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  • 1
    Electronic Resource
    Electronic Resource
    Copolyesters (1991)
    Springer
    Polymer bulletin 27 (1991), S. 141-146 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary In an attempt to prepare the block copolyesters of poly (butylene terephthalate) (PBT) and poly(butylene adipate) (PBA), melt transesterification between PBT and PBA was chosen first. However, PBT and PBA were found to be immiscible within the reaction temperature range. This hindered their transesterifi-cation reaction. Various parameters such as catalyst, reaction temperature, reaction time, degree of vacuum and stirring speed all failed in preparing the block copolyesters of PBT and PBA. However, when some amount of 1,4-butanediol was added at the melt mixing stage, followed by a vacuum stage at high temperature, block copolyesters could be prepared. The chemical structure and thermal properties of the block copolyesters were characterized by NMR and DSC respectively. As the degree of randomness of the block copolyesters increased, the melt transition temperature of PBT segment decreased, and that of PBA segment decreased considerably. When, the degree of randomness reached as high as 0.35, the melt transition of PBA segment disappeared.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00296023
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  • 2
    Electronic Resource
    Electronic Resource
    Effect of salts on the formation of THF in preparation of PBT by TPA process (1992)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 45 (1992), S. 371-373 
    Details
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1992.070450220
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  • 3
    Electronic Resource
    Electronic Resource
    Further characterization of the structure and the thermal transitions of poly(p-oxybenzoate-co-p-phenylene isophthalate) polymers (1990)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 40 (1990), S. 1499-1510 
    Details
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: A series of poly(p-oxybenzoate-co-p-phenylene isophthalate)s were prepared by melt polycondensation of p-acotoxybenzoic acid, p-phenylene diacetate, and isophthalic acid followed by solid-state polymerization. The solid-state polymerization not only increased the molecular weight, but also annealed the copolyesters. The thermal stability, liquid crystallinity, thermal properties, and solid-state crystallinity of these copolyesters were investigated by TGA, polarized microscope, DSC, and wide-angle X-ray diffraction, respectively. It was found that copolyesters with HBA content of 50, 60, and 70 mol % showed explicit melt birefringence at 370°C and thus exhibited liquid crystalline state. The effect of annealing during solid-state polymerization on the thermal properties was discussed. The effect of copolymerization on their crystallinity was interpreted with X-ray diffraction qualitatively.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1990.070400907
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  • 4
    Electronic Resource
    Electronic Resource
    Copolyesters. III. Thermal degradation of poly(butylene terephthalate-co-adipate)s (1990)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 39 (1990), S. 225-232 
    Details
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: The copolyesters of poly(butylene terephthalate) and poly(butylene adipate) were prepared by melt polycondensation of 1,4-butanediol, terephthalic acid, and adipic acid. The thermal stability was important for their use a shot melt adhesives. The thermal degradation of these copolysters and homopolyesters was determined through TGA, change of acid number, IR, GPC, and NMR analyses. It was found that the thermal stability of the copolysters in oxygen decreased as the content of butylene adipate increased at temperature above and below Tm. Thermal degradation occured in oxygen even at temperature lower than Tm, so that degradation would also occur at room temperature in air and embrittlement was found for these copolysters for long term service.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1990.070390202
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  • 5
    Electronic Resource
    Electronic Resource
    Copolyesters. IV. Copolyesters of polycaprolactone and poly(butylene terephthalate) (1990)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 39 (1990), S. 233-240 
    Details
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: The copolyesters of poly(butylene terephthalate) and polycaprolactone were prepared by melt polycondensation. The charged form of the caprolactone unit was either caprolactone or polycaprolactonediol. The chemical structure of the copolyesters was investigated by proton NMR. It was found that the content of the caprolactone unit in copolyesters was lower than the charged value. The copolyesters prepared from both caprolactone and polycaprolactonediol were found to be random copolymers. Tm, Tg, and crystallinity of the copolyesters decreased as the content of caprolactone unit increased due to the copolymerization effect. The tensile strength, modulus, and hardness decreased as the content of caprolactone unit increased, which was consistent with the trend of crystallinity.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1990.070390203
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  • 6
    Electronic Resource
    Electronic Resource
    Effect of annealing on the thermal properties of poly(4-hydroxybenzoate-co-p-phenylene isophthalate)s (1990)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 191 (1990), S. 1301-1309 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: A series of poly(4-hydroxybenzoate-co-p-phenylene isophthalate)s (1) was prepared by melt polycondensation of 4-acetoxybenzoic acid, p-phenylene diacetate, and isophthalic acid followed by solid state polymerization. The thermal properties of the as-made samples were found to be significantly different from the second run thermal properties. The copolyesters with the same thermal history were annealed at 270°C in the DSC at various time intervals, and the thermal properties were further determined by DSC. For different compositions, annealing had different effects on the thermal properties of the copolyesters. With increasing annealing time the transition temperature and transition heat of 1 containing 50 and 60 mol-% of monomeric units (m. u.) of 4-hydroxybenzoic acid (HBA50 and HBA60) were found to increase. The second run DSC curves of HBA40, HBA30 and HBA20 (containing 40, 30 and 20 mol-% of 4-hydroxybenzoic acid m. u.) show two endotherms; transition heat and transition temperature of the lower temperature transition increase with the annealing time, but the transition heat of the higher temperature transition decreases. Finally, only one endotherm was observed for long-time annealing. The difference in thermal properties between the as-made sample and the second run could be described as annealing effect during solid state polymerization.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1990.021910609
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  • 7
    Electronic Resource
    Electronic Resource
    Copolyesters. VII. Thermal transitions of poly(butylene terephthalate-co-isophthalate-co-adipate)s (1994)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 51 (1994), S. 999-1004 
    Details
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: The copolyesters of 1,4-butanediol, terephthalic acid, isophthalic acid, and adipic acid with different compositions were prepared by melt polycondensation. The intrinisic viscosity of the copolyesters was controlled to be about 0.7-1.0 dL/g. Their second-run thermal properties were determined by DSC. The composition was found to be a major factor in the determination of the thermal transitions. The effect of the composition on the glass transition temperature and melt transition temperature was interesting. The glass transition temperature was found to be dependent mainly on the content of adipic acid. As the content of adipic acid increased, the glass transition decreased. When the content of terephthalic acid was not less than 35 mol % based on the total diacid monomers, the melting temperature was dependent mainly on the content of terephtalic acid and increased with incrase of the content of terephthalic acid. When the content of terephthalic acid was less than 35 mol %, the melt temperature of the copolyesters did not follow a simple rule. However, the effect of the composition on their melting enthalpy showed no simple trend. © 1994 John Wiley & Sons, Inc.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1994.070510604
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  • 8
    Electronic Resource
    Electronic Resource
    Block copolyetherester. Part 3: Preparation of block copolyetheresters by a terephthalic acid process in the presence of salts (1995)
    Stamford, Conn. [u.a.] : Wiley-Blackwell
    Polymer Engineering and Science 35 (1995), S. 190-194 
    Details
    ISSN: 0032-3888
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: The block copolyetheresters with hard segments of poly(butylene terephthalate) and soft segments of poly(tetramethylene ether) were prepared by a terephthalic acid (TPA) process in the presence of some salts. The preparations of a block copolyetherester under various conditions were first studied in a 1 L stainless steel reactor to find the best method. Then, the preparations of four block copolyetheresters were run in a pilot plant comprising a 200 L polyesterification reactor and a 200 L polymerization reactor under the suitable condition. The presence of some salts reduced the formation of tetrahydrofuran (THF), and also reduced the total reaction time in the pilot plant. The thermal properties and various mechanical properties of the block copolytheresters prepared by the pilot plant were investigated to evaluate the feasibility of this method.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pen.760350212
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  • 9
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    Unknown
    New Approach for the Synthesis of Nanozirconia Fortified Microcapsules (2017)
    American Chemical Society
    Details
    Publication Date: 2017-05-26
    Print ISSN: 0743-7463
    Electronic ISSN: 1520-5827
    Topics: Chemistry and Pharmacology
    Published by American Chemical Society
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  • 10
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    Physical chromaticity of colorant resist of color filter prepared by inkjet printing technology (2006)
    American Institute of Physics
    Details
    Publication Date: 2006-03-13
    Print ISSN: 0003-6951
    Electronic ISSN: 1077-3118
    Topics: Physics
    Published by American Institute of Physics
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