The molecular structure of poly(biphenyl dianhydride-p-phenylenediamine) polyimide thin films by infrared spectroscopy: Thickness dependence of structure in the nano- to micrometer range

Hietpas, Geoffrey D.

doi:10.1002/(sici)1099-0488(199805)36:7<1247::aid-polb14>3.0.co;2-8

Cited by 35 publications

(74 citation statements)

References 6 publications

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“…The presence in PI films of a large absorption band between 2900 and 3100 cm -1 is associated to the C-H stretch bonds. Finally, the measurements may highlight the occurrence of a shoulder on the asymmetric C=O stretch bonds at 1710 cm -1 which corresponds to the out-of-plane optical response of the imide I conformation [37]. carboxylic acid groups can be deprotonated by the weak amine base [36].…”

Section: Fourier Transform Infrared Spectroscopy (Ftir)mentioning

confidence: 83%

BPDA-PDA Polyimide: Synthesis, Characterizations, Aging and Semiconductor Device Passivation

Diaham¹,

Locatelli²,

Khazaka³

2012

High Performance Polymers - Polyimides Based - From Chemistry to Applications

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Section: Fourier Transform Infrared Spectroscopy (Ftir)mentioning

confidence: 83%

BPDA-PDA Polyimide: Synthesis, Characterizations, Aging and Semiconductor Device Passivation

Diaham¹,

Locatelli²,

Khazaka³

2012

High Performance Polymers - Polyimides Based - From Chemistry to Applications

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“…96͔͒ and the silicon-diode temperature sensor was attached onto the upper surface of the specimen to monitor the specimen temperature. [97][98][99][100][101][102] The LF method was executed by using T-7000 ͑ULVAC-Riko͒. 77 The ruby laser power was 6 J/pulse, the laser spot radius was 10 mm, and the decay filter was inserted to minimize the temperature increase on the front surface.…”

Section: Methodsmentioning

confidence: 99%

Thermal diffusivity of aromatic polyimide thin films by temperature wave analysis

Morikawa

Hashimoto

2009

Journal of Applied Physics

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Thermal diffusivity of alkali and silver halide crystals as a function of temperature J. Appl. Phys. 109, 033516 (2011); 10.1063/1.3544444 Thermal conductivity/diffusivity of Nd 3 + doped Gd V O 4 , Y V O 4 , Lu V O 4 , and Y 3 Al 5 O 12 by temperature wave analysisThe heat transport properties of aromatic polyimide thin films have become more important in the use for the electric insulation in the microelectronic devices with highly integrated circuits. The various kinds of measuring methods have been applied to obtain the anisotropic thermal conductivity and thermal diffusivity of thin films, however, if the specimens are soft and transparent, the conventional methodology requires highly advanced technology in preparing the specimens for the measurement and the results obtained vary widely. The purpose of this study is to apply the temperature wave analysis ͑TWA͒ method to measure the thermal diffusivity of thin films and spin-coated layers of aromatic polyimide in the thickness direction at various temperatures. The TWA is an absolute method to determine the thermal diffusivity by using the phase shift of temperature wave. We have performed measurements on the five different chemical structures of aromatic polyimide, including polyimide isoindoloquinazolinedione ͑PIQ͒, pyromellitic dianhydride and 4 , 4Ј-oxydianiline ͑PMDA/ODA͒, 3,3Ј ,4,4Ј,-biphenyltetracarboxylic dianhydride and p-phenylenediamine ͑BPDA/PPDA͒, 3,3Ј ,4,4Ј-biphenyltetracarboxylic dianhydride and 4,4Ј-oxydianiline ͑BPDA/ODA͒, and 3 , 3Ј ,4,4Ј-benzophenonetetracarboxylic dianhydride and 3,3Ј-diaminobenzophenone ͑BTDA/DAB͒. As a result, thermal diffusivity of thin films in a thickness range from 0.1 to 300 m at a temperature range from 10 to 570 K is obtained. The thickness dependence of thermal diffusivity of spin-coated layers of PIQ exhibits a good coincidence with the tendency of molecular anisotropy observed by attenuated total reflection Fourier transform infrared spectroscopy. In the low temperature below 20 K the amorphous PMDA/ ODA film exhibits a substantial increase, which can be understood by considering the phonon mean free path of amorphous systems as first noted by Kittel for inorganic glasses. The glass transition of BTDA/DAB is observed as a rapid decrease of thermal diffusivity. The results indicate the availability of TWA for the present needs of accurate but simple measuring technique to determine the thermal diffusivity of thin polymer films, which is strongly dependent on the chemical and anisotropic structures.

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“…On the other hand, the degree of chain orientation is directly related to the anisotropies in optical, dielectric, and mechanical properties of polymers. The degree of PI chain orientation have been studied using various methods such as birefringence measurements (Δ n ),9–12 polarized Fourier transform infrared (FTIR) spectroscopy,13–16 and dichloic ratios in absorption spectra using doped dyes 11, 17. In particular, Δ n has been widely used as the concise estimation of chain orientation because it is easily and precisely evaluated.…”

Section: Introductionmentioning

confidence: 99%

Coefficients of molecular packing and intrinsic birefringence of aromatic polyimides estimated using refractive indices and molecular polarizabilities

Terui

Ando

2004

J Polym Sci B Polym Phys

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Molecular structure dependences of the coefficients of molecular packing (Kp) and the intrinsic birefringence (Δn0) were investigated for aromatic polyimides (PIs) using a method based on the modified Lorentz–Lorenz equation and the Vuks equation. This method needs only average refractive indices and polarizability tensors ( ) for PI repeating units. αˆ was calculated using the density functional theory at the B3LYP/6‐31+G(d) theory level that was confirmed as optimal for PI repeating units. Because bent or kinked structures in main chain hinder the ordering of polymer chains, Kp decreases in cases that ether linkages are introduced in the main chain and that kinked‐structured dianhydrides are used. Introduction of side groups, trifluoromethyl (CF3) groups in particular, also causes decreases in Kp. On the other hand, the estimated values of Δn0 are proportional to the calculated anisotropy in αˆ (Δα/Vvdw), thus Δn0 can be well predicted by computation. The values of Δα/Vvdw are decreased not only by bent structures in the main chain (e.g., ether linkage), presence of side groups, but also by large fractions of imide rings in the polymer structures. The estimated values of Δn0 range from 0.338 to 0.470, which are much larger than the reported ones for optically transparent conventional polymers. © 2004 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys 42: 2354–2366, 2004

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The molecular structure of poly(biphenyl dianhydride-p-phenylenediamine) polyimide thin films by infrared spectroscopy: Thickness dependence of structure in the nano- to micrometer range

Cited by 35 publications

References 6 publications

BPDA-PDA Polyimide: Synthesis, Characterizations, Aging and Semiconductor Device Passivation

BPDA-PDA Polyimide: Synthesis, Characterizations, Aging and Semiconductor Device Passivation

Thermal diffusivity of aromatic polyimide thin films by temperature wave analysis

Coefficients of molecular packing and intrinsic birefringence of aromatic polyimides estimated using refractive indices and molecular polarizabilities

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