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Papers by Matthew Clingerman

Research paper thumbnail of Development of Electrically Conductive Nylon 6,6 and High Temperature Nylon

Most polymer resins are thermally and electrically insulating. Increasing the thermal and electri... more Most polymer resins are thermally and electrically insulating. Increasing the thermal and electrical conductivity of these resins opens new markets. In this research, Michigan Technological University (MTU)

Research paper thumbnail of Tensile, Thermal, and Electrical Properties of Carbon Filled Nylon 6,6 Conductive Resins

Research paper thumbnail of Factorial design approach applied to electrically and thermally conductive nylon 6,6

Polymer Composites, 2001

Increasing the thermal and electrical conductivity of typically insulating polymers, such as nylo... more Increasing the thermal and electrical conductivity of typically insulating polymers, such as nylon 6,6, opens new markets. A thermally conductive resin can be used for heat sink applications. An electrically conductive resin can be used in static dissipative and Electromagnetic Interference/Radio Frequency Interference shielding applications. This research focused on performing compounding runs followed by injection molding and testing (tensile properties, volumetric electrical resistivity, and through-plane thermal conductivity) of carbon filled nylon 6,6. The four carbon fillers investigated included a PAN-based carbon fiber (milled, 200p long), an electrically conductive carbon black, vapor grown graphitic nanotubes, and Thermocarb (high quality synthetic milled graphite). Formulations were produced and tested that contained varying amounts of a single carbon filler. Combinations of fillers were also investigated via conducting half of a 24 factorial design. It was determined that Thermocarb has the largest effect on the thermal conductivity. Increasing Thermocarb increases thermal conductivity. For conductive resins containing only a single filler type, nanotubes caused the electrical resistivity (ER) to decrease the most. For the half fraction factorial design formulations that contain at least one filler type at the higher level, the ER of the conductive resin ranged from 0.1 to 0.3 ohm-cm.

Research paper thumbnail of Thermally conductive nylon 6,6 and polycarbonate based resins. I. Synergistic effects of carbon fillers

Journal of Applied Polymer Science, 2003

Increasing the thermal conductivity of typically insulating polymers, such as nylon 6,6, opens ne... more Increasing the thermal conductivity of typically insulating polymers, such as nylon 6,6, opens new markets. A thermally conductive resin can be used for heatsink applications. This research focused on performing compounding runs followed by injection molding and thermal conductivity testing of carbon filled nylon 6,6 and polycarbonate based resins. The three carbon fillers investigated included an electrically conductive carbon black, synthetic graphite particles, and a milled pitch-based carbon fiber. For each polymer, conductive resins were produced and tested that contained varying amounts of these single carbon fillers. In addition, combinations of fillers were investigated by conducting a full 2 3 factorial design and a complete replicate in each polymer. The objective of this article was to determine the effects and interactions of each filler on the thermal conductivity properties of the conductive resins. From the through-plane thermal conductivity results, it was determined that for both nylon 6,6 and polycarbonate based resins, synthetic graphite particles caused the largest increase in composite thermal conductivity, followed by carbon fibers. The combination of synthetic graphite particles and carbon fiber had the third most important effect on composite thermal conductivity.

Research paper thumbnail of Evaluation of electrical conductivity models for conductive polymer composites

Journal of Applied Polymer Science, 2001

The electrical conductivity of polymeric materials can be increased by the addition of carbon fil... more The electrical conductivity of polymeric materials can be increased by the addition of carbon fillers, such as carbon fibers and graphite. The resulting composites could be used in applications such as interference shielding and electrostatic dissipation. Electrical conductivity models are often proposed to predict the conductivity behavior of these materials in order to achieve more efficient material design that could reduce costly experimental work. The electrical conductivity of carbon-filled polymers was studied by adding four single fillers to nylon 6,6 and polycarbonate in increasing concentrations. The fillers used in this project include chopped and milled forms of polyacrylonitrile (PAN) carbon fiber, Thermocarb TM Specialty Graphite, and Ni-coated PAN carbon fiber. Material was extruded and injection-molded into test specimens, and then the electrical conductivity was measured. Data analysis included a comparison of the results to existing conductivity models. The results show that the model proposed by Mamunya, which takes into account the filler aspect ratio and the surface energy of the filler and polymer, most closely matched the conductivity data. This information will then be used in the development of improved conductivity models.

Research paper thumbnail of Development of an additive equation for predicting the electrical conductivity of carbon-filled composites

Journal of Applied Polymer Science, 2003

... Development of an additive equation for predicting the electrical conductivity of carbon-fill... more ... Development of an additive equation for predicting the electrical conductivity of carbon-filled composites. Matthew L. Clingerman 1 ,; Erik H. Weber 1 ,; Julia A. King 1,* ,; Kirk H. Schulz 2. Article first published online: 14 MAR 2003. DOI: 10.1002/app.11938. ...

Research paper thumbnail of Development of Electrically Conductive Nylon 6,6 and High Temperature Nylon

Most polymer resins are thermally and electrically insulating. Increasing the thermal and electri... more Most polymer resins are thermally and electrically insulating. Increasing the thermal and electrical conductivity of these resins opens new markets. In this research, Michigan Technological University (MTU)

Research paper thumbnail of Tensile, Thermal, and Electrical Properties of Carbon Filled Nylon 6,6 Conductive Resins

Research paper thumbnail of Factorial design approach applied to electrically and thermally conductive nylon 6,6

Polymer Composites, 2001

Increasing the thermal and electrical conductivity of typically insulating polymers, such as nylo... more Increasing the thermal and electrical conductivity of typically insulating polymers, such as nylon 6,6, opens new markets. A thermally conductive resin can be used for heat sink applications. An electrically conductive resin can be used in static dissipative and Electromagnetic Interference/Radio Frequency Interference shielding applications. This research focused on performing compounding runs followed by injection molding and testing (tensile properties, volumetric electrical resistivity, and through-plane thermal conductivity) of carbon filled nylon 6,6. The four carbon fillers investigated included a PAN-based carbon fiber (milled, 200p long), an electrically conductive carbon black, vapor grown graphitic nanotubes, and Thermocarb (high quality synthetic milled graphite). Formulations were produced and tested that contained varying amounts of a single carbon filler. Combinations of fillers were also investigated via conducting half of a 24 factorial design. It was determined that Thermocarb has the largest effect on the thermal conductivity. Increasing Thermocarb increases thermal conductivity. For conductive resins containing only a single filler type, nanotubes caused the electrical resistivity (ER) to decrease the most. For the half fraction factorial design formulations that contain at least one filler type at the higher level, the ER of the conductive resin ranged from 0.1 to 0.3 ohm-cm.

Research paper thumbnail of Thermally conductive nylon 6,6 and polycarbonate based resins. I. Synergistic effects of carbon fillers

Journal of Applied Polymer Science, 2003

Increasing the thermal conductivity of typically insulating polymers, such as nylon 6,6, opens ne... more Increasing the thermal conductivity of typically insulating polymers, such as nylon 6,6, opens new markets. A thermally conductive resin can be used for heatsink applications. This research focused on performing compounding runs followed by injection molding and thermal conductivity testing of carbon filled nylon 6,6 and polycarbonate based resins. The three carbon fillers investigated included an electrically conductive carbon black, synthetic graphite particles, and a milled pitch-based carbon fiber. For each polymer, conductive resins were produced and tested that contained varying amounts of these single carbon fillers. In addition, combinations of fillers were investigated by conducting a full 2 3 factorial design and a complete replicate in each polymer. The objective of this article was to determine the effects and interactions of each filler on the thermal conductivity properties of the conductive resins. From the through-plane thermal conductivity results, it was determined that for both nylon 6,6 and polycarbonate based resins, synthetic graphite particles caused the largest increase in composite thermal conductivity, followed by carbon fibers. The combination of synthetic graphite particles and carbon fiber had the third most important effect on composite thermal conductivity.

Research paper thumbnail of Evaluation of electrical conductivity models for conductive polymer composites

Journal of Applied Polymer Science, 2001

The electrical conductivity of polymeric materials can be increased by the addition of carbon fil... more The electrical conductivity of polymeric materials can be increased by the addition of carbon fillers, such as carbon fibers and graphite. The resulting composites could be used in applications such as interference shielding and electrostatic dissipation. Electrical conductivity models are often proposed to predict the conductivity behavior of these materials in order to achieve more efficient material design that could reduce costly experimental work. The electrical conductivity of carbon-filled polymers was studied by adding four single fillers to nylon 6,6 and polycarbonate in increasing concentrations. The fillers used in this project include chopped and milled forms of polyacrylonitrile (PAN) carbon fiber, Thermocarb TM Specialty Graphite, and Ni-coated PAN carbon fiber. Material was extruded and injection-molded into test specimens, and then the electrical conductivity was measured. Data analysis included a comparison of the results to existing conductivity models. The results show that the model proposed by Mamunya, which takes into account the filler aspect ratio and the surface energy of the filler and polymer, most closely matched the conductivity data. This information will then be used in the development of improved conductivity models.

Research paper thumbnail of Development of an additive equation for predicting the electrical conductivity of carbon-filled composites

Journal of Applied Polymer Science, 2003

... Development of an additive equation for predicting the electrical conductivity of carbon-fill... more ... Development of an additive equation for predicting the electrical conductivity of carbon-filled composites. Matthew L. Clingerman 1 ,; Erik H. Weber 1 ,; Julia A. King 1,* ,; Kirk H. Schulz 2. Article first published online: 14 MAR 2003. DOI: 10.1002/app.11938. ...