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Koyano, Hirotoshi; Yamamoto, Yuzo; Saito, Yasushi; Yamanobe, Takeshi; Komoto, Tadashi
Polymer (Guilford), 1998, Letnik: 39, Številka: 18Journal Article
The two crystal structures of poly(butylene-2,6-naphthalate) (PBN) have been determined by X-ray diffraction. The space group is P 1 for both forms. The unit cell parameters of the B form are a = 4.55 A ̊ , b = 6.43 A ̊ , c (fibre axis) = 15.31 A ̊ , α = 110.1, β = 121.1 and γ = 100.6. The major difference in crystal structure between the A and B forms lies in the conformation of four methylene group sequences: SG TGS for the A form and TST S T for the B form.
