Crystal structure of poly(ω‐pentadecalactone)

Abstract

The crystal structure of poly(ω‐pentadecalactone) (PPDL) synthesized by enzyme‐catalyzed polymerization was determined by full‐profile refinement. A pseudo‐orthorombic monoclinic unit cell with dimensions a = 7.49(1), b = 5.034(9), and c = 20.00(4)Å (fiber axis), and α = 90.06(4)° hosts two monomeric units belonging to polymer chains with opposite orientation, according to the P21 space‐group symmetry. A close similarity to the crystal structure of poly(ϵ‐caprolactone) was evident. However, the even number of backbone atoms in the monomer unit of PPDL leads to a lower crystal symmetry. © 2003 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys 41: 1009–1013, 2003

Synthesis and characterization of poly(ω-pentadecalactone) for its industrial-scale production

“…Table 2 shows the melting point(T m ) and crystallinity(X c ) from DSC measurement and the thermal stabilities from TGA measurement. It is shown that T m of our PPDL products was about 96 °C, similar to that obtained from other researches [1][2][3][4] . X c of the products was around 55% according to the DSC characterization.…”

“…All our obtained w M was higher than that of the literature [4] . The polymerization rate was very fast.…”

“…The spectra were characterized by two strong reflections at 2θ of 21.3° and 23.8°, corresponding to spacing of 0.4167 and 0.3737 nm, respectively, and one minor peak at a small angle of 4.6°, corresponding to a distance of 1.93 nm. All these are the characteristic peaks of PPDL [4] . …”

“…Furthermore, PPDL presents good mechanical properties comparable to linear high density polyethylene(HDPE) [1][2][3] . More and more attention has been paid to PPDL researches for its promising industrial-scale production because of its possible biodegradability, good thermal stability and mechanical properties [4][5][6][7] .…”

Enzymatic Synthesis of Polyesters via Ring-Opening Polymerization

“…Poly(PDL) is a crystalline polymer that melts close to 100 • C and has a glass transition below room temperature. The physical properties of the polyester are somehow intermediate between those of PCL and polyethylene [74].…”