Effect of component interaction on the melting and crystallization characteristics of pe/pib blends

Abstract

Linear low density polyethylene/polyisobutylene blends were prepared in the entire composition range. Non‐isothermal and isothermal crystallization of the samples was carried out and melting behavior was studied as a function of composition and crystallization temperature. The equilibrium melting temperature of the neat PE and the blends was determined by the Hoffman‐Weeks extrapolation technique. Flory‐Huggins interaction parameters were calculated by the approach of Nishi and Wang. The decrease of melting temperature with increasing PIB content indicated the interaction of the polymers in the melt. Both irregular chain structure of the crystalline polymer and interaction lead to a decrease of the equilibrium melting temperature and maximum lamellar thickness. The results prove that even relatively weak dispersive forces can lead to the miscibility of two polymers.

Characterization and properties of LDPE/(ground tire rubber)/crosslinked butyl rubber blends

“…A decrease in the elastic modulus value with an increasing share of elastic deformations was due to a smaller amount of the stiffer semicrystalline polyethylene present in the compositions containing higher levels of elastomer. The obtained results suggests that crosslinked butyl rubber can migrate to plastomer matrix (LDPE), which decreases the polyethylene's degree of crystallinity; similar trends for LDPE‐polyisobutylene blends are described in other publications .…”

Polymer/lignin blends: Interactions, properties, applications

“…There are several experimental methods to determine the χ value of two polymers, e.g. from the composition dependence of the Tg [145,146] or the melting temperature [147,148], from solvent uptake measurements [149,150], or from Hildebrand solubility parameters…”

Preparation and characterization of blends of high density polyethylene and poly(ethylene‐co‐1‐octene) elastomer

“…An increase was observed on the strength at break and elongation at break for blends with elastomer volume fraction in the range of 30 to 50%, indicating the existence of a good interfacial adhesion between HDPE and PEO. The synergistic effect on the strength at break was not observed for other HDPE/elastomer blends 13–23. However, a similar behavior in the strength at break of PEO elastomer modified HDPE was also verified by Yousefi et al6 The Young's modulus decreased as the concentration of elastomer in the blend increased, as the result of decreasing on the crystallinity of the HDPE matrix.…”

“…According to the manufacturer, the ethylene/α‐olefin copolymers can compete against conventional elastomers in the production of polyolefin‐based blends because, being a thermoplastic elastomer, it is produced in the pellet form, which allows for faster mixing and wider handling and compounding options 13. Several researchers have studied the properties of blends of high density polyethylene (HDPE) with conventional rubbers or elastomeric materials such as natural rubber,13–16 polyisoprene,17 polyisobutylene,18, 19 and EPDM 20–23. However, the literature relative to the study of properties of blends based on HDPE and polyolefin elastomers produced by metallocene technology is still scarce 5–7, 24.…”