 10.1002/pola.29296
DO - 10.1002/pola.29296
M3 - Article
JO - Journal of Polymer Science, Part A: Polymer Chemistry
JF - Journal of Polymer Science, Part A: Polymer Chemistry
SN - 0887-624X
ER -