Atomic force microscopy observation of polylactide stereocomplex edge-on crystals in thin films: Effects of molecular weight on lamellar curvature

Hironori Marubayashi; Toshihiro Nobuoka; Shinichiro Iwamoto; Akio Takemura; Tadahisa Iwata

doi:10.1021/mz400014s

Atomic force microscopy observation of polylactide stereocomplex edge-on crystals in thin films: Effects of molecular weight on lamellar curvature

Hironori Marubayashi, Toshihiro Nobuoka, Shinichiro Iwamoto, Akio Takemura, Tadahisa Iwata

Research output: Contribution to journal › Article › peer-review

33 Citations (Scopus)

Abstract

The shapes of the edge-on lamellar crystals of equiweight poly(l-lactide) (PLLA)/poly(d-lactide) (PDLA) stereocomplexes with various combinations of molecular weights were investigated by using atomic force microscopy. In the cases of the PLLA/PDLA blends with equivalent molecular weights, the straight-shaped edge-on lamellae were observed. On the other hand, the curved edge-on crystals were able to be seen for the PLLA/PDLA stereocomplexes with nonequivalent molecular weights. It was revealed that the direction of lamellar curvature in the polylactide (PLA) stereocomplexes with nonequivalent molecular weights is the same as that of PLA having lower molecular weight. In addition to the PLLA/PDLA blending ratio, the incidence of chain folding, which is strongly influenced by molecular weight, was considered to have a crucial effect on the lamellar curvature in the edge-on crystals of PLA stereocomplexes.

Original language	English
Pages (from-to)	355-360
Number of pages	6
Journal	ACS Macro Letters
Volume	2
Issue number	5
DOIs	https://doi.org/10.1021/mz400014s
Publication status	Published - 2013 May 27
Externally published	Yes

ASJC Scopus subject areas

Organic Chemistry
Polymers and Plastics
Inorganic Chemistry
Materials Chemistry

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10.1021/mz400014s

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title = "Atomic force microscopy observation of polylactide stereocomplex edge-on crystals in thin films: Effects of molecular weight on lamellar curvature",

abstract = "The shapes of the edge-on lamellar crystals of equiweight poly(l-lactide) (PLLA)/poly(d-lactide) (PDLA) stereocomplexes with various combinations of molecular weights were investigated by using atomic force microscopy. In the cases of the PLLA/PDLA blends with equivalent molecular weights, the straight-shaped edge-on lamellae were observed. On the other hand, the curved edge-on crystals were able to be seen for the PLLA/PDLA stereocomplexes with nonequivalent molecular weights. It was revealed that the direction of lamellar curvature in the polylactide (PLA) stereocomplexes with nonequivalent molecular weights is the same as that of PLA having lower molecular weight. In addition to the PLLA/PDLA blending ratio, the incidence of chain folding, which is strongly influenced by molecular weight, was considered to have a crucial effect on the lamellar curvature in the edge-on crystals of PLA stereocomplexes.",

author = "Hironori Marubayashi and Toshihiro Nobuoka and Shinichiro Iwamoto and Akio Takemura and Tadahisa Iwata",

year = "2013",

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doi = "10.1021/mz400014s",

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journal = "ACS Macro Letters",

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TY - JOUR

T1 - Atomic force microscopy observation of polylactide stereocomplex edge-on crystals in thin films

T2 - Effects of molecular weight on lamellar curvature

AU - Marubayashi, Hironori

AU - Nobuoka, Toshihiro

AU - Iwamoto, Shinichiro

AU - Takemura, Akio

AU - Iwata, Tadahisa

PY - 2013/5/27

Y1 - 2013/5/27

N2 - The shapes of the edge-on lamellar crystals of equiweight poly(l-lactide) (PLLA)/poly(d-lactide) (PDLA) stereocomplexes with various combinations of molecular weights were investigated by using atomic force microscopy. In the cases of the PLLA/PDLA blends with equivalent molecular weights, the straight-shaped edge-on lamellae were observed. On the other hand, the curved edge-on crystals were able to be seen for the PLLA/PDLA stereocomplexes with nonequivalent molecular weights. It was revealed that the direction of lamellar curvature in the polylactide (PLA) stereocomplexes with nonequivalent molecular weights is the same as that of PLA having lower molecular weight. In addition to the PLLA/PDLA blending ratio, the incidence of chain folding, which is strongly influenced by molecular weight, was considered to have a crucial effect on the lamellar curvature in the edge-on crystals of PLA stereocomplexes.

AB - The shapes of the edge-on lamellar crystals of equiweight poly(l-lactide) (PLLA)/poly(d-lactide) (PDLA) stereocomplexes with various combinations of molecular weights were investigated by using atomic force microscopy. In the cases of the PLLA/PDLA blends with equivalent molecular weights, the straight-shaped edge-on lamellae were observed. On the other hand, the curved edge-on crystals were able to be seen for the PLLA/PDLA stereocomplexes with nonequivalent molecular weights. It was revealed that the direction of lamellar curvature in the polylactide (PLA) stereocomplexes with nonequivalent molecular weights is the same as that of PLA having lower molecular weight. In addition to the PLLA/PDLA blending ratio, the incidence of chain folding, which is strongly influenced by molecular weight, was considered to have a crucial effect on the lamellar curvature in the edge-on crystals of PLA stereocomplexes.

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JF - ACS Macro Letters

IS - 5

ER -

Atomic force microscopy observation of polylactide stereocomplex edge-on crystals in thin films: Effects of molecular weight on lamellar curvature

Abstract

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