PP/ROSIN Blends: Isothermal Crystallization

ABSTRACT:The mechanical, thermal, and gas permeation properties of polypropylene (PP)/oligopinene systems in the form of compression thin films 10 m thick, which were prepared by quenching (with liquid nitrogen) and slow-cooling (15°C/min) techniques, were examined. The addition of oligopinene to PP changed the stress-strain curve of the polyolefin. Both for quenching and slow-cooling films, with a higher oligomer content, no more yielding was observed, and the elongation at break abruptly decreased with greater than 10% oligomer. The elastic modulus and stress at break changed according to the thermal conditions of the film preparation. Thermal analysis revealed that the blend system had two glass-transition temperatures for both types of films. The values of permeation to CO 2 were independent of the film preparation and were practically unchangeable with the oligomer content in the blends, indicating that the overall decrease in the crystallinity was counterbalanced by the rigidity of the two amorphous phases.

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Influence of the preparation on the mechanical, thermal, and gas permeation properties of polypropylene/oligopinene thin films

Mendes

Miranda

Ferreira

et al. 2003

J of Applied Polymer Sci

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Effect of addition of oligobetapinene on morphology, thermal and gas permeation properties in blends with HDPE

Mendes

Jatobá

Ferreira

et al. 2003

J of Applied Polymer Sci

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Binary blends of high density polyethylene (HDPE) and oligobetapinene (OBP) were prepared by melt mixing. The morphology, thermal and permeability properties of compression molded and slow cooled films are reported. Applying the first-derivative procedure on differential scanning calorimetry (DSC) traces, we have detected the temperature of glass transition (T g ) of HDPE as a large peak centered from Ϫ125 to Ϫ100°C. In the blends, we observed that the OBP molecules were able to resolve the transition into two components. The lower one was ascribed to the ␥-transition of HDPE, and the upper one was attributed to its T g . The OBP molecules also formed another transition at a higher temperature. The blends were composed at least of three distinct phases, likely composed of amorphous HDPE with some amount of OBP molecules, amorphous OBP with some polyolefin and crystalline HDPE. The scanning electron microscopy (SEM) investigations revealed segregation of the components. The permeation to CO 2 of plain HDPE and 90/10 blends was similar, but at higher concentrations of oligomer, the value was slightly higher than that of neat HDPE. The decrease of overall crystallinity was counterbalanced by the presence of an OBP rich phase in the blend and could explain the slight increase in permeability of the film blends.

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Modification of Polypropylene by Blending with Oligopinene

Mendes

Martins

2002

Polymers and Polymer Composites

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The changes in physical properties, melting behaviour and morphology of polypropylene (PP) in binary blends with low molar mass oligopinene resin were evaluated. Melting mixtures were prepared in a Haake Rheocord at 473 K, 30 rpm, for 600s; an abrupt drop in torque was observed when the blends were enriched by oligomer. At room temperature, with up to 20% of oligopinene, the nominal stress-strain curves of the blends showed a change in behaviour from ductile to brittle. The elastic modulus increased, and the other mechanical parameters were also dependent on the composition. The density increased linearly with oligopinene content, and the hardness also increased with the amount of oligomer present. No phase segregation was observed, before or after etching with heptane. The SEM results indicated that the oligopinene component is located mainly in the intraspherulitic regions of the PP.

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PP/ROSIN Blends: Isothermal Crystallization

Cited by 3 publications

References 6 publications

Influence of the preparation on the mechanical, thermal, and gas permeation properties of polypropylene/oligopinene thin films

Influence of the preparation on the mechanical, thermal, and gas permeation properties of polypropylene/oligopinene thin films

Effect of addition of oligobetapinene on morphology, thermal and gas permeation properties in blends with HDPE

Modification of Polypropylene by Blending with Oligopinene

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