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Title: Interfacial Phenomena and Mechanical Behavior of Polyetheretherketone/Polybenzimidazole Blend under Hygrothermal Environment

Journal Article · · Journal of Physical Chemistry. B
ORCiD logo [1];  [2];  [3];  [2]; ORCiD logo [4]
  1. Texas A&M Univ., College Station, TX (United States). Dept. of Mechanical Engineering
  2. Texas A&M Univ., College Station, TX (United States). Dept. of Materials Science and Engineering, Polymer Technology Center
  3. Hoerbiger Corporation of America, Inc., Houston, TX (United States)
  4. Texas A&M Univ., College Station, TX (United States). Dept. of Mechanical Engineering; Texas A&M Univ., College Station, TX (United States). Dept. of Materials Science and Engineering, Polymer Technology Center

Demands for engineering applications of high performance polymers, such as the polyaryletherketone families, have grown significantly in recent years. Fundamental knowledge on the mechanical behavior of such polymers, especially under harsh environments, is still lacking. In this study, the mechanical behavior and interfacial phenomena of a blend of polybenzimidazole (PBI) particles having sizes of about 50 μm and polyetheretherketone (PEEK) matrix at 50:50 weight ratio was characterized. PBI and PEEK are known to be incompatible with each other in the dry state. The possible influence of hygrothermal exposure on interfacial bonding between PEEK and PBI has been systematically studied. Under dry conditions, the PEEK matrix dominates the dynamic mechanical behavior, indicating no noticeable viscoelastic coupling between the two phases. After being exposed to hygrothermal conditions, the Tg of the PEEK phase in the blend shifts to a lower temperature by as much as 26 °C. The extent of this shift is much greater than what is observed for neat PEEK alone under the same condition. Nanomechanical property mapping results indicate that the interfacial region is broadened after 288 °C hot water immersion treatment. The above finding strongly suggests the hygrothermal conditioning promotes apparent compatibility between PEEK and PBI. Likewise, the fracture behavior of the blend provides direct evidence that the interfacial adhesion is greater than the cohesive strength of either phase after water immersion. In the meantime, it is found that both fracture toughness and tensile strength of the blend are improved by water absorption at 60 °C, at the expense of a minor reduction in Young’s modulus. However, if the blend is exposed to hot water at 288 °C, all of the mechanical properties will deteriorate significantly. In conclusion, the possible causes of the mechanical property deterioration in the PEEK/PBI blend after hygrothermal treatment are discussed.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE; US Department of the Interior
Grant/Contract Number:
AC05-00OR22725; E14AC00001
OSTI ID:
1394554
Journal Information:
Journal of Physical Chemistry. B, Vol. 121, Issue 21; ISSN 1520-6106
Publisher:
American Chemical SocietyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 15 works
Citation information provided by
Web of Science

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