Abstract
Lozenge-shaped poly(4-hydroxybutyrate) single crystals, showing spiral growth, were obtained from a dilute ethanol solution. The crystals gave well-resolved electron diffraction patterns from which the reciprocal lattice parameters a∗=1.305nm−1,b∗=2.085nm−1 and γ∗=90° could be determined. Systematic absences occurred at every odd reflection along the two orthogonal axes a∗ and b∗. Therefore, the P(4HB) electron diffraction pattern is consistent with a p2gg two-dimensional symmetry. The unit cell of P(4HB) is orthorhombic with space group P212121 and lattice constants a=0.775±0.002nm,b=0.477±0.002nm and c(fiberaxis)=1.199±0.002nm, which is determined by X-ray fiber diagram of a stretched-annealed film combined with electron diffraction patterns of single crystals. There are two chains in one unit cell, which exist in antiparallel arrangement.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
