Hydrogenated petroleum resin effect on the crystallization of isotactic polypropylene

Abstract

The influence of the hydrogenated petroleum resin P125 on the crystallization behavior, crystallization kinetics, and optical properties of polypropylene (PP) were investigated. The results of differential scanning calorimetry, successive self‐nucleation, and annealing fractionation demonstrated that P125 reduced the interaction between the PP molecules, decreased the crystallization, prevented PP from forming thick lamellae, and encouraged the formation of thin lamellae. The isothermal crystallization kinetics, self‐nucleation isothermal crystallization kinetics, and polarized optical microscopy observations showed that P125 slightly decreased the nucleation rate, significantly decreased the crystal growth rate, generally reduced the overall crystallization rate, and effectively deceased the crystallite sizes of PP. The optical properties studies showed that P125 effectively decreased the haze and increased the surface glossiness and yellowness index of PP. © 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2013

Self-Nucleation of Crystalline Phases Within Homopolymers, Polymer Blends, Copolymers, and Nanocomposites

“…The value of K On the other hand, the same LH analysis was performed on spherulitic growth data for neat PPDX homopolymer. The value obtained for the secondary nucleation constant for PPDX spherulitic growth was K This technique of performing SN just before isothermal DSC measurements has been applied to segmented copolymers of poly(ether ester), based on poly(ethylene glycol) and poly(ethylene terephtalate) [139], PP [63,133,141,151], PCL [142], PPDX [142], poly(ε-caprolactone)-block-poly(propyleneadipate) [143], poly(ethylene naphthalate) [144], poly(propylene suberate) [145], poly(propylene Then, the sample is cooled at 10 C/min to obtain a "standard" crystalline state (point 2). The sample is then ideally self-nucleated by heating to point 3.…”

Investigation on the dynamic crystallization and melting behavior of β‐nucleated isotactic polypropylene with different stereo‐defect distribution—the role of dual‐selective β‐nucleation agent

“…Nowadays, isotactic polypropylene (iPP) is one of the most widely used commodity polymers, which is a polymorphic material with several crystalline modifications, including the monoclinic α ‐form, the trigonal β ‐form, and the orthorhombic γ ‐form . Among the three crystalline forms, the β ‐modification is the most fascinating one, which can be formed mainly under the following conditions: (i) by directional crystallization in a temperature gradient field; (ii) by shear‐induced crystallization or ultrasonic irradiation; or (iii) by the addition of specific nucleating agents .…”

Influence of melt structure on the crystallization behavior and polymorphic composition of polypropylene random copolymer

“…Isotactic polypropylene (iPP) is one of the most widely used semicrystalline polymers, which has a fairly stimulating polymorphic behavior with three common crystal forms including the monoclinic a-form [1][2][3][4][5][6], the trigonal b-form [7][8][9][10] and the triclinic g-form [11,12]. It is well known that the b-form usually shows some superior properties such as excellent toughness and ductility [13,14].…”