NDLI: Enhancing the crystallization and orientation of electrospinning poly (lactic acid) (PLLA) by combining with additives

Content Provider	Springer Nature Link
Author	El Hadi, Ahmed M. Mohan, Saeed D. Davis, Fred J. Mitchell, Geoffrey R.
Copyright Year	2014
Abstract	PLLA is a thermoplastic biopolymer and can be used in industrial applications for medical and filtration applications. The brittleness of PLLA is attributed to slow crystallization rates and its glass transition temperature (Tg) is high (60 °C); for this reason, its applications are limited. The orientation, morphology, and crystal structure of the electrospun fibers was investigated by SEM, POM, DSC, FTIR, XRD, and SAXS. Combining with additives leads to a large decrease of fiber diameter, viscosity, and changes of fiber morphology and crystal structure compared to pure PLLA. DSC showed that the Tg of PLLA decreased about 15 °C and there was no change in relaxation enthalpy by the addition of plasticizer. FT-IR indicate a strong interaction between PLLA and additives; a new band appears in the PLLA blend at 1,756 cm$^{−1}$ at room temperature as a crystalline band without any annealing. In addition, WAXD indicated that the intensities of the two peaks at (200/110) and (203) increased for the blend at room temperature without any annealing in comparison with PLLA; this means that PHB crystallizes in the amorphous region of PLLA. The POM experiments agree with the results from DSC, FTIR, and WAXS measurements, confirming that adding PHB results in an increase in the number of nuclei with much smaller spherulites and enhances the crystallization behavior of this material, thereby improving its potential for applications.
Starting Page	1
Ending Page	12
Page Count	12
File Format	PDF
ISSN	10229760
Journal	Journal of Polymer Research
Volume Number	21
Issue Number	12
e-ISSN	15728935
Language	English
Publisher	Springer Netherlands
Publisher Date	2014-11-11
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	PHB PLLA Biopolymer blends Electrospinning Nano fibers Polymer Sciences Industrial Chemistry/Chemical Engineering Characterization and Evaluation of Materials
Content Type	Text
Resource Type	Article
Subject	Organic Chemistry Materials Chemistry Polymers and Plastics

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