Polycarbonate and co-continuous polycarbonate/ABS blends: influence of notch radius

J.P.F. Inberg, R.J. Gaymans

Research output: Contribution to journalArticleAcademicpeer-review

26 Citations (Scopus)

Abstract

The influence of notch tip radius in the range of 1–0.002 mm was studied on polycarbonate (PC) and co-continuous PC/acrylonitrile–butadiene–styrene (ABS). Co-continuous PC/ABS blend was obtained by mixing PC and ABS containing 15% polybutadiene (PB) in a twin screw extruder. PC and PC/ABS specimens were injection moulded into test bars. A notch was milled-in, with notch tip radius of 1, 0.5, 0.25 and 0.1 mm. Very sharp notches with a radius of 0.015–0.002 mm were obtained with an Excimer LAZER. The specimens were tested by single edge notch tensile tests at 1 m/s (apparent strain rate 28.5 s−1) and at different temperatures (−60 to 130 °C). Initiation and propagation phases of the fracture process were monitored and the brittle–ductile transition temperature (Tbd) determined. It appeared that the amount of deformation in the initiation phase of fracture was extremely sensitive to notch tip radius. Temperature measurements of the deformation zone showed that the size of the deformation zone decreased with decreasing notch radius. The Tbd of PC increased rapidly with decreasing notch radius, until the glass transition temperature was approached. Remarkably, for PC the notch sensitivity was strongest around the standard notch tip radius of 0.25 mm. This means that a small deviation of this standard notch leads to large deviations in the results. The PC/ABS blend was much less sensitive to notch tip radius and the Tbd was almost constant. Thus the sensitivity of PC to sharp defects can be neutralised by adding ABS.
Original languageUndefined
Pages (from-to)4197-4205
JournalPolymer
Volume43
Issue number15
DOIs
Publication statusPublished - 2002

Keywords

  • Polycarbonate
  • IR-74853
  • METIS-211106
  • Notch radius
  • Co-continuous blends

Cite this

Inberg, J.P.F. ; Gaymans, R.J. / Polycarbonate and co-continuous polycarbonate/ABS blends: influence of notch radius. In: Polymer. 2002 ; Vol. 43, No. 15. pp. 4197-4205.
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abstract = "The influence of notch tip radius in the range of 1–0.002 mm was studied on polycarbonate (PC) and co-continuous PC/acrylonitrile–butadiene–styrene (ABS). Co-continuous PC/ABS blend was obtained by mixing PC and ABS containing 15{\%} polybutadiene (PB) in a twin screw extruder. PC and PC/ABS specimens were injection moulded into test bars. A notch was milled-in, with notch tip radius of 1, 0.5, 0.25 and 0.1 mm. Very sharp notches with a radius of 0.015–0.002 mm were obtained with an Excimer LAZER. The specimens were tested by single edge notch tensile tests at 1 m/s (apparent strain rate 28.5 s−1) and at different temperatures (−60 to 130 °C). Initiation and propagation phases of the fracture process were monitored and the brittle–ductile transition temperature (Tbd) determined. It appeared that the amount of deformation in the initiation phase of fracture was extremely sensitive to notch tip radius. Temperature measurements of the deformation zone showed that the size of the deformation zone decreased with decreasing notch radius. The Tbd of PC increased rapidly with decreasing notch radius, until the glass transition temperature was approached. Remarkably, for PC the notch sensitivity was strongest around the standard notch tip radius of 0.25 mm. This means that a small deviation of this standard notch leads to large deviations in the results. The PC/ABS blend was much less sensitive to notch tip radius and the Tbd was almost constant. Thus the sensitivity of PC to sharp defects can be neutralised by adding ABS.",
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Polycarbonate and co-continuous polycarbonate/ABS blends: influence of notch radius. / Inberg, J.P.F.; Gaymans, R.J.

In: Polymer, Vol. 43, No. 15, 2002, p. 4197-4205.

Research output: Contribution to journalArticleAcademicpeer-review

TY - JOUR

T1 - Polycarbonate and co-continuous polycarbonate/ABS blends: influence of notch radius

AU - Inberg, J.P.F.

AU - Gaymans, R.J.

PY - 2002

Y1 - 2002

N2 - The influence of notch tip radius in the range of 1–0.002 mm was studied on polycarbonate (PC) and co-continuous PC/acrylonitrile–butadiene–styrene (ABS). Co-continuous PC/ABS blend was obtained by mixing PC and ABS containing 15% polybutadiene (PB) in a twin screw extruder. PC and PC/ABS specimens were injection moulded into test bars. A notch was milled-in, with notch tip radius of 1, 0.5, 0.25 and 0.1 mm. Very sharp notches with a radius of 0.015–0.002 mm were obtained with an Excimer LAZER. The specimens were tested by single edge notch tensile tests at 1 m/s (apparent strain rate 28.5 s−1) and at different temperatures (−60 to 130 °C). Initiation and propagation phases of the fracture process were monitored and the brittle–ductile transition temperature (Tbd) determined. It appeared that the amount of deformation in the initiation phase of fracture was extremely sensitive to notch tip radius. Temperature measurements of the deformation zone showed that the size of the deformation zone decreased with decreasing notch radius. The Tbd of PC increased rapidly with decreasing notch radius, until the glass transition temperature was approached. Remarkably, for PC the notch sensitivity was strongest around the standard notch tip radius of 0.25 mm. This means that a small deviation of this standard notch leads to large deviations in the results. The PC/ABS blend was much less sensitive to notch tip radius and the Tbd was almost constant. Thus the sensitivity of PC to sharp defects can be neutralised by adding ABS.

AB - The influence of notch tip radius in the range of 1–0.002 mm was studied on polycarbonate (PC) and co-continuous PC/acrylonitrile–butadiene–styrene (ABS). Co-continuous PC/ABS blend was obtained by mixing PC and ABS containing 15% polybutadiene (PB) in a twin screw extruder. PC and PC/ABS specimens were injection moulded into test bars. A notch was milled-in, with notch tip radius of 1, 0.5, 0.25 and 0.1 mm. Very sharp notches with a radius of 0.015–0.002 mm were obtained with an Excimer LAZER. The specimens were tested by single edge notch tensile tests at 1 m/s (apparent strain rate 28.5 s−1) and at different temperatures (−60 to 130 °C). Initiation and propagation phases of the fracture process were monitored and the brittle–ductile transition temperature (Tbd) determined. It appeared that the amount of deformation in the initiation phase of fracture was extremely sensitive to notch tip radius. Temperature measurements of the deformation zone showed that the size of the deformation zone decreased with decreasing notch radius. The Tbd of PC increased rapidly with decreasing notch radius, until the glass transition temperature was approached. Remarkably, for PC the notch sensitivity was strongest around the standard notch tip radius of 0.25 mm. This means that a small deviation of this standard notch leads to large deviations in the results. The PC/ABS blend was much less sensitive to notch tip radius and the Tbd was almost constant. Thus the sensitivity of PC to sharp defects can be neutralised by adding ABS.

KW - Polycarbonate

KW - IR-74853

KW - METIS-211106

KW - Notch radius

KW - Co-continuous blends

U2 - 10.1016/S0032-3861(02)00220-3

DO - 10.1016/S0032-3861(02)00220-3

M3 - Article

VL - 43

SP - 4197

EP - 4205

JO - Polymer

JF - Polymer

SN - 0032-3861

IS - 15

ER -