Sub-10 nm domains in high-performance polyetherimides

Guo, Dong; Khan, Assad U.; Liu, Tianyu; Zhou, Zhengping; Liu, Guoliang

doi:10.1039/c8py01460d

Cited by 15 publications

(25 citation statements)

References 44 publications

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“…Developing new porous organic materials, especially those with uncompromised thermal stability, mechanical strength, and processability, challenges future research on porous organic materials. Exploiting existing high-performance engineering polymers, such as polyimide, in a porous form, represents a straightforward yet effective strategy 6,7 . The innovation of chemistry to synthesize high-performance porous polymers will be an enormous opportunity for polymer chemists.…”

Section: Emerging Opportunities and Applicationsmentioning

confidence: 99%

Porous organic materials offer vast future opportunities

Liu

2020

Nat Commun

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In light of the surging research on porous organic materials, we herein discuss the key issues of their porous structures, surface properties, and end functions. We also present an outlook on emerging opportunities, new applications, and data science-assisted materials discovery. Porous organic materials have diverse compositions and tunable pore sizes (Fig. 1), which have enabled a wide variety of applications including separation, filtration, storage, catalysis, and drug delivery. According to the International Union of Pure and Applied Chemistry definition, the pores in the porous organic materials are classified into micropores (<2 nm), mesopores (2-50 nm), and macropores (>50 nm). It is often beneficial for porous organic materials to possess hierarchical pores across multiple length scales. The size exclusion of these pores, as well as the physical and chemical interactions of molecules with pore surfaces, offer the porous organic materials tunable permeability and selectivity that are critical to their applications.

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Section: Emerging Opportunities and Applicationsmentioning

confidence: 99%

Porous organic materials offer vast future opportunities

Liu

2020

Nat Commun

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“…[1][2][3][4] Research efforts have been reported to overcome the drawbacks of aromatic PIs, including poor solubility in organic solvents, [5][6][7] intensive color, [8][9][10][11] and unsatisfied dielectric properties. [12][13][14] Moreover, crosslinkable and photoimageable PIs for microelectronics have been prepared through a suitable functionalization of PIs with reactive groups. [15][16][17] This research topic on PI-related materials and their potential applications continuously attracts researchers' attention.…”

Section: Introductionmentioning

confidence: 99%

Preparation of Meldrum's acid‐functionalized polyimides exhibiting organo‐soluble, reactive, self‐crosslinkable, and colorless features

Huang

Liu

2021

Journal of Polymer Science

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Functional polyimides (PIs) having some desired properties, for example, organo-solubility, chemical reactivity, crosslinkable feature, and high transparency in visible region, are attractive for specific applications. This work reports an effort to integrate the above-mentioned properties in one polyimide through introduction of Meldrum's acid (MA) moieties to polyimide chains with using a MA-containing diamine (MADA) as a monomer. The polyimide prepared with MADA and 4,4 0 -(hexafluoroisopropylidene) diphthalic anhydride (6FDA) (PI[MADA-6FDA]) has a number-averaged molecular weight of 56,800 g mol À1 , shows good solubility in tetrahydrofuran and aprotic high polar solvents, and exhibits post-reactivity/crosslinkability through MAmediated ketene chemistry. Crosslinked PI(MADA-6FDA) film shows a glass transition temperature of 289 C, a dielectric constant of about 2.78, and high flexibility bearing a near-180 bending. The MA-mediated ketene chemistry contributes to in situ building up covalent linkages between PI chains and silica nanoparticles (SNPs) in preparation of PI/SNPs nanocomposite films (NCF). Formation of the PI/SNPs NCFs enhances the thermal and mechanical properties, reduces the dielectric constants, and increases the transparency.The properties of the MA-functionalized PI are attractive for further studies on their applications.

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“…All the polymer molecular weights have been characterized by sizeexclusion chromatography (SEC) and/or end group analysis of 1 H NMR spectra. [36][37][38][39][40][41][42][43][44] We note that different strategies must be used in the synthesis of PEIs with different end groups. The incorporation of different end groups mostly utilizes the reactions between the inherent end groups after polycondensation (─NH 2 or ─DA) and other functional groups in small molecules or oligomers.…”

Section: Design Of Pei End Groupsmentioning

confidence: 99%

Poly(ether imide)s with tailored end groups

Cao

Zhao-yu

Guo

et al. 2021

Journal of Polymer Science

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Poly(ether imide) (PEI) from polycondensation of 2,2‐bis[4‐(3,4‐dicarboxyphenoxy) phenyl] propane dianhydride (BPADA) and m‐phenylenediamine (mPD) is a type of high‐temperature engineering thermoplastics that have high glass transition temperature and outstanding mechanical properties. Owing to its wide use in many fields including automotive, aircraft, and electronics, the research of PEI has surged in the last few decades. As science and technology continue to progress rapidly, there is a growing demand for PEIs with better properties. Although a few approaches have successfully improved the properties of PEI, it is recognized that these approaches require complex procedures and are uneconomical. Contrastingly, end‐group modification of PEI is highly effective, simple, and economical. Over the last few years, our group has extensively studied the methods for improving the properties of PEI through end‐group modification. The end‐group moieties and polymer blocks introduce multiple hydrogen bonding, electrostatics, and microphase separation to PEI. In this article, we first classify the end groups based on their characteristics. Then, we compare their effects on the properties of PEIs, including thermal, rheological, mechanical, optical, flame‐retardant, and morphological, and discuss the roots of these effects. The in‐depth comparisons and discussion generate principles to guide the synthesis of PEIs with tailored properties by modifying the end groups. This timely article will provide insights into the synthesis of other novel high‐temperature polymers and entice endeavors to develop novel end groups.

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Sub-10 nm domains in high-performance polyetherimides

Abstract: After condensation with polystyrene oligomers, ultra-low-molecular-weight polyetherimide-based triblock copolymers form disordered nanostructures with domain sizes less than 8 nm.

Cited by 15 publications

References 44 publications

Porous organic materials offer vast future opportunities

Porous organic materials offer vast future opportunities

Preparation of Meldrum's acid‐functionalized polyimides exhibiting organo‐soluble, reactive, self‐crosslinkable, and colorless features

Poly(ether imide)s with tailored end groups

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