caa a22 4500 463191862 CHVBK 20180406164911.0 cr unu---uuuuu 170326e20070801xx s 000 0 eng 10.1007/s10973-006-8292-9 doi (NATIONALLICENCE)springer-10.1007/s10973-006-8292-9 How did we find the rigid amorphous phase? [Elektronische Daten] [J. Menczel, M. Jaffe] The first experimental evidence of the existence of the rigid amorphous phase was reported by Menczel and Wunderlich [1]: when trying to clarify the glass transition characteristics of the first main chain liquid crystalline polymers [poly(ethylene terephthalate-co-p-oxybenzoate) with 60 and 80 mol% ethylene terephthalate units] [2], the absence of the hysteresis peak at the lower temperature glass transition became evident when the sample of this copolymer was heated much faster than it had previously been cooled. Since this glass transition involved the ethylene terephthalate-rich segments of the copolymer, we searched for the source of the absence of the hysteresis peak in PET. There, the gradual disappearance of the hysteresis peak with increasing crystallinity was confirmed [1]. At the same time it was noted that the higher crystallinity samples showed a much smaller ΔC p than could be expected on the basis of the crystallinity calculated from the heat of fusion (provided that the crystallinity concept works). Later it was confirmed that the hysteresis peak is also missing at the glass transition of nematic glasses of polymers. When checking other semicrystalline polymers, the sum of the amorphous content calculated from the ΔC p at the glass transition, and the crystallinity calculated from the heat of fusion was far from 100% for a number of semicrystalline polymers. For most of these polymers, the sum of the amorphous content and the crystalline fraction was 0.7, meaning that ca. 30% rigid amorphous fraction was present in these samples after a cooling at 0.5 K min−1 rate. Thus, the presence of the rigid amorphous phase was confirmed in five semicrystalline polymers: PET, Nylon 6, PVF, Nylon 66 and polycaprolactone [1]. Somewhat later poly(butylene terephthalate) and bisphenol-A polycarbonate [3] were added to this list. In this paper we also report details on a special effect of the rigid amorphous phase (RAP) on the mobile amorphous phase (MAP): the hysteresis peak at the glass transition of the MAF disappears under the influence of the RAP, and this raises the question whether the glass transition of the MAF becomes time independent in semicrystalline polymers. Springer Science+Business Media LLC, 2007 crystallinity nationallicence DSC nationallicence glass transition nationallicence mobile amorphous phase nationallicence rigid amorphous phase nationallicence semicrystalline polymers nationallicence Menczel J. Alcon Laboratories, 6201 South Freeway, R8-9, 76123, Fort Worth, TX, USA aut Jaffe M. New Jersey Institute of Technology, 111 Lock Street, 07103, Newark, NJ, USA aut Journal of Thermal Analysis and Calorimetry Kluwer Academic Publishers-Plenum Publishers; http://www.springer-ny.com 89/2(2007-08-01), 357-362 1388-6150 89:2<357 2007 89 10973 https://doi.org/10.1007/s10973-006-8292-9 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10973-006-8292-9 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Menczel J. Alcon Laboratories, 6201 South Freeway, R8-9, 76123, Fort Worth, TX, USA aut NATIONALLICENCE 700 1- Jaffe M. New Jersey Institute of Technology, 111 Lock Street, 07103, Newark, NJ, USA aut NATIONALLICENCE 773 0- Journal of Thermal Analysis and Calorimetry Kluwer Academic Publishers-Plenum Publishers; http://www.springer-ny.com 89/2(2007-08-01), 357-362 1388-6150 89:2<357 2007 89 10973 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer