Hoerbiger Corporation of America

Houston, TX, United States

Hoerbiger Corporation of America

Houston, TX, United States

Time filter

Source Type

Liu P.,Texas A&M University | Mullins M.,Texas A&M University | Bremner T.,Hoerbiger Corporation of America | Sue H.-J.,Texas A&M University
Annual Technical Conference - ANTEC, Conference Proceedings | Year: 2016

The objective of this work is to investigate the degradation mechanisms and property changes of a blend of poly (etheretherketone) (PEEK) with poly [2, 2'-(m-phenylene-5, 5'-bibenzimidazole] (PBI) upon exposure to water at temperatures up to 288 °C. The molecular scale damping behavior of PEEK/PBI blend was probed using dynamic mechanical analysis (DMA). Atomic Force Microscopy based nanomechanical mapping has been used to assess the moduli profile near the interface of PEEK and PBI with various environmental exposure histories. The results demonstrate that the incorporation of water influences the compatibility behavior of PEEK and PBI through enhanced interfacial adhesion. Fracture toughness of the PEEK/PBI blend is significantly reduced by hot water exposure at 288 °C.


White K.L.,Texas A&M University | Jin L.,Texas A&M University | Ferrer N.,University of Massachusetts Amherst | Wong M.,Texas A&M University | And 2 more authors.
Polymer Engineering and Science | Year: 2013

The mechanical properties and thermal stability of several grades of poly(aryletherketone)s (PAEKs) were investigated using thermal, rheological, and dynamic mechanical characterization. Detailed rheological characterization revealed that several grades of poly(etheretherketone) (PEEK) exhibit relaxation behavior characteristic of a long-chain branched structure. The potentially branched PEEKs showed greater mechanical damping behavior than the linear-chain PEEKs. The molecular weight dependence on zero-shear viscosity for several linear-chain polymers indicates that the PEEKs behave as rigid chains in the melt. Differences in chain structure do not significantly influence dynamic mechanical behavior in the solid state but affect stability at elevated temperatures. The potentially branched PEEKs are most susceptible to oxidation in air, but exhibit much greater stability in nitrogen. Poly(etherketone) is highly susceptible to degradation in both air and nitrogen environments. Implications of this study for development of high-performance PAEKs are discussed. © 2012 Society of Plastics Engineers.


Jin L.,Texas A&M University | Ball J.,Texas A&M University | Bremner T.,Hoerbiger Corporation of America | Sue H.-J.,Texas A&M University
Polymer (United Kingdom) | Year: 2014

The crystal structure and morphology of poly(ether ether ketone) (PEEK) was investigated using standard differential scanning calorimetry (DSC), flash DSC, optical microscopy, atomic force microscopy, and small angle X-ray scattering tools. The flash DSC results suggested that the double melting peaks phenomenon observed in conventional DSC work originated from the reorganization of PEEK crystals, which was due to the much faster recrystallization rate of PEEK than the DSC heating and cooling rate. A refined crystallization model to describe PEEK crystal structure formation was proposed. The refined crystallization model could help reconcile the discrepancy found between the bulk crystallinity measured by DSC and the linear crystallinity obtained from SAXS experiments by taking into account possible variation in crystal perfection within the lamellar structure. Simplified molecular dynamic modeling was carried out to support this model. Implications of the above findings to the fundamental understanding of structure-property relationships in PEEK were discussed. © 2014 Elsevier Ltd. All rights reserved.


Jin L.,Texas A&M University | Ball J.,Texas A&M University | Bremner T.,Hoerbiger Corporation of America | Sue H.-J.,Texas A&M University
Annual Technical Conference - ANTEC, Conference Proceedings | Year: 2013

The crystal structure of poly(ether ether ketone) (PEEK) has been investigated by thermal and morphological characterizations. Spherulites and lamellar structures are revealed by optical microscopy, atomic force microscopy, transmission electron microscopy and small angle X-ray scattering. A refined crystalline model is proposed to describe lamellae formation in PEEK.


Pope J.C.,Texas A&M University | Sue H.-J.,Texas A&M University | Bremner T.,Texas A&M University | Bremner T.,Hoerbiger Corporation of America | Blumel J.,Texas A&M University
Journal of Applied Polymer Science | Year: 2015

Blends of polyaryletherketones (PAEK), such as polyetheretherketones (PEEK) and polyetherketoneketones (PEKK), with polybenzimidazole (PBI) are of commercial interest due to their improved high-temperature stability and wear properties. The changes of PBI and its PEEK- and PEKK-blends (50: 50 wt %) after immersing them in liquid H2O and D2O, and exposing them to D2O steam at elevated temperatures and pressures are investigated by multinuclear solid-state NMR and IR spectroscopy. Macroscopic morphological and chemical changes on the molecular scale, which take place upon high-temperature steam-treatment and the extent and reversibility of moisture uptake have been investigated. Interactions and reactions of water, steam, and aqueous solutions of LiCl and ZnBr2 with the functional groups of the polymer components have been studied using D2O in combination with IR, 1H wideline, 2H, 7Li, and 79Br MAS, as well as 13C and 15N CP/MAS NMR spectroscopy. Different locations and types of water and protons in the blends have been described and PBI has been proven to be mainly responsible for water and salt uptake into the blends. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015, 132, 41421. © 2014 Wiley Periodicals, Inc.


Laux K.A.,Texas A&M University | Sue H.J.,Texas A&M University | Montoya A.,Texas A&M University | Bremner T.,Hoerbiger Corporation of America
Tribology Letters | Year: 2015

Abstract The polyaryletherketone (PAEK) family of thermoplastics is increasingly used in engineering applications that require outstanding tribological properties. Considerable attention has thus been paid to their wear behavior in a number of environments. However, little focus has been given to PAEK response to fretting conditions. Fretting wear results from the repeated slip of mutually loaded contacts. In this study, a custom built multi-axis tribometer has been shown to replicate fretting of PAEK in a pin-on-flat configuration. The experimentation and analysis has provided new insights into this phenomenon. © Springer Science+Business Media New York 2015.


Guenther J.,Texas A&M University | Wong M.,Texas A&M University | Sue H.-J.,Texas A&M University | Bremner T.,Texas A&M University | And 2 more authors.
Journal of Applied Polymer Science | Year: 2013

Blends of polyaryletherketones (PAEK) with polybenzimidazole (PBI) are of commercial interest due to their improved upper service temperatures and wear properties when compared with the PAEK analogs examined to date. The retention of properties of the PBI component generally thought to be disadvantageous in more thermally or chemically aggressive environments is not well understood, nor are the specifics of interactions between the PBI and PAEK components in a melt or dry blend systems. In this initial investigation, focus is placed on the behavior and mechanism of polyetherketoneketone (PEKK)/PBI systems in contact with steam or condensed phase water. The goal is to understand the chemistry of the reaction, if any, upon exposure to steam as well as to examine the reversibility of moisture uptake of this material when exposed to liquid water or saturated steam. In this contribution, the pure polymer components and the PEKK-PBI (60: 40 wt %) blend are steam-treated at 149°C (300°F) and 316°C (600°F). IR and solid-state NMR spectroscopy are used to study chemical or morphological transformations of the polymers. All changes detectable by 13C cross-polarization with magic angle spinning (CP/MAS) upon steam-treatment are reversible, and not of a chemical nature, indicating that under the conditions of exposure used here no detectable chemical degradation occurs during steam exposure and with moisture uptake. The temporary water uptake of the samples, as studied by 1H wideline NMR and 13C T1 time measurements, leads to a change in the ratio of rigid versus mobile domains of the materials. © 2012 Wiley Periodicals, Inc.


Pope J.C.,Texas A&M University | Sue H.-J.,Texas A&M University | Bremner T.,Texas A&M University | Bremner T.,Hoerbiger Corporation of America | Blumel J.,Texas A&M University
Polymer (United Kingdom) | Year: 2014

Polyaryletherketones (PAEK) in blend systems with polybenzimidazoles (PBI) are of commercial interest due to their increased service temperature and reduction in abrasive wear against soft counterfaces when compared to PAEK alone. ASTM standard tensile specimens of PBI, polyetheretherketone (PEEK) and polyetherketoneketone (PEKK) are immersed in stirred D2O at room temperature, and additional samples are contacted with D2O steam at temperatures of 150 and 315 °C. All samples are studied by TGA, IR, 13C CP/MAS, 1H wideline, and 2H MAS NMR. Changes in the physical appearance of the samples and the extent of D 2O uptake are described. Different locations, mobilities, and types of water and protons in the polymers are identified and studied and it is proven that PBI contains the largest amounts of D2O after exposure under all conditions. PEEK and PEKK only incorporate minimal amounts of D2O even when steam-treated at 315 °C. © 2014 Elsevier Ltd. All rights reserved.


Laux K.A.,Texas A&M University | Sue H.J.,Texas A&M University | Bremner T.,Hoerbiger Corporation of America
Annual Technical Conference - ANTEC, Conference Proceedings | Year: 2014

Fretting is said to occur when mutually loaded contacts move relative to one another with nominally small displacements. The resulting stick slip between asperities causes cracks to nucleate at the surface and may eventually lead to catastrophic part failure. Furthermore, prediction of how a material might respond to such a scenario is challenging due the overall complexity of the process. The polyaryletherketone (PAEK) family of thermoplastics has been increasingly used in such fretting environments, but few studies exist regarding their fretting behavior. In this study, a custom built multi-axis tribometer has been shown to replicate fretting of PAEK in a pin on flat configuration. The experimentation and analysis has provided new insights into this phenomenon. Copyright © (2014) by the Society of Plastics Engineers All rights reserved.


Jin L.,Texas A&M University | Sengupta J.,Hoerbiger Corporation of America | Bremner T.,Texas A&M University | Sue H.-J.,Texas A&M University
Annual Technical Conference - ANTEC, Conference Proceedings | Year: 2014

Cylindrical parts were compression-molded using polyetheretherketone (PEEK) fine powder. Post-molding thermal stress relief was executed through systematic variations in time and temperature cycles. Following stress relief, washers were cut from the cylindrical stock shapes and used in the analysis of residual stress. Quantitative determination of the residual stresses along the circumferential direction was carried out based on displacement data obtained by a ring slitting and layer removal method. Thermal and morphological properties of the material were characterized, and their relationship with the residual stress distribution in the material is discussed.

Loading Hoerbiger Corporation of America collaborators
Loading Hoerbiger Corporation of America collaborators