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Nanomechanical Analysis of Nucleation Modified Isotactic Polypropylene
Author(s) -
Nowicki Marek
Publication year - 2018
Publication title -
macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 1022-1360
DOI - 10.1002/masy.201600175
Subject(s) - materials science , nanoindentation , composite material , tacticity , indentation , ultimate tensile strength , young's modulus , nucleation , tensile testing , elastic modulus , polymer , modulus , polymerization , chemistry , organic chemistry
Nanoindentation measurement is a very useful tool for studying mechanical property distributions in polymeric samples. It allows the determination of the local values of the elasticity modulus and hardness on the sample surface, thus making possible the production of maps of mechanical properties.[1][H. Murata, 1999], [2][G. Capella, 1999] Indentation depths of less than one micrometer are sufficient for precise measurement.[3][B. Bhushan, 2004], [4][A. C. Fischer‐Cripps, 2002] The distributions of hardness and elastic moduli on isotactic polypropylene (iPP) samples are presented. The samples are prepared from neat iPP and samples containing DMDBS (1,3:24‐bis(3,4‐dimethylobenzylideno) sorbitol) and PACS (pimelic acid + calcium stearate) used as nucleating agents.[5][J. Varga, 1999], [6][G. Y. Shi, 1992] The addition of DMDBS leads to creation of alpha phase iPP; on the contrary PACS gives the beta phase crystalline form in an iPP.[7][T. Sterzyński, 2004], [8][H. Bai, 2009], [9][D. Libster, 2007] Samples iPP + 0.2% PACS, iPP + 0.2% DMDBS and iPP + 0.1%PACS + 0.1% DMDBS are analyzed The nanoindentation experiments are realized on the cross section of standard specimens for a tensile test. The tested surface is polished after cutting. Indentation mapping allowed an analysis of changes in the mechanical properties as a function of distance from the mold wall for the sample produced by injection molding. The influence of nucleating agents on the homogeneity of the produced structure is discussed. In addition, the evaluated values of elastic modulus have been compared to those obtained from a static tensile test.