Diffusion and induced crystallization in polycarbonate

Ware, Robert A.; Tirtowidjojo, Steven; Cohen, Claude

doi:10.1002/app.1981.070260914

Cited by 62 publications

(36 citation statements)

References 18 publications

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“…Ware et al studied mass transport of methanol, acetone, and carbon tetrachloride in PC. The authors found that methanol sorbed via pure Case I transport and attributed this to be due to the fact that methanol is a somewhat poor solvent.…”

Section: Introductionmentioning

confidence: 99%

Acetone absorption in UV‐irradiated polycarbonate

Hsiao

Harmon

Chuang

et al. 2017

Polymer Engineering & Sci

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Isothermal acetone absorption in UV‐irradiated polycarbonate (PC) was investigated at temperatures from −23 to +25°C. The crystalline fraction of PC increased with UV dose. The anomalous transport data were analyzed based on Harmon's model which includes contributions from Case I transport characterized by the diffusion coefficient, D, and Case II transport characterized the velocity, v. Diffusion coefficients were monitored by both mass uptake using the model (D and v), and movement of the sharp front (Df). Plots of log of D, v, and equilibrium swelling ratio (ESR) versus 1/T exhibited similar features. That is, plots were linear and superimposable for all doses at the higher temperatures, and exhibited a transition temperature and then a linear region that varied with dose. The values of D, Df, and v increased with increasing dose, whereas the ESR decreased with dose. The direction of Case II transport was opposite to that of Case I diffusion during which time, sorbed solvent was expelled from the samples. Results are discussed in terms of a solvent‐induced change in lattice structure at the lower temperatures and in terms of UV radiation effects on the PC matrix that enhance solvent crystallization. POLYM. ENG. SCI., 58:1174–1183, 2018. © 2017 Society of Plastics Engineers

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Section: Introductionmentioning

confidence: 99%

Acetone absorption in UV‐irradiated polycarbonate

Hsiao

Harmon

Chuang

et al. 2017

Polymer Engineering & Sci

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“…Polycarbonate is a well-established polymer for display applications. Generally, polycarbonate is not crystallized by cooling it from the molten state; however, it could be crystallized by contact with certain solvents [8][9][10][11]. Polycarbonate spherulites could be produced by solvent-induced crystallization (SIC).…”

Section: Introductionmentioning

confidence: 99%

Antiglare Layer Formation on Polycarbonate Sheet Using UV-Curable Resin-induced Crystallization and Subsequent CO<sub>2</sub> Gas Foaming

Taki

Niinuma

Hariu

et al. 2017

J. Photopol. Sci. Technol.

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A low-reflectance film was used to reduce the reflection of light from the displays of electronic devices (personal computers, televisions, smartphones, etc.). In this study, an ultraviolet (UV)-curable resin was used to form a nano/microstructure by organic-solvent-induced crystallization and to fill the cracks in the polycarbonate plate. Two different processes were examined: Process 1: the surface of the polycarbonate plate was crystallized at 40, 60, 80, or 100 °C for 10 min and thoroughly rinsed with isopropyl alcohol; and Process 2: the surface of the polycarbonate plate was crystallized at 40 °C for a desired time. The excess UV-curable resin was removed by UV-induced curing and CO2 foaming during UV exposure using high-pressure CO 2 equipment. CO 2 pressures of 4.5, 5.5, and 6.5 MPa and CO 2 impregnation times of 80, 160, 240 s were investigated to optimize the microstructure. It was clarified that spherulites of polycarbonate existed on the surface by differential scanning calorimetry and scanning electron microscopy. The surface prepared with Process 2 had a relative reflectance that was about 600 and 30 times lower than those of the untreated polycarbonate plate and a commercially available low-reflectance film, respectively.

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“…Although thermal crystallization of BPAPC is a slow process, it crystallizes readily upon..exposure to vapours of organic solvents such as acetone, carbon tetrachloride, methanol, etc. (7)(8)(9), or in the presence of plasticizers ( 10, 1 I). Bonart (12) reported the crysta!…”

Section: Introductionmentioning

confidence: 99%

Conformational features of bisphenol-A polycarbonate

Sundararajan¹

1985

Can. J. Chem.

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Conformational energies have been estimated for the segments of the bisphenol polycarbonate chain, using the Lennard–Jones and Hill's empirical force field type of functions. It is found that the conformation of the carbonate group, defined by the torsion angle ζ, is restricted to the range of 45° to 65°. The rotations χ and χ′ of the methyl groups also show similar limited flexibility. However, accessible conformations of the diphenyl propane (DPP) segment, defined by torsion angles [Formula: see text] and ψ, span a wide area of the [Formula: see text] surface, with the restriction that the rotations [Formula: see text] and ψ be synchronized such that [Formula: see text] or 270°. These features explain the slow thermal crystallization behaviour of the polycarbonate chains. The variability of the conformations of the repeat unit is illustrated with a series of figures.

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Diffusion and induced crystallization in polycarbonate

Cited by 62 publications

References 18 publications

Acetone absorption in UV‐irradiated polycarbonate

Acetone absorption in UV‐irradiated polycarbonate

Antiglare Layer Formation on Polycarbonate Sheet Using UV-Curable Resin-induced Crystallization and Subsequent CO<sub>2</sub> Gas Foaming

Conformational features of bisphenol-A polycarbonate

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