TY - JOUR
T1 - Preparation of crystallites for oriented poly(Lactic Acid) films using a casting method under a magnetic field
AU - Hara, Shuta
AU - Watanabe, Shuto
AU - Takahashi, Kohki
AU - Shimizu, Shigeru
AU - Ikake, Hiroki
N1 - Funding Information:
Figure 9. Polarization microscope images of PLLA films: (a) PLLAIL0T, (b) PLLAIL0T2, (c) PLLAIL10T, PLLAIL10T, and (d) PLLAIL10T2. The black arrow indicates the direction of the magnetic field. White bar = 50 μm. 5. Conclusions 5. Conclusions The oriented PLLA film prepared using the combining casting method and magnetic field irradTiahteio norhieansthedighPlLyLoAriefniltmedpαr-efrpoamrecdryusstainlsg. Tthheis csotumdbyindienmg ocnassttrinatge dmtehtahtogdr oawntdh mofatghniseltaicm feiellladr icrrryasdtaialtiisoonphtaims hiziegdhlwyhoernienheteadte dߙ-aftro9m0 ◦ cCryfostra2lsh. T. Ihnisasdtduidtiyo nd,etmheonefsftercatteodf tthheatiognriocwlitqhu oidf tchains liammperollvaer cXrcysbtyal misaoipnttiaminizinegd wlamheenllhaecartyedstaalt 9o0ri°eCntfaotrio2nh.toIns aodmdeitieoxnt,etnhte. eFfifnecatlloyf, tihnePioOnMic loiqbuseidrvcaatnio inmpofrotvhee ܺoୡriebnyt emdaPiLnLtaAinfiinlmg ,laitmweallsar ecvryesatlaeld otrhiaetntthaetioonri etnotesdomlaem eexlltaernct.r yFsitnaalsllyd,o inno Pt ObeMco mobesesprvhaetriuolnit eosf dthuee otoritehnetierdl oPwLLisAotfrilompy, .it was revealed that the oriented lamellar crystals do not become spherulites due to their low isotropy. Supplementary Materials: The following are available online at http://www.mdpi.com/2073-4360/10/10/1083/ Ss1u,pFpigleumreeSn1t:aRrye laMtioantebrieatlws:eeTnhhee afot tllroewatimnegn tatriem aevaanidlaXblceo fonnolinoer ieantt ewdwPLwL.mAdfiplmi.cso, mFi/g2u0r7e3S-423: 6R0e/l1a0ti/o1n0/b1e0t8w3/ese1n, Figure S1: Relation between heat treatment time and Xc of no oriented PLLA films, Figure S2: Relation between heat treatment time and Xc of PLLAIL, Figure S3: XRD patterns of PLLAIL 0T films at each heat treatment time. Supervision, H.I.; Project Administration, S.S. Author Contributions: Conceptualization, S.H.; Methodology S.H.; Investigation, S.W.; Resources, K.T.; Funding: This research received no external funding.
Publisher Copyright:
© 2018 by the authors.
PY - 2018/9/29
Y1 - 2018/9/29
N2 - Poly-L-lactic acid (PLLA) has biocompatibility and unique characteristics such as piezoelectric properties. This attracts attention not only in the environmental field but also in the biomedical and electronic materials fields. In recent years, the literature about orienting PLLA crystals has been promoting new applications for PLLA such as high strength fiberization and piezoelectric properties. This paper presents a new technique to orient the PLLA crystalline through casting under magnetic irradiation. The advantage of this technique is that it is possible to radiate the magnetic field to the PLLA crystalline in an extremely low viscosity environment. Moreover, the heat treatment condition was optimized in order to improve the low crystallinity of casting, and it succeeded in producing a PLLA film with a high degree of orientation and high crystallinity. Furthermore, PLLA/1-butyl-3-methylimidazolium dibutylphosphate (bmimjdbp) composite films were prepared under the same conditions, and this also succeeded in the further improvement of crystallinity.
AB - Poly-L-lactic acid (PLLA) has biocompatibility and unique characteristics such as piezoelectric properties. This attracts attention not only in the environmental field but also in the biomedical and electronic materials fields. In recent years, the literature about orienting PLLA crystals has been promoting new applications for PLLA such as high strength fiberization and piezoelectric properties. This paper presents a new technique to orient the PLLA crystalline through casting under magnetic irradiation. The advantage of this technique is that it is possible to radiate the magnetic field to the PLLA crystalline in an extremely low viscosity environment. Moreover, the heat treatment condition was optimized in order to improve the low crystallinity of casting, and it succeeded in producing a PLLA film with a high degree of orientation and high crystallinity. Furthermore, PLLA/1-butyl-3-methylimidazolium dibutylphosphate (bmimjdbp) composite films were prepared under the same conditions, and this also succeeded in the further improvement of crystallinity.
KW - Ionic liquid
KW - Magnetic orientation
KW - Poly-L-lactic acid
KW - α-crystal
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U2 - 10.3390/polym10101083
DO - 10.3390/polym10101083
M3 - Article
AN - SCOPUS:85054090293
VL - 10
JO - Polymers
JF - Polymers
SN - 2073-4360
IS - 10
M1 - 1083
ER -