Blends of polypropylene with poly(cis-butadiene) rubber. I. Phase structure and morphology of blends

Abstract

Pressed films of blends of polypropylene with poly( cis-butadiene) rubbers (PcBR) or grafted copolymer of ethyl acrylate (EA) onto PcBR (PcBR-g-EA) was examined by IR spectra, small angle X-ray scattering, small angle laser scattering (SALS), and scanning election microscopy (SEM). The problem of isomerization on PcBR (or PP/PcBR) is discussed by melt mixing (at a temperature of 180ЊC) using IR. X-ray scattering from the relation of phase was analyzed using Porod's law and led to the values of the interface layer of the blends. With increasing content of rubber, the interface layer thickness (s b ) had a maximum value at 60/40 (PP/PcBR-g-EA) for the blends. The invariant ( Q) was calculated and the relation of Q with s b was calculated using Debye-Buech statistical theory, and the average chord length ( l) was obtained by Porod's definition of blends. The morphology and structure of the blends were investigated by SEM. The phase separation of the blends was found by SALS.

Characterisation of the thickness of transition layer and its relation to mechanical properties of polypropylene/poly(ethylene-co-octene) blends

“…In fact, if the blend is compatible or partially compatible system, the transition layer is formed by molecular migration and passes through mutually between two-phase systems [21]. Further, this transition layer often acts to transmit the stress from one phase to the other and the efficiency of stress transfer continuity depends on the nature of the transition layer.…”

Role of Styrene‐Ethylene/Propylene Block Copolymer in Controlling Morphology Development of PP/PS Blends during Mixing

“…(18). Thus, the important thing is to determine the value of k. For this purpose, one can first determine the polarization ratio of the two components and calculate c by an experiment under the same condition where Q is known and therefore, obtain k by means of the definition of k.…”

“…In fact, when a suitable compatibilizer is added, it will locate between the two immiscible phases, anchor its molecular segments into the homopolymers, and thus form the interface/transition layer. [18] Further, this transition layer often acts to transmit the stress from one phase to the other and the efficiency of stress transfer continuity depends on the nature of the transition layer; in other words, the addition of the compatibilizer can improve the adhesion between phases, and consequently, improve the mechanical properties of blends. However, studies concerning the quantitative analysis of the transition layer are limited.…”

Phase Morphology and Miscibility of iPP/PcBR Blends

“…Compared to them, poly (cis-butadiene) rubber, nonpolar and having excellent elasticity, is easily available and cheaper. Presently, some attention has been played on toughening iPP using PcBR [6][7][8] .…”

“…Sheng et al [6] investigated and compared phase structure and morphology of PP=PcBR and PP=PcBR-g-EA blends. They found that the mean size of the dispersed phase in blends of PP with PcBR-g-EA was smaller than that in blends of PP with PcBR.…”