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Showing 1 to 10 of 10 for “"polyetherimides"”.
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Computational Studies of Polyetherimides: Beyond All-Atom Molecular Dynamics Simulations
Polyetherimides are an important class of engineering thermoplastics used in a broad range of industries and applications because of their high heat resistance and stability, high strength and moduli, excellent electrical properties over a wide range of temperatures and frequencies, good …
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Structure-Property Relationships of Polyester Regioisomers and Pendant Functionalized Polyetherimides
… regioisomers and pendant functionalized polyetherimides (PEI)s. Novel monomers incorporated at targeted mol % produced series of polyesters and PEIs, suitable for systematic analysis of key polymer properties. Subsequent compositional, thermal, mechanical, and rheological characterization …
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End-Group Modified Hyperbranched Polyetherimides and Their Blends With Linear Polymers
When used as a modifier for melt-processed blends, the HBP domain size was based upon end-group composition and Tg. Increasing the length of alkyl chain increased compatibility with a polyolefin matrix (PE). While no processing advantage was observed by the incorporation of HBPs, polyethylene tapes …
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Telechelic Polyetherimides with Functionalized End Groups for Enhancement of Mechanical Strength, Flame Retardancy, and Optical Properties
This thesis focuses on understanding the factors that affect the properties of polyetherimide (PEI) and improving the properties. As a high-performance thermoplastic resin, the first challenge in PEI application is its high processing temperature and viscosity. Therefore, two supramolecular …
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Synthesis and Characterization of Branched and Hyperbranched Polyetherimides and Selective Chemistry on the Nanolithographically Defined Silicon(100) Surface
"Part II of this thesis describes studies regarding spatially defined, area selective chemistry on the Si(100)-2 x 1 surface. Using the tip of a scanning tunneling microscope (STM) as a localized electron beam, hydrogen can be site selectively removed from the hydrogen-terminated Si(100)-2 x 1 …
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Using Branching and Endgroups to Control the Physical Properties of Macromolecules: Systematic Studies of Etherimide Polymers
… properties, end-group modified hyperbranched polyetherimides were prepared by a one-pot, two-step reaction sequence. General synthetic techniques were developed to prepare both mono-functional terminating segments and the corresponding modified polyetherimide hyperbranched polymers. …
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Tailoring Reactivity, Architecture and Properties of High Performance Polyimides: From Additive Manufacturing to Graft Copolymers
… of both high performance polyimides and polyetherimides using vat photopolymerization (VP). The use of small molecule precursors over previously investigated polymeric precursors displayed much lower solution viscosities yielding reduction of organic solvent loading, inducing lower …
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Synthesis and characterization of phenylethynyl endcapped polyetherimide oligomers
… used for the synthesis of high molecular weight polyetherimides. Both thermoplastic materials and thermosetting systems endcapped with either phthalic or phenylethynylphthalic anhydride, respectively, have been produced. Major emphasis has been placed on polyimides derived from 2,2’- …
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Synthesis and Characterization of Aryl Phosphine Oxide Containing Thermoplastic Polyimides and Thermosetting Polyimides with Controlled Reactivity
… behavior and network properties of thermosetting polyetherimides was investigated. Reactive phenylacetylene, acetylene and maleimide terminated poly(ether imide) oligomers were prepared and characterized. Optimal reaction conditions were established to produce fully endcapped oligomers with …
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Novel Monomer Design for Next-Generation Step-Growth Polymers
… Engineering thermoplastics, such as linear polyetherimides (PEIs), had carefully targeted molecular weights for analysis of the effect of molecular weight and regiochemistry on the thermomechanical and rheological properties of PEIs. The design of linear, high performance PEIs comprising …