Interface modification and characterization in three‐component polymer blends

Abstract

The effect of interface characteristics on the properties of three-component polymer blends comprising PP/EVOH/mica and PP/EVOH/glass beads (GB) was investigated (polypropylene-PP, ethylene-vinylalcohol-EVOH). The systems selected are based on the binary PP/EVOH immiscible blend representing a semi-crystalline apolar polymer (PP) and a semi-crystalline highly polar copolymer (EVOH), where PP serves as the matrix. A series of the binary and three-component blends with varying compositions was chosen to study the effect of the molding procedure, i.e. compression versus injection molding. The structures observed by SEM analysis consisted of the filler particles engulfed by the EVOH phase, with some of the minor EVOH component dispersed within the PP matrix. The effects of silane treatment (GB/EVOH interface) and compatibilization, using a maleated-PP compatibilizer (PP/EVOH interface), were studied in relation to the generated structures and properties. The compatibilizer was added in a unique procedure by which the encapsulated GB/EVOH structures were preserved. The characterization methods used included morphology by Scanning Electron Microscopy, thermal properties and crystallization behavior by Differential Scanning Calorimetry, mechanical properties by tensile testing, and dynamic characteristics by Dynamic Mechanical Thermal Analysis. The work has shown that structure-performance relationships in the three-component blends can be varied and controlled. P prising three and more component systems (polymers and fillers). A major characteristic of immiscible (phase separated) polymer blends is the multi-phase morphology, and its formation sensitivity to the processing conditions. Polymer blends offer an effective 'Moshe Narkis dedicates this article with best wishes to Tony DiBenedetto. a good friend with whom he has had fruitful collaboration since 1969. static and dynamic mechanical properties of the resulting products. Incorporation of a filler to a binary immiscible polymer system can lead to several morphologies: the filler particles may disperse in the matrix along with the minor dispersed polymer phase, the filler may latcate at the interfaces between the matrix and the dispersed polymer phase, the filler may be encapsulated by the minor phase. Immiscible blend systems exhibiting filler encapsulation are PP/PA-6 blends filled with 476

Thermal and thermomechanical properties of hyperbranched polyurethane‐urea/cenosphere hybrids

“…The observed E ′ peaks (figure not shown) were shifted to higher temperature with increasing cenosphere percent. There are no significant difference in E ′′ at 40°C of the hybrid coatings but decreased above T g 40, 41. The values of crosslink density indicate that HPNG 3 (2%) hybrid coatings were closely packed network as compared to HPNG 1 (2%), HPNG 2 (2%).…”

Preparation and Characterization of Polyurethane/ZnO Nanoparticle Composites

“…The reason for this could be that the rigid particles react with isocyanate groups and are encapsulated by the long linear PU chains to form the ''core-shell'' structure. Such composites are similar to the ternary systems, which consist of filler particles encapsulated by EVOH [10,11] . In the case of low particle content, the ZnO particles are encapsulated entirely so that the fillers mostly show the properties of the linear PU when filled in the composites.…”

“…Whether the filler increases or decreases damping, it will normally increase the loss modulus because it increases the storage modulus and the increment more than compensates for any decrement in damping [10,11] . ZnO-reinforced PU shows a special behavior.…”

“…The damping behavior of polymers is due to (a) intramolecular friction and molecular relaxation, (b) friction between polymer chain and filler, (c) friction between filler and filler, and (d) deformation of microbulbs in cellules and the nature of polymers [1][2][3][4][5][6][7][8][9][10][11] . The capability relates to the intensity and broadness of the loss modulus (E 00 ) or loss tangent (tan d) peaks at the applying temperature.…”

Effect of Pre-Molding Process and Additive of Injection Molded Wood/PP Composites

“…Therefore, the distribution of the natural filler in polymer can be a major processing challenge (Dikobe and Luyt, 2009;Fisher et al, 2000;Lu et al, 2004). Several factors have already been found which could affect the mechanical behaviors of filler reinforced thermoplastics, including the characteristics of matrix and filler; interfacial bonding; filler content; filler size; aspect ratio or filler shape; filler concentration; and distribution.…”