Nucleation parameter and size distribution of critical nuclei for nonisothermal polymer crystallization: The influence of the cooling rate and filler. Issue 6 (11th September 2014)

• Record Type: Journal Article
• Authors: Kocic, Nikola; Lederhofer, Sara; Kretschmer, Karsten; Bastian, Martin; Heidemeyer, Peter
• Is Part Of: Journal of applied polymer science. Volume 132:Issue 6(2015:Mar. 15)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2014-09-11
• Subjects: Polymers -- Periodicals; Polymerization -- Periodicals; 668.9
• DOI: 10.1002/app.41433
• Languages: English
• ISSNs: 0021-8995

Abstract

<abstract abstract-type="main"> <title>ABSTRACT</title> <p>The nucleation parameter <italic>K<sub>g</sub></italic> of filled PP, HDPE, and PA6 is determined through nonisothermal DSC measurements. A novel method is proposed for the determination of the size distribution of critical nuclei, where the most commonly found fraction <inline-formula><alternatives><inline-graphic mimetype="image" xlink:href="ark:/27927/pgh2cn4r5qm" xlink:type="simple" xmlns:xlink="http://www.w3.org/1999/xlink" /><mml:math display="inline" altimg="urn:x-wiley:00218995:media:app41433:app41433-math-0001" overflow="scroll" xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msubsup><mml:mi>l</mml:mi><mml:mrow><mml:mtext>peak</mml:mtext></mml:mrow><mml:mo>*</mml:mo></mml:msubsup></mml:mrow></mml:math></alternatives></inline-formula> was obtained as a peak value. The models are tested at different cooling rates and different filler loadings. <italic>K<sub>g</sub></italic> varies up to a certain cooling rate and afterwards remains constant. The introduction of talc in PP and HDPE facilitates nucleation and thus reduces <italic>K<sub>g</sub></italic>. An opposite trend occurs upon the addition of bentonite in PA6. The changes of <italic>K<sub>g</sub></italic> and <inline-formula><alternatives><inline-graphic mimetype="image" xlink:href="ark:/27927/pgh2cn4r5nh" xlink:type="simple" xmlns:xlink="http://www.w3.org/1999/xlink" /><mml:math display="inline" altimg="urn:x-wiley:00218995:media:app41433:app41433-math-0002" overflow="scroll" xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msubsup><mml:mi>l</mml:mi><mml:mrow><mml:mtext>peak</mml:mtext></mml:mrow><mml:mo>*</mml:mo></mml:msubsup></mml:mrow></mml:math></alternatives></inline-formula> are reflected on sample morphology, as confirmed with SAXS. The ratio between the final crystal thickness and <inline-formula><alternatives><inline-graphic mimetype="image" xlink:href="ark:/27927/pgh2cn4r5jv" xlink:type="simple" xmlns:xlink="http://www.w3.org/1999/xlink" /><mml:math display="inline" altimg="urn:x-wiley:00218995:media:app41433:app41433-math-0003" overflow="scroll" xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msubsup><mml:mi>l</mml:mi><mml:mrow><mml:mtext>peak</mml:mtext></mml:mrow><mml:mo>*</mml:mo></mml:msubsup></mml:mrow></mml:math></alternatives></inline-formula> amounts to approx. 2 and thus agrees well with the one listed in literature. The simple linear correlations of the obtained <italic>K<sub>g</sub></italic> are established with Young's modulus and yield stress. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. <bold>2015</bold>, <italic>132</italic>, 41433.</p> </abstract>