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  • Physics  (6)
  • optical disk  (1)
  • overwrite cycle  (1)
  • 1
    Electronic Resource
    Electronic Resource
    New Disk Structure for Million Cycle Overwritable Phase Change Optical Disk (1995)
    Springer
    Optical review 2 (1995), S. 100-102 
    Details
    ISSN: 1349-9432
    Keywords: phase change ; optical disk ; overwrite ; overwrite cycle ; thermal deformation ; environmental stability ; GeTe-Sb2Te3-Sb ; SiO2, ZnS-SiO2
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The overwrite cycle characteristics and environmental stability of a phase change optical disk with a new disk structure were demonstrated. The C/N ratio was around 55dB, the erase ratio was around 25dB and the phase jitter was under 50% throughout the one million cycle overwrite test. The accelerated aging test conditions were 90°C, 80%RH, for 600 hours and 70°C, 80%RH for 5,200 hours. The archival and shelf one million overwrite cycle characteristics of phase jitter were stable throughout the aging test. The life expectancy of the disk is anticipated to be more than 60 years in a 32°C, 80%RH environment.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s10043-995-0100-4
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  • 2
    Electronic Resource
    Electronic Resource
    Crystal structure of nylon 12 (1973)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Physics Edition 11 (1973), S. 1077-1089 
    Details
    ISSN: 0098-1273
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The crystal structure of nylon 12 prepared by polymerization of dodecalactam has been determined by x-ray diffraction. Nylon 12 fiber exhibits only the γ form as its stable crystal structure. The unit cell of nylon 12 was determined with the aid of the x-ray diffraction pattern of a doubly oriented specimen. The unit cell is monoclinic with a = 9.38 Å, b = 32.2 Å (fiber axis), c = 4.87 Å and β = 121.5° and contains four repeating monomer units. The chain is planar zigzag for the most part but is twisted at the position of amide groups, forming hydrogen bonds between neighboring parallel chains. The chain conformation is similar to that of the γ form of nylon 6 proposed by Arimoto. It was deduced from the calculations that there are two chain conformations statistically coexistent according to the direction of twisting. In each conformation, hydrogen bonds are formed between parallel chains to make pleated sheetlike structures. The sheets are nearly parallel to (200) and in the sheet the directions of the neighboring chains are antiparallel, as is the case with nylon 6.
    Additional Material: 13 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1973.180110604
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  • 3
    Electronic Resource
    Electronic Resource
    Swelling of nylon 6 film due to water sorption (1976)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Physics Edition 14 (1976), S. 1513-1526 
    Details
    ISSN: 0098-1273
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Dimensional changes in nylon 6 film on absorption and desorption of water were studied as functions of time and the amount of absorbed water. For absorption, a plot of film expansion versus the square root of time was sigmoidal in the initial region and did not coincide with the sorption curve: the latter was linear in the same region. This behavior is very similar to that reported for nylon 6 fiber by Kunzman. A theoretical analysis based on certain assumptions about the molecular state of nylon 6 gave good agreement with experimental results. By this analysis it was shown that the characteristic swelling behavior arises from instantaneous relaxation of the polymer molecules and is not connected with a time lag between water absorption and expansion of the polymer, as Kunzman proposed.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1976.180140812
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  • 4
    Electronic Resource
    Electronic Resource
    Crystallinity and thermal properties of polyamides containing cis- and trans-1,3-cyclohexane rings (1984)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Physics Edition 22 (1984), S. 1969-1977 
    Details
    ISSN: 0098-1273
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The cyclohexane ring-containing polyamide 1,3-CBMA-6 was synthesized from 1,3-cyclohexane-bismethylamine (1,3-CBMA) and adipic acid (6), and effects of cis/trans isomers of the ring on crystallinity and thermal properties were studied. Polymers with high cis and high trans contents, respectively, were made by polymerizing the 1,3-CBMA-6 salts of 98% cis and 93% trans derived from the salt of 75/25 (cis/trans) by fractional crystallization. A polymer with 97% cis content was highly crystalline, with a melting temperature of 253°C, while one with 93% trans contents was amorphous. In contrast to this, little difference was found in the glass transition temperature of 97 and 84°C. These results indicate that the isomers affect the conformation of the molecular chains, which determines the crystallinity and melting temperature, but they do not much affect the mobility of the chains as manifested by the glass transition.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1984.180221109
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  • 5
    Electronic Resource
    Electronic Resource
    Crystallization of poly(m-xylylene adipamide) induced by sorption of water (1985)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Physics Edition 23 (1985), S. 743-750 
    Details
    ISSN: 0098-1273
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Sorption of water in quenched amorphous poly(m-xylylene adipamide) has been studied at 50°C. The sorption process is nearly Fickian at low humidity. At relative humidities higher than about 58%, however, extremely abnormal behavior, such as a decrease in moisture uptake and a change in appearance from transparent to opaque, is found. From x-ray diffraction analysis, these changes can be attributed to crystallization. Thermal analysis of moistened samples confirmed that the crystallization is due to a drop in crystallization temperature caused by sorption of water. From the relation between the reduction in moisture uptake and the increase in volumetric crystallinity, it is proposed that the change in moisture uptake is caused by the exclusion of water from the crystalline phase.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1985.180230410
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  • 6
    Electronic Resource
    Electronic Resource
    Thermal properties of polyamides containing 1,3-cyclohexane rings (1979)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Physics Edition 17 (1979), S. 1517-1529 
    Details
    ISSN: 0098-1273
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The effect of the 1,3-cyclohexane rings in the chain backbone on thermal properties of polyamides, especially the glass-transition temperature, has been studied using polyamides based on 1,3-cyclohexanebis(methylamine). The increase in glass-transition temperature was far greater than that obtained with the analogous polymers containing m-benzene rings. However, the effects of 1,4-cyclohexane and p-benzene rings are nearly equal. Several possible causes for this difference are examined. It is concluded that restricted chain mobility due to steric hindrance of the cis-1,3-cyclohexane ring, the predominant isomer, is the most likely cause of the difference.
    Additional Material: 14 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1979.180170905
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  • 7
    Electronic Resource
    Electronic Resource
    Crystal structure of polyamides containing 1,3-cyclohexane rings (1980)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Physics Edition 18 (1980), S. 697-706 
    Details
    ISSN: 0098-1273
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The effect of 1,3-cyclohexane rings in the chain backbone on the crystal structure of polyamides has been studied using polyamides (denoted 1,3-CBMA-n) obtained from 1,3-cyclohexane-bis(methylamine) (1,3-CBMA) and n-carbon dicarboxylic acids. The crystallinity of the 1,3-CBMA-n polymers changes greatly with variation in the value of n. This is attributed to hydrogen-bond changes associated with the relative length of the diacid moiety to the diamine moiety in the monomeric unit of each polymer. In 1,3-CBMA-6, the cis-1,3-cyclohexane rings are readily accommodated in the molecular chains to form crystals in a manner similar to the m-benzene rings in poly(m-xylylene adipamide) (MXD-6). The crystal lattice, however, is more expanded than in MXD-6 since the 1,3-cyclohexane rings is bulkier than the m-benzene ring. The crystal structure of the 1,3-CBMA-n polymers is essentially the same as that of MXD-6.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1980.180180403
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