Synthesis and properties of PMR type poly(benzimidazopyrrolone‐imide)s

Li, Y. F.; Hu, A. J.; Wang, X. C.; Gao, S. Q.; Yang, S. Y.

doi:10.1002/app.1999.abs

Cited by 3 publications

(7 citation statements)

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“…According to Figure 10, the onset temperature of the reduction of storage modulus ( G ′) was at 250°C for the molded plate without postcuring, whereas that of the postcured molded plate was increased to 350°C (i.e., the postcured 3,5‐PPBP‐20 molded plate showed an almost constant storage modulus until the temperature reached 350°C). In particular, its tan δ value was remarkably enhanced and the peak temperature measured in its tan δ curve was at 413.5°C, defined as the glass‐transition temperature ( T g ) of the materials16; meanwhile, the T g value the of 3,5‐PPBP‐25 molded plate was at 389.13°C. The DMA results presented in Figures 8, 9, and 10 demonstrate that the monomer molar ratio based on the PPBP‐20 molded plate would be suitable for the preparation of PMR‐type matrix resins consisting of pyrrolone, benzimidazole, and pyridine structures.…”

Section: Resultsmentioning

confidence: 99%

“…For preparation of a PPBP molding plate, an adequate molten flow was required to ensure that the molten fluid would fill out the die. There are two converse processes affecting the flow behavior of the molten fluid in thermal processing15, 16: (1) melting of the molding powder with low molecular weight to yield a flowing fluid and (2) chemical crosslinking and chain extending caused by the reaction of end caps. The key factors in thermal processing were the die temperature and applied pressure, which were controlled carefully to produce a molded plate with high quality.…”

Section: Resultsmentioning

confidence: 99%

“…For the 3,5‐PPBP‐25 molded plate, its dynamic mechanical properties are inferior to those of 3,5‐PPBP‐20, which is attributed to the better melting fluid of 3,5‐PPBP‐20 resin with lower molecular weight during the processing of molded plates. The postcuring process plays an important role in improving the properties of PMR heteroaromatic polymers 14–18. Its effect on 3,5‐PPBP‐20 molded plate is shown in Figure 10.…”

Section: Resultsmentioning

confidence: 99%

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Synthesis and properties of new polymerized monomer reactants matrix resins of pyrrolone–benzimidazole copolymers containing pyridine unit

Li¹,

Liu²,

Yang³

et al. 2004

J of Applied Polymer Sci

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A series of new polymerized monomer reactants (PMR) matrix resins of poly(pyrrolone-benzimidazole)s containing a pyridine unit (PPBP) were synthesized by polycondensation of monoethyl ester of cis-5-norbornene-endo-2,3-dicarboxylic acid, 2,6-diphenyl ester pyridinedicarboxylic acid or 3,5-diphenyl ester pyridinedicarboxylic acid, and diethyl ester of 4,4Ј-oxydiphthalic acid with 3,3Ј-diaminobenzidine in a mixing solution of anhydrous ethyl alcohol and N-methylpyrrolidone under given temperature and pressure conditions. The resulting resin solutions showed good solubility in polar organic solvents and stability at room temperature. The corresponding PPBP matrix resin, molded powder, and molded plate were prepared by undergoing amidation, imidization, cyclization, and crosslinking reactions when the reaction temperature was increased from 80 to 350°C, successively; the crosslinking structure was formed by the reverse Diels-Alder reaction at 270 -290°C under 50 MPa pressure (2.5-3.5 MPa displayed by the pressure meter). The chemical reactions and properties of the resulting PPBP were studied by means of FTIR, TGA, and DMA methods, and the results indicated that the kinds of PPBP materials retain excellent thermal stability and processability; when the initial decomposition temperature was above 620°C the T g was at 413.5°C for 3,5-PPBP-20 molded plate.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Synthesis and properties of new polymerized monomer reactants matrix resins of pyrrolone–benzimidazole copolymers containing pyridine unit

Li¹,

Liu²,

Yang³

et al. 2004

J of Applied Polymer Sci

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“…To understand the thermal decomposition behavior of the resulted polymers, the thermal degradation kinetics of polyimide films PI‐A TT and PI‐B TT was studied by DTGA 39, 40. The DTGA curves (Fig.…”

Section: Resultsmentioning

confidence: 99%

Synthesis and properties of new poly(ether imides) based on pyridine‐containing aromatic dianhydride and diamine monomers

Wang

Gong

et al. 2009

J of Applied Polymer Sci

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A series of novel aromatic poly(ether imides) with inherent viscosities of 0.48-0.70 dL/g and weight-average molecular weights of 18,800-40,500 g/mol were successfully prepared from two dianhydride and two diamine monomers containing pyridine moiety via both two-step method and one-step method. Comparison of the one-step and the two-step methods for the preparation of poly(ether imides) was carried out and shown that poly (ether imides) obtained via one-step method exhibited higher molecular weights than the similar polymers prepared through two-step process. Poly(ether imide) resins obtained via both one-step and two-step methods with subsequent chemical dehydration showed good solubility not only in high boiling point solvents but also in low boiling point solvents. High-quality poly(ether imide) films could be obtained via the two-step method with subsequent thermal imidization, which exhibited excellent thermal properties with glass transition temperatures of 239-278 C, initial decomposition temperatures of 540-574 C, residual weight percent at 800 C of 64.5-69.3% under nitrogen, good thermo-oxidative stability with initial decomposition temperatures of 521-544 C, residual weight percent at 800 C of 33.6-51.1% under air atmosphere, outstanding mechanical properties with tensile strengths in the range of 104.6-109.4 MPa, tensile modulus in the range of 1.92-2.58 GPa, and elongation at break from 6.9 to 8.0%, as well as good transparency with cutoff wavelengths of 386-392 nm and low dielectric constants of 2.80-2.92 at 1 MHz.

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“…Bell prepared poly(pyrrolone imides)s (PPyIs) for potential use in aerospace by copolymerizing tetraamine/diamine and dianhydride to increase the toughness of PPys . Yang coworkers prepared thermosetting PMR type PPyIs by copolymerizing tetraamine/diamine, diester of diphthalic acid, and monoester of dicarboxylic acid . Burns and Koros prepared PPyIs by copolymerizing tetraamine/diamine and dianhydride to control the permeability and selectivity .…”

Section: Introductionmentioning

confidence: 99%

Facile synthesis of high‐performance poly(pyrrolone imide)s from an unsymmetric phosphinated triamine

Lin

Hsu

et al. 2013

J. Polym. Sci. Part A: Polym. Chem.

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High‐performance and flexible poly(pyrrolone imide)s (PPyIs) were firstly prepared by the reaction of dianhydrides with an unsymmetric phosphinated triamine, 1‐(3,4‐diaminophenyl)‐1‐(4‐aminophenyl)‐1‐(6‐oxido‐6H ‐dibenz <1,2> oxaphosphorin‐6‐yl)ethane (1), which was prepared by a facile, one‐pot procedure from the reaction DOPO, 4‐aminoacetophenone in excess o‐phenylenediamine in the presence of p‐toluenesulfonic acid. Thermal properties of the resulting PPyIs were evaluated and compared with those of phosphinated polyimides with a similar structure. All of the prepared PPyIs films are tough and creasable. They display higher Tg (374–412 °C), lower coefficient of thermal expansion (34–46 ppm/°C), and better thermal stability (Td 5 wt %: 456–477 °C, 800 °C char yield: 59–63%) than analogous phosphinated polyimides. © 2013 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2013, 51, 2709–2715

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Synthesis and properties of PMR type poly(benzimidazopyrrolone‐imide)s

Cited by 3 publications

References 0 publications

Synthesis and properties of new polymerized monomer reactants matrix resins of pyrrolone–benzimidazole copolymers containing pyridine unit

Synthesis and properties of new polymerized monomer reactants matrix resins of pyrrolone–benzimidazole copolymers containing pyridine unit

Synthesis and properties of new poly(ether imides) based on pyridine‐containing aromatic dianhydride and diamine monomers

Facile synthesis of high‐performance poly(pyrrolone imide)s from an unsymmetric phosphinated triamine

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