Elasticity of crystal lattices and the mechanical properties of polyimides

Гинзбург, Б. М.; Magdalev, E. T.; Volosatov, V. N.; Frenkel, S.Ya.

doi:10.1007/bf00860772

Cited by 3 publications

(2 citation statements)

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“…Noticeable is a characteristic absorption of the {CONH{ at 1315-1550 cm 01 on metasubstiminated functional groups were first synthesized prior to the subsequent polymerization. [9][10][11] In this study, copolymerization was carried out using an amino acid (p-APA) as a coupling agent. The various copolyamides were obtained by varying different amounts (wt %) of aromatic polyamide prepolymers.…”

Section: Resultsmentioning

confidence: 99%

Synthesis and properties of nylon 6 modified with various aromatic polyamides

Wang

Lin

1998

J. Appl. Polym. Sci.

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ABSTRACT:In this study, flexible nylon 6 was reinforced by the following rigid-chain aromatic polyamides: poly( m-phenylene isophthalamide) (PmIA), poly(4,4 -diphenylsulfone terephthalamide) (PSA), poly( p-diphenyloxide terephthalamide) (POA), and poly( p-diphenylmethane terephthalamide) (PMA). Various high-molecular-weight block copolyamides were synthesized by solution polymerization using p-aminophenylacetic acid (p-APA) as a coupling agent. Their thermal properties have shown that the block copolyamides exhibit higher T g and T m and better thermal stability than those of nylon 6, especially PmIA-modified nylon 6. The order of their thermal properties of aromatic modified nylon 6 copolyamides is PmIA ú PMA ú POA ú PSA. Besides, the T g and T m of multiblock copolyamides are higher than those of triblock copolyamides. From the wide-angle X-ray diffraction pattern, it is found that the triblock copolyamides have two diffraction peaks (i.e., 2u Å 20.5 and 24Њ). However, the multiblock has only one at 2u Å 20Њ, indicating a different crystal structure for multiblock copolyamides. This can be further confirmed from scanning electron microscopy. It shows that the triblock copolyamides are a dispersed phase structure, although the multiblock copolyamides exhibit a homogeneous texture rather than an aggregated one. For the mechanical properties, it is found that the multiblock copolyamides have a more significant reinforcing effect than the triblock copolyamides. Also, the order of their physical properties of aromatic modified nylon 6 copolyamides, such as tensile strength, is PmIA ú PMA ú POA ú PSA; but for the elongation, the order is PSA ú POA ú PMA ú PmIA.

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Section: Resultsmentioning

confidence: 99%

Synthesis and properties of nylon 6 modified with various aromatic polyamides

Wang

Lin

1998

J. Appl. Polym. Sci.

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“…Magdalev introduced a significant contribution to the study of the elasticity of the crystalline lattices of polymers, especially polyimides. [26][27][28] Their study of a series of polyimides with a similar chemical structure, in fact, offered a Downloaded by [Florida International University] at 07:49 26 December 2014 unique physical method of determination of the force constants of deformation of complex polyatomic groups. [28] A cycle of interesting studies have been undertaken by B. M.Ginzburg et al on lyotropic polymer liquid crystals.…”

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confidence: 99%