Effect of orientation on the relative dispersion of PMDA‐ODA polyimide and polypropylene

Cheol, Yuk Keun; Samuels, Robert J.

doi:10.1002/polb.1995.090330211

Cited by 12 publications

(4 citation statements)

References 6 publications

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“…According to previous X‐ray diffraction measurements and structural refinement analysis,29, 30 BPDA‐PDA polyimide chains form crystals that are based on the orthorhombic crystal unit cell with a space group of Pba2. The diffraction peaks were indexed in accordance with the previous results 31. Five distinct (00 l ) peaks, which were not detected on the reflection pattern, appeared over the angle range of 10–48° (2θ) on the transmission pattern.…”

Section: Resultssupporting

confidence: 85%

Nanoindentation studies of polyimide thin films with various internal linkages in the diamine component

Lee

Kwon

Park

et al. 2004

J Polym Sci B Polym Phys

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Polyimide thin films were synthesized from 3,3Ј,4,4Ј-biphenyltetracarboxylic acid dianhydride (BPDA) and four different diamines (p-phenylene diamine, 4,4Јoxydiphenylene diamine, 4,4Ј-biphenylene diamine, and 4,4Ј-sulfonyldiphenylene diamine). The nanoindentation behavior of the resulting polyimides, namely, poly(pphenylene biphenyltetracarboximide) (BPDA-PDA), poly(4,4Ј-biphenylene biphenyltetracarboximide) (BPDA-BZ), poly(4,4Ј-oxydiphenylene biphenyltetracarboximide) (BPDA-ODA), and poly(4,4Ј-sulfonyldiphenylene biphenyltetracarboximide) (BPDA-DDS), were investigated. Also, the morphological properties were characterized with a prism coupler and wide-angle X-ray diffraction and were correlated to the nanoindentation studies. The nanoindentation behavior and hardness varied quite significantly, depending on the changes in the chemical and morphological structures. The hardness of the polyimide thin films increased in the following order: BPDA-DDS Ͻ BPDA-ODA Ͻ BPDA-BZ Ͻ BPDA-PDA. For all the polyimide thin films, except that of BPDA-BZ, the hardness decreased with an increase in the load. The birefringence, a measure of the molecular in-plane orientation, increased in the following order: BPDA-DDS Ͻ BPDA-ODA Ͻ BPDA-PDA Ͻ BPDA-BZ. The X-ray diffraction studies revealed that the crystallinity of the polyimide thin films varied with the changes in the chemical structure. The studies showed that the indentation response with an applied load and the hardness by nanoindentation for the BPDA-based polyimides were closely related to the morphological structure. The nanoindentation and birefringence results revealed that the mechanical properties of the polyimide thin films were dependent on the crystallinity, which arose because of the chain order along the chain axis and the molecular packing order.

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Section: Resultssupporting

confidence: 85%

Nanoindentation studies of polyimide thin films with various internal linkages in the diamine component

Lee

Kwon

Park

et al. 2004

J Polym Sci B Polym Phys

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“…From the average of three readings for each sample, measured (uncorrected) retardation (Γ m ) was noted from the retardation tables supplied by the compensator manufacturer 32. To take into account the fringe jumping phenomenon that occurs in engineering polymers like PPS, corrected value of number of orders ( N d ) was calculated using the method as described by Cha and Samuels 33. To understand fringe jumping phenomena, readers may refer to the work of Faust and Marrinan 34…”

Section: Methodsmentioning

confidence: 99%

Structure and properties development in poly(phenylene sulfide) fibers, part I: Effect of material and melt spinning process variables

Gulgunje

Bhat

Spruiell

2011

J of Applied Polymer Sci

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The detailed research study of manufacturing PPS fibers using melt spinning and further enhancement of tensile properties by drawing and annealing experiments, a study lacking as of today in open scientific literature, was the focus of this research. This article discusses the effect of polymer molecular weight (MW) and melt spinning process variables on the structure and properties development in melt spun fibers manufactured from proprietary FortronV R linear PPS resins. Structure-properties relationship was studied using several characterization tools like tensile testing, differential scanning calorimetry, polarized light optical microscopy, and wide-angle x-ray scattering. Changes in dynamic mechanical behavior of asspun fibers manufactured from resins of varying MW and different melt spinning take-up speeds were also studied. The study showed that by a combination of higher MW of the polymer and spinning at higher take-up speeds, tensile properties of as-spun PPS fibers can be improved.

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“…The 2010 model typically offers a routine ±0.0005 refractive‐index resolution for polyimide thin films. The refractive index in the film plane, n xy , was measured in the transverse electric (TE) mode, and n z was measured in the transverse magnetic (TM) mode as described elsewhere 5, 31–33. All measurements were performed using a cubic zirconia prism of n TE = n TM = 2.1677 at a wavelength of 632.8 nm.…”

Section: Methodsmentioning

confidence: 99%

Analysis of dimensionally stable copolyimide with a low-level residual stress

Chung

Jang

Hwang

et al. 2001

J. Polym. Sci. B Polym. Phys.

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Effect of orientation on the relative dispersion of PMDA‐ODA polyimide and polypropylene

Cited by 12 publications

References 6 publications

Nanoindentation studies of polyimide thin films with various internal linkages in the diamine component

Nanoindentation studies of polyimide thin films with various internal linkages in the diamine component

Structure and properties development in poly(phenylene sulfide) fibers, part I: Effect of material and melt spinning process variables

Analysis of dimensionally stable copolyimide with a low-level residual stress

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