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Digitale Medien

Transitional phenomena in α-polyolefin melts (1965)

Beck, D. L. ; Hiltz, A. A.

Stamford, Conn. [u.a.] : Wiley-Blackwell

Polymer Engineering and Science 5 (1965), S. 15-21

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ISSN: 0032-3888

Schlagwort(e): Chemistry ; Chemical Engineering

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie , Maschinenbau , Physik

Notizen: A first order transition was observed in the temperature range of about 210°C by dilatometric studies on both isotactic and atactic polypropylene and for isotactic poly (butene-1) and poly (pentene-1). No such transition was observed for polyethylene. It was found that the transition is not due to the measurements per se, to polymer treatment, to catalyst residues, or to polymer degradation. It is suggested that the transition could be due to the disappearance of liquid crystals.

Zusätzliches Material: 11 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/pen.760050104

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Digitale Medien

Tensile creep and recovery of compression molded polypropylene samples (1963)

Hiltz, A. A.

Stamford, Conn. [u.a.] : Wiley-Blackwell

Polymer Engineering and Science 3 (1963), S. 72-77

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ISSN: 0032-3888

Schlagwort(e): Chemistry ; Chemical Engineering

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie , Maschinenbau , Physik

Notizen: A simplified creep apparatus was used to evaluate the creep and recovery of polyethylene and polypropylene. The creep resistance of polypropylene containing as much as 9% n-heptane (boiling) soluble material is superior to that of linear polyethylene. The lower the boiling n-heptane soluble content, the better the resistance to creep. The creep resistance of polypropylene is also improved by annealing.

Zusätzliches Material: 15 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/pen.760030116

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Digitale Medien

Glass transitions in polypropylene (1963)

Beck, D. L. ; Hiltz, A. A. ; Knox, J. R.

Stamford, Conn. [u.a.] : Wiley-Blackwell

Polymer Engineering and Science 3 (1963), S. 279-285

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ISSN: 0032-3888

Schlagwort(e): Chemistry ; Chemical Engineering

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie , Maschinenbau , Physik

Notizen: Dilatometric measurements show that both isotactic and atactic polypropylenes have two distinct glass transition temperatures. Because of the two transitions, three values for the cubical coefficient of thermal expansion are necessary to accurately define the volume expansion of polypropylene from -80° to +90°C. A method is outlined for calculating the content of amorphous atactic, amorphous isotactic, and crystalline isotactic polymer in a given polypropylene sample.

Zusätzliches Material: 11 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/pen.760030407

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