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  • 1990-1994  (3)
  • Chemistry  (3)
  • Cortical dementia
  • Enlargement of ventricles
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  • 1
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Der Einfluß des Styrolgehalts auf die Eigenschaften von elektronenstrahlvernetztem, rußgefülltem Styrol-Butadien-Kautschuk (SBR) war nur bei niedrigen Strahlungsdosen, d. h. geringen Vernetzungsgraden, ausgeprägt. Bei hohen Dosen wurde kein Effekt beobachtet, insbesondere für ZnO-enthaltenden SBR. Es wurde außerdem festgestellt, daß ZnO (3 phr) die Zugfestigkeit von SBR mit einem Styrolgehalt von 23,5 Gew.-% bei 20 kGy um 20% verbesserte, verglichen mit SBR mit 46 Gew.-% Styrol. Die Zunahme der Zugfestigkeit für gefüllten SBR (23,5%) betrug bei allen Strahlungsdosen nahezu 17%. Daneben waren Reißfestigkeit, Abrasionswiderstand und Bruchdehnung erheblich verbessert. Die hohe Effizienz von ZnO bei SBR (23,5%) könnte auf dessen höheren Butadiengehalt zurückzuführen sein. Das mechanische Verhalten von SBR (46%) bei 20 kGy war überraschend, da sowohl Zugfestigkeit als auch Bruchdehnung nahezu maximal waren.
    Notes: The effect of styrene content on the properties of electron irradiation-vulcanized SBR loaded with carbon black was pronounced only at low irradiation doses where the crosslinking densities were not so high. At high doses, no effect was observed especially for SBR containing ZnO. It was also observed that ZnO (3 phr) increased the tensile strength of SBR containing 23.5 wt.-% styrene by 20% at 20 kGy irradiation dose, compared to 5% at higher doses for SBR containing 46 wt.-% styrene. However, the increase in tensile strength by ZnO for loaded SBR (23.5%) was almost 17% at all irradiation doses. Besides, tear strength, abrasion resistance and elongation at break were remarkably improved. The high efficiency of ZnO toward SBR (23.5%) may be attributed to the higher butadiene content. The behavior of SBR (46%) at 20 kGy was surprising, since both tensile strength and elongation at break were almost maximum.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Die Gamma-Bestrahlung von Polypropylen (PP) verringert dessen Molekulargewicht; die Abnahme ist in PP mit Keimbildner (NA) größer als in PP ohne NA. Bei DSC-Messungen liegt der Schmelzpunkt (Tm) von PP mit NA im ersten Durchlauf deshalb unter dem von PP ohne NA, wogegen es sich im zweiten Durchlauf genau umgekehrt verhält, da die in PP mit NA nach der Bestrahlung kürzeren Ketten nach dem ersten Durchlauf leichter kristallisieren können.
    Notes: By the addition of nucleating agent (NA), the molecular weight of gamma-irradiated polypropylene (PP) decreases more than that of PP without NA. In the first run of differential scanning calorimetric (DSC) measurement, the melting point (T m) of PP with NA was lower than the one without NA because of larger molecular scission which occurred during irradiation. On the contrary, in the second run, Tm of PP with NA, was found to be higher than that of PP without NA. Due to the presence of NA, the molecular chains become shorter during irradiation and therefore rearrangement of the chains is easier during crystallization after the first run, this contributes to an increase in Tm.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 40 (1990), S. 799-810 
    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 effect of both gamma ray and electron beam irradiations on three rubber gloves are compared in relation to sterilization. Two of these gloves are sulfur vulcanized and the other is radiation vulcanized. It was found that the radiation-vulcanized rubber gloves could be used, even at 25 kGy, the sterilization dose used. For all three gloves, it was found that the tensile strength and elongation at break are not significantly affected after irradiation in either gamma rays or electron beam or during storage. The tear strengths, however, decrease with increasing dose and storage, and it was found that degradation was higher in gamma rays than electron beam. The chemiluminescence data show that the rate of degradation is the highest in latex film followed by radiation-vulcanized and sulfur-vulcanized gloves.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
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