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Showing 1 to 6 of 6 for “"polyamic acid"”.
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An Investigation of the Structure-Property Relationships for High Performance Thermoplastic Matrix, Carbon Fiber Composites with a Tailored Polyimide Interphase
… which were made from various water soluble polyamic acid salts were studied. The molecular weight of the polyimides was shown to be dependant upon the selection of the base used for making the polyamic acid salt. The development of an Ultem-type polyimide with controlled molecular weight and …
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A study of polyimide films modified with gold
… these materials are produced by heating a polyamic acid solution which contains a soluble metal salt. While the electrical and thermal properties of some of these films have been studied in great detail, little is known about the factors which control the ultimate distribution of metal in …
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The effects of polymeric binders on the processability and properties of composites made by suspension prepregging
… the addition of 21.3 wt% of imidized LaRC TPI polyamic acid binder at a frequency of 1 Hz. The greatest fiber-matrix adhesion was observed for PEEK composites when BisP BTDA polyamic acid was used as a binder. A preliminary, qualitative study on the possibility of using suspension prepregging …
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Manipulation of Carbon Nanostructures for Multifunctional Composite Materials
… SWCNT fibers. SWCNT fibers were impregnated with polyamic acid (PAA) solution at 100 psi followed by thermal imidization to obtain fibers reinforced with polyimide (PI). The tensile strength was increased form 68 to 215 MPa for SWCNT fibers after VPI and imidization. Surfactant-wrapped chemically …
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Kinetic and mechanistic investigations of polyimide formation and characterization of their blends with polybenzimidazoles
… quantitative non-aqueous titration of the amic acid functional groups as a function of reaction conditions. The homogeneous solution imidization processes were described by auto-acid catalyzed second order kinetics. The effects of heteroatom bridging groups in the diamines and dianhydrides on …
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Electrospun Nanofiber Reinforced Composites: Fabrication and Properties
… difference between PI and its precursor, polyamic acid (PAA) provided the opportunity to prepare self-reinforced composites. As compared to using PI nanofiber mats as reinforcement, the short PI nanofiber reinforced PI composites showed better mechanical properties due to the much better …