Viscoelastic Properties of Poly(ethylene Terephthalate)

Bhushan, Bharat; Connolly, Derry

doi:10.1080/05698198608981712

Cited by 12 publications

(2 citation statements)

References 11 publications

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“…Yao [14] summarized several different synthesis methods of tadalafil in detail. Deshpande [17] ，Bhushan [18] developed the method to obtain pure cis-tetrahydro-β-carboline with 65% yield, by directly heating the cis and trans mixture in dilute hydrochloric acid during the P-S reaction.…”

Section: Progress In the Synthesis Of Tadalafilmentioning

confidence: 99%

Development on the Synthesis of Phosphodieseterase Type 5 (PDE5) Inhibitors

Zhen

Zhang

2013

AMR

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Section: Progress In the Synthesis Of Tadalafilmentioning

confidence: 99%

Development on the Synthesis of Phosphodieseterase Type 5 (PDE5) Inhibitors

Zhen

Zhang

2013

AMR

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“…This principle is interesting as a counterpart to the so‐called time–temperature superposition principle. About the master curves for the humidity‐dependent modulus versus frequency, some articles were already published for amorphous samples, nylons, and so forth several decades ago or at an early stage of the time–temperature superposition principle being discovered 31–44. Most of them were made for the data of creep or stress relaxation.…”

Section: Introductionmentioning

confidence: 99%

Confirmation of universality of time–humidity superposition principle for various water‐absorbable polymers through dynamic viscoelastic measurements under controlled conditions of relative humidity and temperature

Zhou

Tashiro

2001

J Polym Sci B Polym Phys

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Dynamic viscoelastic measurements were made for storage (EЈ) and loss (EЉ) tensile moduli of water-absorbable polymers such as nylon-6, nylon-66, poly(vinyl alcohol), ethylene-vinyl alcohol copolymers, and regenerated cellulose under the control of stepwise scanned relative humidity at constant temperature by changes in the strain frequency over a wide range. Smooth master curves of log(EЈ) and log(EЉ) plotted against log(frequency) were successfully obtained for all samples. The evaluated shift factors changed with the relative humidity and could be interpreted well on the basis of a concept of free volume in the amorphous region. The free volume was affected sensitively, depending on the heat-treatment condition and the types of polymers used. For nylon-66 film, the dynamic viscoelastic measurements were made at different humidities and temperatures, from which one smooth master curve was obtained. This experimental result is important in realizing the similar effect of relative humidity and temperature on the expansion of free volume of the amorphous phase: the shift factor change induced by the relative humidity change of about 30% was equivalent to the shift factor change induced by the temperature change of about 30°C. That is, the time-humidity superposition principle and the time-temperature superposition principle were applicable as equivalent contributors to the mechanical property of waterabsorbable polymers.

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Viscoelastic and shrinkage behavior of ultrathin polymeric films

Weick

Bhushan

1995

J of Applied Polymer Sci

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SYNOPSISViscoelastic and shrinkage characteristics of five ultrathin polymeric films are presented. These films include poly(ethy1ene terephthalate) or PET, poly(ethy1ene naphthalate) or PEN, an aromatic polyamide (ARAMID), a polyimide (PI), and poly(benzoxazo1e) or PBO. PET film is currently the standard substrate used for magnetic tapes, and the other four films represent alternative substrates with improved material properties. Thicknesses of the films range from 14.4 pm for P E T to 4.4 pm for ARAMID. A creep apparatus is used to measure the viscoelastic and shrinkage characteristics of the films. The largest amount of creep compliance was measured for P E T followed by PI, PEN, ARAMID, and PBO. Creep velocity was highest for P E T and PI, followed by ARAMID, PEN, and PI. Shrinkage measurements a t 50°C for 100 h show that PEN shrinks more than all the other substrates. Time-temperature superposition is used to predict long-term creep behavior, and relationships between polymeric structure and viscoelastic behavior are also discussed. Based on their relative cost and creep behavior, PEN and ARAMID substrates appear to be suitable alternatives to PET. 0 1995 John Wiley & Sons, Inc.

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Viscoelastic Properties of Poly(ethylene Terephthalate)

Cited by 12 publications

References 11 publications

Development on the Synthesis of Phosphodieseterase Type 5 (PDE5) Inhibitors

Development on the Synthesis of Phosphodieseterase Type 5 (PDE5) Inhibitors

Confirmation of universality of time–humidity superposition principle for various water‐absorbable polymers through dynamic viscoelastic measurements under controlled conditions of relative humidity and temperature

Viscoelastic and shrinkage behavior of ultrathin polymeric films

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