Thermodynamics of the Liquid Expanded to Condensed Phase Transition of Poly(l-lactic acid) in Langmuir Monolayers

Langmuir ◽  
2006 ◽  
Vol 22 (8) ◽  
pp. 3672-3677 ◽  
Author(s):  
Suolong Ni ◽  
Woojin Lee ◽  
Bingbing Li ◽  
Alan R. Esker
Keyword(s):  
Phase Transition ◽  
Lactic Acid ◽  
Condensed Phase ◽  
Langmuir Monolayers

Synthesis and Properties of Biodegradable Liquid Crystalline Poly(ester-Urethane)s Based on Poly(L-Lactic Acid)

2013 ◽  
Vol 652-654 ◽  
pp. 459-462
Author(s):  
Ya Tong Guo ◽  
Zhu Zheng ◽  
Zhen Qi Hou ◽  
Jie Du
Keyword(s):  
Phase Transition ◽  
Thermal Stability ◽  
Lactic Acid ◽  
Physical Properties ◽  
Liquid Crystalline ◽  
Degradation Rate ◽  
Hydrolytic Degradation ◽  
Hexamethylene Diisocyanate ◽  
Solution Polymerization ◽  
Phase Transition Temperatures

A series of biodegradable segmented liquid crystalline poly(ester-urethane)s were prepared by solution polymerization of poly(L-lactic acid) (PLLA), mesogenic diol prepolymer poly(butylene terephthaloyldioxy dibenzoates) (MD), and hexamethylene diisocyanate (HDI). The MD content was varied from 0 to 40 mol% so that the effects of the mesogen content on the thermal and physical properties, and hydrolytic degradation were examined respectively. It was found that introducing mesogens units could increase the thermal stability and the elastic properties, while reduced the phase transition temperatures and the hydrolytic degradation rate.

scholarly journals Fabrication of piezoelectric poly(l-lactic acid)/BaTiO3 fibre by the melt-spinning process

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Hyun Ju Oh ◽  
Do-Kun Kim ◽  
Young Chan Choi ◽  
Seung-Ju Lim ◽  
Jae Bum Jeong ◽  
...  
Keyword(s):  
Phase Transition ◽  
Lactic Acid ◽  
Crystalline Phase ◽  
Melt Spinning ◽  
Piezoelectric Properties ◽  
Polymeric Materials ◽  
Processing Conditions ◽  
Post Processing ◽  
Scanning Calorimetry ◽  
Spinning Process

Abstract Poly(l-lactic acid) (PLLA) based piezoelectric polymers are gradually becoming the substitute for the conventional piezoelectric ceramic and polymeric materials due to their low cost and biodegradable, non-toxic, piezoelectric and non-pyroelectric nature. To improve the piezoelectric properties of melt-spun poly(l-lactic acid) (PLLA)/BaTiO3, we optimized the post-processing conditions to increase the proportion of the β crystalline phase. The α → β phase transition behaviour was determined by two-dimensional wide-angle x-ray diffraction and differential scanning calorimetry. The piezoelectric properties of PLLA/BaTiO3 fibres were characterised in their yarn and textile form through a tapping method. From these results, we confirmed that the crystalline phase transition of PLLA/BaTiO3 fibres was significantly enhanced under the optimised post-processing conditions at a draw ratio of 3 and temperature of 120 °C during the melt-spinning process. The results indicated that PLLA/BaTiO3 fibres could be a one of the material for organic-based piezoelectric sensors for application in textile-based wearable piezoelectric devices.

Remarkable Difference of Phase Transition Behaviors Between Langmuir Monolayers and Aqueous Bilayer Vesicles of Oligopeptide-Carrying Lipids

2006 ◽  
Vol 6 (6) ◽  
pp. 1718-1730 ◽  
Author(s):  
Katsuhiko Ariga ◽  
Takashi Nakanishi ◽  
Shin-Ichi Kawanami ◽  
Takatoshi Kosaka ◽  
Jun-Ichi Kikuchi
Keyword(s):  
Phase Transition ◽  
Langmuir Monolayers ◽  
Remarkable Difference

Mass-spectrometric observation of a condensed-phase transition during effusion of gallium sesquisulfide

1997 ◽  
Vol 297 (1-2) ◽  
pp. 177-185 ◽  
Author(s):  
Jimmie G. Edwards ◽  
Pannee Mukdeeprom-Burckel ◽  
Klaus Hilpert ◽  
Dieter Kath
Keyword(s):  
Phase Transition ◽  
Condensed Phase ◽  
Mass Spectrometric

ChemInform Abstract: Mass-Spectrometric Observation of a Condensed-Phase Transition During Effusion of Gallium Sesquisulfide.

ChemInform ◽  
2010 ◽  
Vol 28 (47) ◽  
pp. no-no
Author(s):  
J. G. EDWARDS ◽  
P. MUKDEEPROM-BURCKEL ◽  
K. HILPERT ◽  
D. KATH
Keyword(s):  
Phase Transition ◽  
Condensed Phase ◽  
Mass Spectrometric
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