Quantification of highly oriented nucleating agent in PP-R by IR-microscopy, polarised light microscopy, differential scanning calorimetry and nuclear magnetic resonance spectroscopy

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• 作者：Tobias Schuster^a ; Subin Damodaran^a ; Karsten Rode^a ; Frank Malz^a ; Robert Brü ; ll^a ; ^{robert.bruell@lbf.fraunhofer.de" class="auth_mail} ; Britta Gerets^b ; Mirko Wenzel^b ; Martin Bastian^b
• 关键词：IR microscopy (渭FTIR) ; Nucleating agent ; Orientation
• 刊名：Polymer
• 出版年：1 April, 2014
• 年：2014
• 卷：55
• 期：7
• 页码：1724-1736
• 全文大小：2698 K

文摘

To relate a morphological structure of polymeric specimens to the applied conditions of the production process requires to be able to analyse the morphology and composition of the specimen with high spatial resolution, ideally with a single technique. Infrared microscopy (渭FTIR) is a highly attractive technique to map the crystallinity and additive content of polymer samples due to its simplicity and spatial resolution. However, no methods exist yet which allow to exploit these advantages for oriented minority phases with high aspect ratio, and to study the degree of crystallinity in oriented polymer samples. Based on a theoretically derived approach we show for the first time that the spatial distribution of the 尾-nucleating agent N,N鈥?dicyclohexyl-2,6-naphthalenedicarboxamide (NU-100) in random ethylene propylene copolymer (PP-R) can be determined by 渭FTIR from the sum of the absorption intensities in three directions of inspection. Using the same approach the degree of crystallinity of the polymer can be profiled, thus eliminating the problem arising from dichroism inferred by chain orientation. The newly developed method was applied to specimen of PP-R prepared by extrusion, injection and compression moulding. The results regarding the NU-100 content are in good agreement with results from nuclear magnetic resonance (NMR) and the results regarding morphology confirm those from polarised light microscopy (PLM) and differential scanning calorimetry (DSC). This method development opens the perspective to establish process聽鈫捖爏tructure relationships for samples having an arbitrary degree of orientation with regard to the main phase as well as the minority phase.