Chemical modification process of an atactic polypropylene by p‐phenylen‐bismaleamic acid in the melt

Abstract

This study was concerned with the chemical modification process of an atactic polypropylene from polymerization reactor byproducts with p-phenylen-bismaleamic acid to obtain a new grafted polymer supposed to play an important role as an interfacial agent in heterogeneous systems based on polymers. The grafting process was undertaken with the aid of the Box-Wilson experimental worksheet, with two independent variables (or controlled factors), the level of polar monomer to be grafted in the polymer and the concentration of the initiator, and with the agitation rate kept constant. Each item of the experimental design was performed at four different reaction times. This latter let us ascertain the transient nature of the process and the existence of a critical point in the concentration of both reactants conducting the system to the maximum grafting yield.

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

“…Accordingly, and previously to discuss about the modifications observed in the properties of the composites, it is well worth to mention that the absences of changes in the mean particle size and in the particle size distribution must be checked. In fact, the mean particle size of the mica used here was 79.8 ± 0.1 µm, and has proved to be constant even after processing . Therefore, platy mica providing a real reinforcement (not just filler) was chosen for this study.…”

“…) was an atactic polypropylene with p PBMA grafted groups (aPP– p PBMA) with 15% w/w (5 × 10 −4 mol/g polymer ) obtained in authors’ laboratories by chemical modification of polymerization wastes. Obtaining procedures and characterization of the grafted polymer was described elsewhere .…”

“…Most works in the literature concerns to grafted maleic anhydride onto isotactic polypropylene (iPP) . However, this article is devoted to the interfacial modifications caused by a novel interfacial agent with other functionality ( p ‐phenylen‐bis‐maleamic acid, p PBMA) synthesized in our laboratories from polymer wastes (atactic polypropylenes) . This interfacial agent (aPP– p PBMA) has already studied and proved to be highly effective as determined by mechanical properties (tensile, flexural, and impact), SEM, FT‐IR, and so on .…”

The Study of Heterogeneous Polymer Systems by Synchrotron Infrared Microscopy

“…[22] The segregation of the grafted material and its exclusion from crystalline zones of the sample [23] leads to improved functionality at the polymer -mineral interface. The improvement in the modulus of iPP -mica composites with a succinyl-flourescein grafted atactic polypropylene (aPP) agent has been shown to be a function of the grafting level in the interfacial agent.…”

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

“…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 .…”