Gas Permeation Properties of Biaxial OrientatedPoly(L-lactic acid) Films

碩士 === 元智大學 === 化學工程與材料科學學系 === 99 === The relationships among chain orientation, crystalline structure, crystallinity, free volume properties, and gas permeation properties of biaxial oriented poly(L-lactic acid) (BOPLLA) films were discussed in this study. The BOPLLA films were obtained from vario...

Full description

Bibliographic Details
Main Authors: Jing-Yuan Lin, 林 靖 淵
Other Authors: Yi-Ming Sun
Format: Others
Language:en_US
Published: 2011
Online Access:http://ndltd.ncl.edu.tw/handle/99590210115467358804
id ndltd-TW-099YZU05063024
record_format oai_dc
spelling ndltd-TW-099YZU050630242016-04-13T04:17:15Z http://ndltd.ncl.edu.tw/handle/99590210115467358804 Gas Permeation Properties of Biaxial OrientatedPoly(L-lactic acid) Films 雙向延伸聚(L-乳酸)薄膜於不同熱處理過程後的氣體滲透性能。 Jing-Yuan Lin 林 靖 淵 碩士 元智大學 化學工程與材料科學學系 99 The relationships among chain orientation, crystalline structure, crystallinity, free volume properties, and gas permeation properties of biaxial oriented poly(L-lactic acid) (BOPLLA) films were discussed in this study. The BOPLLA films were obtained from various treatments such as simultaneous and sequential biaxial stretching and then annealing with different lengths of time at 100, 130, or 160 oC, respectively. The crystal structure, lamellar behavior, and free volume properties of BOPLLA films were determined by wide angle X-ray diffraction (WAXD), small-angle X-ray scattering (SAXS), and Positron Annihilation Lifetime Spectroscopy (PALS), respectively. The oxygen gas permeability, diffusivity, and solubility were determined with a constant-volume variable-pressure permeation apparatus and the time-lag method. The results of WAXD indicated that increasing the annealing temperature and time will result in the increasing of crystallinity of BOPLLA. However, the in situ SAXS results from NSRRC revealed that the lamellar thickness of PLLA was maintained about the same as the annealing temperature increased from 100 to 130oC, and a rapid increased from 130 to 160oC possibly due to the α’- to α-form transition in the crystalline lattices. The α’- to α-form transition behavior can be also observed in the WAXD results of various films. IV In addition, the gas barrier property of the sequentially BOPLLA films is better than that of the simultaneously ones due to the orientated crystalline structure and higher crystallinity. The free volume properties obtained by PALS can generally explain the trend of oxygen diffusion coefficient of BOPLLA films prepared with various processing conditions. Yi-Ming Sun 孫一明 2011 學位論文 ; thesis 65 en_US
collection NDLTD
language en_US
format Others
sources NDLTD
description 碩士 === 元智大學 === 化學工程與材料科學學系 === 99 === The relationships among chain orientation, crystalline structure, crystallinity, free volume properties, and gas permeation properties of biaxial oriented poly(L-lactic acid) (BOPLLA) films were discussed in this study. The BOPLLA films were obtained from various treatments such as simultaneous and sequential biaxial stretching and then annealing with different lengths of time at 100, 130, or 160 oC, respectively. The crystal structure, lamellar behavior, and free volume properties of BOPLLA films were determined by wide angle X-ray diffraction (WAXD), small-angle X-ray scattering (SAXS), and Positron Annihilation Lifetime Spectroscopy (PALS), respectively. The oxygen gas permeability, diffusivity, and solubility were determined with a constant-volume variable-pressure permeation apparatus and the time-lag method. The results of WAXD indicated that increasing the annealing temperature and time will result in the increasing of crystallinity of BOPLLA. However, the in situ SAXS results from NSRRC revealed that the lamellar thickness of PLLA was maintained about the same as the annealing temperature increased from 100 to 130oC, and a rapid increased from 130 to 160oC possibly due to the α’- to α-form transition in the crystalline lattices. The α’- to α-form transition behavior can be also observed in the WAXD results of various films. IV In addition, the gas barrier property of the sequentially BOPLLA films is better than that of the simultaneously ones due to the orientated crystalline structure and higher crystallinity. The free volume properties obtained by PALS can generally explain the trend of oxygen diffusion coefficient of BOPLLA films prepared with various processing conditions.
author2 Yi-Ming Sun
author_facet Yi-Ming Sun
Jing-Yuan Lin
林 靖 淵
author Jing-Yuan Lin
林 靖 淵
spellingShingle Jing-Yuan Lin
林 靖 淵
Gas Permeation Properties of Biaxial OrientatedPoly(L-lactic acid) Films
author_sort Jing-Yuan Lin
title Gas Permeation Properties of Biaxial OrientatedPoly(L-lactic acid) Films
title_short Gas Permeation Properties of Biaxial OrientatedPoly(L-lactic acid) Films
title_full Gas Permeation Properties of Biaxial OrientatedPoly(L-lactic acid) Films
title_fullStr Gas Permeation Properties of Biaxial OrientatedPoly(L-lactic acid) Films
title_full_unstemmed Gas Permeation Properties of Biaxial OrientatedPoly(L-lactic acid) Films
title_sort gas permeation properties of biaxial orientatedpoly(l-lactic acid) films
publishDate 2011
url http://ndltd.ncl.edu.tw/handle/99590210115467358804
work_keys_str_mv AT jingyuanlin gaspermeationpropertiesofbiaxialorientatedpolyllacticacidfilms
AT línjìngyuān gaspermeationpropertiesofbiaxialorientatedpolyllacticacidfilms
AT jingyuanlin shuāngxiàngyánshēnjùlrǔsuānbáomóyúbùtóngrèchùlǐguòchénghòudeqìtǐshèntòuxìngnéng
AT línjìngyuān shuāngxiàngyánshēnjùlrǔsuānbáomóyúbùtóngrèchùlǐguòchénghòudeqìtǐshèntòuxìngnéng
_version_ 1718222443064066048