Thermal Expansion of Crystal Lattice of Isotactic Poly(4-methyl-1-pentene)

The thermal expansion of the crystal lattice of the isotactic poly(4-methyl-1-pentene).(P4M1P) was studied by X-ray diffraction in the temperature range between −170°C and 180°C. The range was divided into nine small regions of different expansion coefficients. Various kinds of molecular motions in some of these regions and transition points are discussed in relation to the anisotropy of the expansion and the dynamic mechanical properties of the sample. Interestingly, in two lower temperature-ranges between −126°C and −72°C, and between −45°C and −13°C the expansion coefficients abruptly increased along the a-axis whereas decreased along the c-axis. The thermal expansibility of the chain is also discussed in relation to the anisotropy of the elastic modulus of the crystal.

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