Crystal Structure of H-Shaped Alkane ｛H3C（CH2）2｝2OHC（CH2）4COH｛（CH2）2CH3｝2 and Its Compatibility with High Density Polyethylene
Hiroko YAMAMOTO, Ayako HIMURO, Taisuke MATSUMOTO, Daisuke NODA, Akihiko TAKADA, Yukihiro MOTOYAMA, and Yoshiaki TAKAHASHI
Abstract:We synthesized a complex branched alkane (H-shaped) with two hydroxyl groups attached to branching points and studied its crystalline structure and also compatibility with high density polyethylene (PE). Results of DSC and X-ray diffraction on solution- crystallized and bulk-crystallized H-shaped alkanes gave same lattice constants for a triclinic type of crystal, a=1.04nm, b=1.27nm, c=1.60nm, α=95.7°, β=91.6°, and γ=109.4°. H-shaped/PE binary system showed a solid solution region 0.05 < φH < 0.40, where φH is the volume fraction of H-shaped alkane. On the other hand, in the region 0.46 < φH < 0.90, H-shaped and PE are considered to mix athermally in the liquid state and to present separately in this binary system, taking crystal structures different from each other. Key Words:H-shaped alkane, High density polyethylene, DSC, X-ray diffraction, Crystal structure, Amorphous, Compatibility.