Flexural behavior of <scp>PP/M</scp>ica composites interfacial modified by a <i>p</i>‐phenylen‐bis‐maleamic acid grafted atactic polypropylene modifier obtained from industrial wastes

2022

J. Compos. Sci.

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By considering that the α relaxation related to the glass to rubber transition (obtained by dynamic mechanical analysis) of isotactic polypropylene (iPP) can be identified with the thermal history of the material (and so, with the processing step), this work deals with the changes in this transition temperature (Tα) in polypropylene/mica composites caused by the mutual effect of the other components (mica and interfacial additive). Here, the additive used is a p-phenylen-bis-maleamic grafted atactic polypropylene (aPP-pPBMA) obtained from polymerization wastes (aPP) by the authors. This additive contains 5.0·10−4 g.mol−1 (15% w/w) grafted pPBMA. In essence, this article has two different objectives: (1) To observe and discuss the changes in Tα of the polymer matrix (iPP) caused by the combined effect of the other components (mica and aPP-pPBMA); and (2) predicting the values for Tα in terms of both aPP-pPBMA and mica content for whatever composition in the experimental space scanned. This task was undertaken by employing a Box–Wilson experimental design assuming the complex character of the interactions between the components of the iPP/aPP-pPBMA/mica system, which define the ultimate properties of the composite.

Section: Introductionmentioning

confidence: 54%

The Variance of the Polypropylene α Relaxation Temperature in iPP/a-PP-pPBMA/Mica Composites

2022

J. Compos. Sci.

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“…Thus, the existence of a critical interaction level caused jointly by both the amount and the type of the interface agent employed must emerge. Additionally, note that this critical interaction value is equally directly related to the processing history of the material [ 24 , 25 , 26 , 27 , 28 ]. The latter remains a prominent concern that is many times ignored in several seemingly fundamental studies that consider the processing and shaping steps as trivial.…”

Section: Resultsmentioning

confidence: 99%

“…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 ].…”

Section: Introductionmentioning

confidence: 99%

“…As a novelty respecting our previous studies, this paper tries to demonstrate the real interfacial effect of aPP-SFSA even in the very constrained scenario (the glass transition of iPP) for the interfacial agent mobility. Conceivably to mention here that the glass transition is an interval wherein the iPP relaxation consists of short-range diffusive motions at the chain segment level [ 15 , 16 , 19 , 22 , 23 , 24 , 25 , 26 , 27 , 28 , 29 , 30 ]. Thereinafter, to indicate that most works in the literature concern to grafted interfacial agents based on isotactic polypropylene with maleic anhydride grafts (succinic once grafted) [ 19 , 22 , 23 ].…”

Section: Introductionmentioning

confidence: 99%

“…Thereinafter, to indicate that most works in the literature concern to grafted interfacial agents based on isotactic polypropylene with maleic anhydride grafts (succinic once grafted) [ 19 , 22 , 23 ]. Accordingly, the use of an interfacial agent (of amorphous nature) is an innovative approach performed by the authors [ 10 , 11 , 12 , 13 , 15 , 16 , 23 , 25 , 26 , 27 , 28 , 29 , 30 ].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

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

2020

Polymers

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The present article adequately supports a twofold objective. On one hand, the study of the dynamic mechanical behavior of polypropylene/polyamide-6 blends modified by a novel compatibilizer was the objective. This was previously obtained by chemical modification of an atactic polypropylene polymerization waste. On the other hand, the accurate predictions of these properties in the experimental space scanned was the objective. As a novelty, this compatibilizer contains grafts rather than just maleated ones. Therefore, it consists precisely of an atactic polymer containing succinic anhydride (SA) bridges and both backbone and terminal grafted succinyl-fluorescein groups (SFSA) attached to the atactic backbone (aPP-SFSA). Therefore, it contains 6.2% of total grafting (2.5% as SA and 3.7% as SF), which is equivalent to 6.2 × 10−4 g·mol−1. This interfacial agent was uniquely designed and obtained by the authors themselves. Essentially, this article focuses on how the beneficial effect of both PA6 and aPP-SFSA varies the elastic (E’) and the viscous (E’’) behavior of the iPP/aPP-SFSA/PA6 blend at the iPP glass transition. Thus, we accurately measured the Dynamic Mechanical Analysis (DMA) parameters (E’, E’’) at this specific point considering it represents an extremely unfavorable scenario for the interfacial modifier due to mobility restrictions. Hence, this evidences the real interfacial modifications caused by aPP-SFSA to the iPP/PA6 system. Even more, and since each of the necessary components in the blend typically interacts with one another, we employed a Box–Wilson experimental design by its marked resemblance to the “agent-based models”. In this manner, we obtained complex algorithms accurately forecasting the dynamic mechanical behavior of the blends for all the composition range of the iPP/aPP-SFSA/PA6 system at the glass transition of iPP.

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

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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.