Modification of physical properties of poly(L-lactic acid) by addition of methyl-β-cyclodextrin

• Toshiyuki Suzuki,
• Ayaka Ei,
• Yoshihisa Takada,
• Hiroki Uehara,
• Takeshi Yamanobe and
• Keiko Takahashi

Beilstein J. Org. Chem. 2014, 10, 2997–3006, doi:10.3762/bjoc.10.318

• Polytechnic University, 1583 Iiyama, Atsugi 243-0297, Japan; Fax +81-46-242-3000 10.3762/bjoc.10.318 Abstract Poly(L-lactic acid) (PLLA) is a biodegradable plastic and one of the most famous plastics made from biobased materials. However, its physical strength is insufficient compared to general-purpose

• PLLA and enhanced the drawability. Keywords: crystallinity; DSC; methyl-β-cyclodextrin; poly(L-lactic acid); Raman spectroscopy; Introduction Poly(L-lactic acid) (PLLA) has attracted attention because it is a biodegradable polymer derived from carbon-neutral resources. However, its melting point (Tm

Restructuring polymers via nanoconfinement and subsequent release

• Alan E. Tonelli

Beilstein J. Org. Chem. 2012, 8, 1318–1332, doi:10.3762/bjoc.8.151

• less crystalline than the fully segregated as-synthesized sample, is likely a result of the ability of two PCL blocks to occupy the same γ-CD IC channels [73], which are larger and, consequently, lead to partial segregation of the crystallizable PCL blocks. When PCL-b-PLLA [poly(L-lactic acid)] was

• solutions, to remove any free unthreaded guest polymer and/or host CD, and are then dried. In some instances, suspension of solid host CDs in polymer solutions or in polymer melts can also lead to IC formation [36][66]. In a related study [67] it was observed that when the α-CD IC containing guest poly(L

• -lactic acid) (PLLA) chains was suspended overnight in a solution containing poly(ε-caprolactone) (PCL), the resulting solid α-CD IC contained included PCL chains, while the displaced PLLA chains had moved into solution. Polymer–CD ICs are readily characterized by FTIR, NMR, DSC, and X-ray observations [6