Thermal and Mechanical Properties of Halogen-Containing Aromatic Polyamides

Álvarez, Julio C.; Campa, José G. de la; Lozano, Ángel E.; Abajo, Javier de

doi:10.1002/1521-3935(20011101)202:16<3142::aid-macp3142>3.0.co;2-r

Cited by 25 publications

(15 citation statements)

References 16 publications

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“…The T g 's of polyamides derived from MPD lie between the values for PPD and DDE. 4,5,27,28 The thermal resistance, in terms of the initial decomposition temperature (T d ), was evaluated with TGA. The thermal stability under N 2 is fairly high, ranging from 390 to 415 8C for polymers derived from C6 and P8 diacid monomers (Table 2).…”

Section: Thermal Propertiesmentioning

confidence: 99%

Synthesis and characterization of new aromatic polyamides bearing crown ethers and acyclic ethylene oxide units in the pendant structure. III. Benzo‐18‐crown‐6 systems and their open‐chain counterparts

Carpintero¹,

Schwarz²,

García³

et al. 2006

J. Polym. Sci. A Polym. Chem.

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We report the synthesis and characterization of 10 novel polyamides containing the benzo-18-crown-6 subunit and its dipodal counterpart, along with their properties, and a comparison with homologous polyamides bearing benzo-12-crown-4, benzo-15-crown-5, and the corresponding dipodal systems. The anomalous polymerization of some of the diacid monomers, that leads to insoluble gels under standard Yamazaki polymerization conditions, is described. The gel formation has been attributed to the threading of cyclic oligoamides with a growing polyamide chain to yield rotaxanes, polyrotaxanes, catenanes, or polycatenanes. Polyamide macrocycles have been characterized with matrix-assisted laser desorption/ionization time-of-flight mass spectrometry. A route to avoid gel formation, consisting of a lower initial monomer concentration, is also described, along with the polymer properties of the polyamides obtained, including the chemical characterization, mechanical behavior, water sorption, morphology, diffusion data, and permeability of membranes prepared with these polymers.

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Section: Thermal Propertiesmentioning

confidence: 99%

Synthesis and characterization of new aromatic polyamides bearing crown ethers and acyclic ethylene oxide units in the pendant structure. III. Benzo‐18‐crown‐6 systems and their open‐chain counterparts

Carpintero¹,

Schwarz²,

García³

et al. 2006

J. Polym. Sci. A Polym. Chem.

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“…Obviously, because of hydrogen bonding, a significant lowering of the absorption frequency of the bands υ (NH) are observed, and the hydrogen‐bonding interactions decrease with the temperature increasing. This effect is known to be a function of the degree and strength of the hydrogen bonding . This clearly indicates that N[sbond]H···O[dbond]C interactions from neighboring molecules (Scheme ).…”

Section: Resultsmentioning

confidence: 95%

Facile synthesis of soluble aromatic poly(amide amine)s via C-N coupling reaction: Characterization, thermal, and optical properties

Chang

Yang

et al. 2013

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

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Aromatic poly(amide amine)s (APAAs), as novel high‐performance polymers, have been obtained by the condensation polymerization of N,N'‐bis(4‐bromobenzoyl)‐p‐phenylenediamine with two different primary aromatic diamines via palladium‐catalyzed aryl amination reaction. The structures of the polymers are characterized by means of FTIR, 1H NMR spectroscopy, and elemental analysis, the results show a good agreement with the proposed structures. DSC and TGA measurements exhibit that polymers possess high glass transition temperature (Tg > 240 °C) and good thermal stability with high decomposition temperatures (T5 > 400 °C). These novel polymers also display good solubility. In addition, due to its special structure, APAA‐2 is endowed with significantly strong photonic luminescence in N,N‐dimethylformamide and good electroactivity. © 2013 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2013, 51, 4845–4852

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“…Aromatic polyamides are one of the most successful classes of polymers due to their high thermal, mechanical strength, and good chemical resistance properties qualify them as high‐performance polymeric materials for advanced technologies [1–6]. These properties make them generally infusible and insoluble nature of the polymer restricting their wide‐spread applications, because of molecular order, strong interchain attractive forces, and hydrogen bonding that enhance effective molecular packing.…”

Section: Introductionmentioning

confidence: 99%

Influence of moieties on morphology, thermal, and dielectric properties in polyamide‐polyhedral oligomeric silsequioxanes nanocomposites

Gnanasekaran

Walter

Reddy

2012

Polymer Engineering & Sci

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A series of new hexafluoroisopropylidene, isopropylidene, carbonyl, and ether moieties substituted polyamides have been prepared from aromatic diamines and various moieties substituted aromatic dianhydrides. The synthesized polyamides were readily soluble in polar solvents such as N‐methyl‐2‐pyrrolidone, N,N‐dimethylacetamide, N,N‐dimethylformamide, and dimethyl sulfoxide. These polyamides exhibited good thermal stability and high char yields. The chemical and physical properties of the newly prepared polyamide‐polyhedral oligomeric silsequioxanes (PA‐POSS) were compared in terms of their chemical structures and thermal properties. The morphological properties of the polymeric nanocomposites depend both on their chemical structure of dianhydride and the aggregation of POSS were investigated by scanning electron microscopy, transmission electron microscopy, and atomic force microscopy. Polyamides with bulky POSS and ﬂuoro groups can effectively decrease dielectric constants. The dielectric constants of PA‐POSS were found to be decreased from 3.75 to 3.29 by changing the substitution. These polyamides showed good thermal stability up to 353 °C for a 10 % weight loss. The fluorinated polyamides have relatively higher thermal stability than the polyamides without halogen because of high bond energy of CF bond. The fiuorinated groups in the polymer backbone have played an important role in the improvement of dielectric performance of polymers. POLYM. ENG. SCI., 2013. © 2012 Society of Plastics Engineers

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Thermal and Mechanical Properties of Halogen-Containing Aromatic Polyamides

Cited by 25 publications

References 16 publications

Synthesis and characterization of new aromatic polyamides bearing crown ethers and acyclic ethylene oxide units in the pendant structure. III. Benzo‐18‐crown‐6 systems and their open‐chain counterparts

Synthesis and characterization of new aromatic polyamides bearing crown ethers and acyclic ethylene oxide units in the pendant structure. III. Benzo‐18‐crown‐6 systems and their open‐chain counterparts

Facile synthesis of soluble aromatic poly(amide amine)s via C-N coupling reaction: Characterization, thermal, and optical properties

Influence of moieties on morphology, thermal, and dielectric properties in polyamide‐polyhedral oligomeric silsequioxanes nanocomposites

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