The Study of Heterogeneous Polymer Systems by Synchrotron Infrared Microscopy

Polymer Engineering & Sci

2017

This work deals with the study of the evolution (with temperature) of the in‐phase (E′) and the out‐of‐phase (E″) moduli of polypropylene/mica composites with improved interfacial interactions by the presence of an industrial waste based interfacial modifier named as p‐phenylen‐bis‐maleamic (pPBMA) acid grafted atactic polypropylene (aPP–pPBMA). This additive contains 15% w/w grafted pPBMA (5.0·10−4 g mol−1) obtained from polymer industrial wastes in the Polymer Engineering Group (GIP) labs. The purpose of the work is twofold. One, dynamic mechanical analysis (DMA) has been used to evidence the improvement in properties due to the interfacial modifications by the addition of the novel interfacial modifier (aPP–pPBMA). And two, to obtain a mathematical model to predict the DMA moduli of the composite at α and β transition temperatures. So, a Box–Wilson experimental design considering the amount of mica particles and of interfacial agent as independent variables, and the modulus as the dependent ones at each transition was used. Thus, the final purpose of the work is obtaining forecasts for the DMA parameters as a function of the composite components and of the type of temperature dependent relaxation phenomena taking place. POLYM. ENG. SCI., 57:746–755, 2017. © 2017 Society of Plastics Engineers

Section: Resultssupporting

confidence: 55%

The effect of a p‐phenylen‐bis‐maleamic acid grafted atactic polypropylene interfacial agent on the dynamic‐mechanical properties of iPP/Mica composites measured at the polymer transitions

Polymer Engineering & Sci

2017

“…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 .…”

Section: Introductionmentioning

confidence: 99%

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

Polymer Engineering & Sci

2019

This work deals with a dynamic mechanical analysis (DMA) study on the effect of a novel interfacial agent containing maleated grafts on an industrial waste origin atactic polypropylene. This contains 3% of bridge‐, backbone‐, and terminal‐grafted succinic anhydride groups (aPP‐SA/SA). By considering a polymer blend as a special case of composite where the dispersed phase is mobile, it is assumed that both the amounts of polyamide 6 (PA6) and the interfacial agent (aPP‐SA/SA) cause changes in the glass transition temperature of the polypropylene phase in the blend. In this work, we have used DMA parameters to evidence the real interfacial modifications caused by the presence of aPP‐SA/SA in the isotactic polypropylene (iPP)/PA6 system at the iPP glass transition temperature on the basis that this is an unfavorable scenario for the action of aPP‐SA/SA. Since each component of the blend is interacting with each other, and to include the influence of the dispersed phase, it is possible to use a Box–Wilson experimental design model by resembling the so‐called “agent based models” to obtain algorithms forecasting the dynamic mechanical parameters (storage, E’, and loss moduli, E”) at the glass transition of iPP, in all the composition range of whatever iPP/PA6/aPP‐SA/SA‐modified blend. POLYM. ENG. SCI., 59:2458–2466, 2019. © 2019 Society of Plastics Engineers

“…Thus, on one hand by exploring the viability of the chemical modification of iPP by grafting p ‐phenylen‐ bis ‐maleamic acid (aPP‐ p PBMA) . And on the other, by the study of aPP‐ p PBMA as an interfacial modifier for the iPP/mica system as checked and concluded from the enhanced macroscopic mechanical properties obtained over both compression‐molded and injection‐molded composites …”

Section: Introductionmentioning

confidence: 99%

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

J of Applied Polymer Sci

Taranco

2017

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.