Preparation and Characterization of Functionalized Polypropylene with Acrylamide and Itaconic Acid

Abstract

Functionalized polypropylene with acryl amide (AAm) and itaconic acid (IA) were prepared in the molten state in the presence of dicumyl peroxide. The effects of the concentration of both monomers on the degree of functionalization and properties of the products were investigated by FT-IR, contact angle measurement and DSC analysis. It was found that the degree of functionalization depends on the initial concentration of both monomers that used in the reaction. The influence of the AAm and IA content on the melting and crystallization temperature of PP was investigated by DSC. The contact angle of water on film surfaces of the functionalized PP (PP-g-AAm and PP-g-IA) decreased with increasing modified polymer content. From FT-IR spectra of functionalized PP a calculation was made of carbonyl index on the films surfaces. It was found that the higher intensity of the carbonyl index, the lower contact angle value and the lower crystallinity confirmed the existence of functionalized AAm and/or IA in PP. It was concluded from the different characterization methods that the polarity and percentage of functionalized PP were increased up to 3 phr for both monomers, and then it was decreased by increasing the amount of monomers and had a threshold value, due to nucleating agents of monomers in PP.

Nanotailoring of sepiolite clay with poly [styrene‐b‐(ethylene‐co‐butylene)‐b‐styrene]: structure–property correlation

“…The results demonstrate that initial degradation temperature of SEBS–gMA is 49°C higher than pristine SEBS. This is due to the malaic anhydride group present within the polymer chain, which acts as a nucleating agent . Also, the thermal stability of all nanocomposites is higher than neat SEBS or SEBS–gMA.…”

Synthesis and characterization of compatibilizers for blends of polypropylene carbonate and polybutylene succinate via free‐radical grafting of maleic anhydride

“…This indicates that the double bond grafted through free‐radical reaction and is appended to the polymer chain. The intensity of the peaks increases with the addition of more MAH . The peak found at 887 cm −1 is attributed to the CO and CH 2 stretching of grafted MAH.…”

“…These abstract hydrogen atoms from the PP chains which then act as free‐radical spots for the reaction with MAH. During this process, the facile intramolecular chain scission of the PP can occur, leading to the degradation of the polymer …”

Advantages of supercritical carbon dioxide for lipid hydrolysis by immobilized lipase with higher reaction rate and reproducible of repeated use

“…The change of contact angle evidently indicated hydrophilic modification of the polypropylene surface. The contact angles of polypropylene have been reported as 108°, 102°, 97°, and 80° . It seems to depend on the measurement technique and roughness of the surface.…”