Controlled Terahertz Birefringence in Stretched Poly(lactic acid) Films Investigated by Terahertz Time-Domain Spectroscopy and Wide-Angle X-ray Scattering

2017 ◽  
Vol 121 (28) ◽  
pp. 6951-6957 ◽  
Author(s):  
Hotsumi Iwasaki ◽  
Madoka Nakamura ◽  
Nozomu Komatsubara ◽  
Makoto Okano ◽  
Masayoshi Nakasako ◽  
...  
Keyword(s):  
Lactic Acid ◽  
Time Domain ◽  
Poly Lactic Acid ◽  
Wide Angle ◽  
Terahertz Time Domain Spectroscopy ◽  
Time Domain Spectroscopy ◽  
X Ray ◽  
X Ray Scattering ◽  
Ray Scattering

Crystallization behavior studied by synchrotron small-angle X-ray scattering of poly (lactic acid)/cellulose nanofibers composites

2017 ◽  
Vol 143 ◽  
pp. 106-115 ◽  
Author(s):  
Thanh Chi Nguyen ◽  
Chaiwat Ruksakulpiwat ◽  
Supagorn Rugmai ◽  
Siriwat Soontaranon ◽  
Yupaporn Ruksakulpiwat
Keyword(s):  
Lactic Acid ◽  
Small Angle ◽  
Crystallization Behavior ◽  
Cellulose Nanofibers ◽  
Poly Lactic Acid ◽  
X Ray ◽  
X Ray Scattering ◽  
Ray Scattering

Precursors in stereo-complex crystals of poly(L-lactic acid)/poly(D-lactic acid) blends under shear flow

2014 ◽  
Vol 47 (1) ◽  
pp. 14-21 ◽  
Author(s):  
Kota Hemmi ◽  
Go Matsuba ◽  
Hideto Tsuji ◽  
Takahiko Kawai ◽  
Toshiji Kanaya ◽  
...  
Keyword(s):  
Lactic Acid ◽  
Shear Flow ◽  
Density Fluctuations ◽  
Poly Lactic Acid ◽  
Order Structure ◽  
X Ray ◽  
X Ray Scattering ◽  
Complex Crystals ◽  
Ray Scattering

To improve the mechanical and the thermal performance of poly(lactic acid) materials, this work focuses on the formation of stereo-complex crystals by blending poly(L-lactic acid) (PLLA) with poly(D-lactic acid) (PDLA). The resulting structure was analyzed using time-resolvedin situX-ray scattering, optical microscopy, differential scanning calorimetry and viscoelastic measurements. The objective of this study is to investigate the effect of shear flow imposed prior to crystallization on higher-order structure formation and acceleration of stereo-complex crystal growth of PLLA and PDLA blends using a wide spatial scale analysis and viscoelastic measurements. Density fluctuations of 100 nm scale were observed prior to nucleation byin situsimultaneous wide- and small-angle X-ray scattering measurements. These density fluctuations grew with time and the intensity increased with increasing shear rate. Furthermore, the results revealed that the PLLA and PDLA chains were only partially interpenetrated; consequently, stereo-complex crystals could grow only in the mixed PLLA/PDLA phase. The correlation length of density fluctuation prior to nucleation was strongly dependent on the mixed phases.

A Revised O2 Reduction Model in Li-O2 Batteries as Revealed by in Situ Small Angle X-Ray Scattering

2019 ◽  
Author(s):  
Christian Prehal ◽  
Aleksej Samojlov ◽  
Manfred Nachtnebel ◽  
Manfred Kriechbaum ◽  
Heinz Amenitsch ◽  
...  
Keyword(s):  
Small Angle ◽  
Wide Angle ◽  
Reduction Mechanism ◽  
Reduction Model ◽  
X Ray ◽  
X Ray Scattering ◽  
O2 Reduction ◽  
Ray Scattering

<b>Here we use in situ small and wide angle X-ray scattering to elucidate unexpected mechanistic insights of the O2 reduction mechanism in Li-O2 batteries.<br></b>

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