A DMA study of the interfacial changes on injection‐molded iPP/mica composites modified by a p‐phenylen‐bis‐maleamic acid grafted atactic polypropylene

Abstract

Present work concerns to the study of the dynamic mechanical and thermal responses of selected polypropylene (iPP)/mica composites with a modified interface from the matrix side by using a p‐phenylen‐bis‐maleamic acid grafted atactic polypropylene, coming from a byproduct of industrial polymerization reactors. Thus, the study is mainly focused on the 75/25 iPP/mica ratio since it was identified in previous works as providing the maximum inter mica particle distance to assure they should participate in the overall process of dissipation of the mechanical energy supplied to the composites. Hence, the present dynamic mechanical analysis discussion tries to correlate the damping responses of the injection‐molded composites with those previously obtained but over compression molded composites as the basis of further studies all along the compositional iPP/mica map. Therefore, the latter let us, on the one hand, to follow how the main values of the different dynamic mechanical analysis parameters vary because of the interfacial modifier presence, and on the other, to develop a robust correlation between them and the corresponding macroscopic mechanical parameters. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017, 134, 45366.

Industrial waste origin succinic anhydride‐grafted atactic polypropylene as compatibilizer of full range polypropylene/polyamide 6 blends as revealed by dynamic mechanical analysis at the polypropylene glass transition

“…Dynamic mechanical measurements were obtained by using an METTLER DMA861 in the tension mode by working at a dynamic force of 0.2 N oscillating at a fixed frequency of 1 Hz (for a better determination of some interfacial effect) , 4 μm of amplitude, and a heating rate of 2°C/min to maintain the material in the viscoelastic behavior range. The temperature varied between −60°C and 60°C.…”

“…Dynamic mechanical measurements were obtained by using an METTLER DMA861 in the tension mode by working at a dynamic force of 0.2 N oscillating at a fixed frequency of 1 Hz (for a better determination of some interfacial effect) [20,21,31,32], 4 μm of amplitude, and a heating rate of 2 C/min to maintain the material in the viscoelastic behavior range. The temperature varied between −60 C and 60 C. To notice that the rather low frequency and applied displacements used were chosen in order to avoid nonlinear responses and morphological changes caused by internal heat generation.…”

“…In addition to our previous studies in the topic, this article intends to prove the interfacial effect of aPP‐SA/SA even in the very unfavorable scenario for the interfacial agent mobility as it is the glass transition of iPP that is an interval whererein just short‐range diffusion motions at a chain segment level occur. At this point, it is also noteworthy to mention that most works in the literature concerns to grafted maleic anhydride onto iPP , so the use of an amorphous origin interfacial agent results an original approach by authors from early studies .…”

“…In resume, one subject of this article is to investigate the effect of the interfacial modifications caused by an interfacial agent synthesized in our laboratories from polymerization wastes through a chemical modification batch solution process [18,19] in a system with a mobile interphase [14] in contrast to a classical composite system with one rigid phase (as it is the fillers) [20][21][22][23][24][25]. Conversely to other studies in literature considering only the more rigid phase (the PA6 phase) as the dispersed one [3,[9][10][11], one novelty of this work lies in considering the whole composition range (0-100 in iPP) in the iPP/PA6 system [10,[12][13][14].…”

The Role of a Succinyl Fluorescein-Succinic Anhydride Grafted Atactic Polypropylene on the Dynamic Mechanical Properties of Polypropylene/Polyamide-6 Blends at the Polypropylene Glass Transition

“…To summarize, it is worth reminding that one of the purposes of this work lies in the investigation of the interfacial modifications by a compatibilizer obtained from polymerization wastes [ 20 , 21 ], and its use in a system wherein the interphase becomes mobile [ 14 , 15 , 16 ] rather than in particulate composite material wherein one of the phases is rigid (the reinforcement) [ 22 , 23 , 24 , 25 , 26 , 27 , 28 ]. It is worth mentioning that most studies in the literature always study PA6 contents lower than 50%, representing the rigid dispersed phase [ 3 , 9 , 10 , 11 ].…”