Abstract
The plane stress fracture toughness of amorphous copolyester (PETG) sheets plasticized by various amount of neopentylglycol dibenzoate (NPGDB in 0, 5, 10 and 20 wt%) was studied in as-received (AR) and rejuvenated (RJ) states by adopting the essential work of fracture (EWF) method. EWF tests were performed on deeply double-edge notched tensile loaded (DDEN-T) specimens at various deformation rates (2,10 and 100 mm/min) at room temperature. It was established that physical aging strongly affected the EWF terms. The specific yielding-related EWF increased with increasing deformation rate and decreased with increasing plasticizer content. The specific non-essential work and its necking-related constituent, which changed parallel to each other, remained constant up to 10 wt% NPGDB content and decreased afterwards. The plastic zone in the DDEN-T specimens was formed by cold drawing which is governed by the entanglement structure. This This was demonstrated by the shape recovery of the plastic zone in the broken DDEN-T specimens after heating them above the T g of the related PETG compound.
| Original language | English |
|---|---|
| Pages (from-to) | 5691-5699 |
| Number of pages | 9 |
| Journal | Polymer (United Kingdom) |
| Volume | 44 |
| Issue number | 19 |
| DOIs | |
| Publication status | Published - Aug 21 2003 |
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Keywords
- Amorphous copolyester
- Essential work of fracture (EWF)
- Plasticizer
ASJC Scopus subject areas
- Organic Chemistry
- Polymers and Plastics
Cite this
Plane stress fracture toughness of physically aged plasticized PETG as assessed by the essential work of fracture (EWF) method. / Karger-Kocsis, J.; Bárány, T.; Moskala, E. J.
In: Polymer (United Kingdom), Vol. 44, No. 19, 21.08.2003, p. 5691-5699.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Plane stress fracture toughness of physically aged plasticized PETG as assessed by the essential work of fracture (EWF) method
AU - Karger-Kocsis, J.
AU - Bárány, T.
AU - Moskala, E. J.
PY - 2003/8/21
Y1 - 2003/8/21
N2 - The plane stress fracture toughness of amorphous copolyester (PETG) sheets plasticized by various amount of neopentylglycol dibenzoate (NPGDB in 0, 5, 10 and 20 wt%) was studied in as-received (AR) and rejuvenated (RJ) states by adopting the essential work of fracture (EWF) method. EWF tests were performed on deeply double-edge notched tensile loaded (DDEN-T) specimens at various deformation rates (2,10 and 100 mm/min) at room temperature. It was established that physical aging strongly affected the EWF terms. The specific yielding-related EWF increased with increasing deformation rate and decreased with increasing plasticizer content. The specific non-essential work and its necking-related constituent, which changed parallel to each other, remained constant up to 10 wt% NPGDB content and decreased afterwards. The plastic zone in the DDEN-T specimens was formed by cold drawing which is governed by the entanglement structure. This This was demonstrated by the shape recovery of the plastic zone in the broken DDEN-T specimens after heating them above the T g of the related PETG compound.
AB - The plane stress fracture toughness of amorphous copolyester (PETG) sheets plasticized by various amount of neopentylglycol dibenzoate (NPGDB in 0, 5, 10 and 20 wt%) was studied in as-received (AR) and rejuvenated (RJ) states by adopting the essential work of fracture (EWF) method. EWF tests were performed on deeply double-edge notched tensile loaded (DDEN-T) specimens at various deformation rates (2,10 and 100 mm/min) at room temperature. It was established that physical aging strongly affected the EWF terms. The specific yielding-related EWF increased with increasing deformation rate and decreased with increasing plasticizer content. The specific non-essential work and its necking-related constituent, which changed parallel to each other, remained constant up to 10 wt% NPGDB content and decreased afterwards. The plastic zone in the DDEN-T specimens was formed by cold drawing which is governed by the entanglement structure. This This was demonstrated by the shape recovery of the plastic zone in the broken DDEN-T specimens after heating them above the T g of the related PETG compound.
KW - Amorphous copolyester
KW - Essential work of fracture (EWF)
KW - Plasticizer
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U2 - 10.1016/S0032-3861(03)00590-1
DO - 10.1016/S0032-3861(03)00590-1
M3 - Article
VL - 44
SP - 5691
EP - 5699
JO - Polymer
JF - Polymer
SN - 0032-3861
IS - 19
ER -