Influence of Temperature on the Conformational Guided Physical Properties of Ultrathin Films of PLLA

Pallavi Pandit; Mandira Banerjee; G. S. Mukherjee; Rakesh Parikh; U. P. Deshpanday; Ajay Gupta

doi:10.14429/dsj.64.7329

Pallavi Pandit Devi Ahilya University, Indore
Mandira Banerjee Devi Ahilya University, Indore
G. S. Mukherjee Defence Scientific Information & Documentation Centre, New Delhi
Rakesh Parikh Raja Ramanna Centre for Advanced Technology, Indore
U. P. Deshpanday UGC-DAE, Consortium for Scientific Research, Indore
Ajay Gupta Amity University, Noida

DOI: https://doi.org/10.14429/dsj.64.7329

Keywords: Ultrathin film, Biopolymer, X-ray reflectivity, PLLA

Abstract

Poly (L lactic acid) (PLLA) ultrathin films of various thicknesses were prepared by spin coating method and investigated by using vibrational spectroscopic techniques such as FTIR and Raman. The analysis has been done in two parts: first one is verification of structural mode to understand the visibility of characteristic band to confirm the PLLA structure; where interestingly, as the thickness of the film increased, the structural features were found to be more explicit. The second part of the study was to observe the features of the film having been annealed for 1 h in two separate temperatures, one at specific annealing temperature 120 °C and the other at 160 °C to enable PLLA chains to reorient to get crystallized from its soften state at two such specific temperatures. The isothermal crystallization behavior of PLLA film at 120 °C and 160 °C from the melt was monitored by FTIR as well as Raman spectroscopies. More importantly, the band at 921 cm-1 corresponds to α crystalline phase of PLLA has been observed even in this ultrathin film with the effective application of temperature as selected in this study.

Defence Science Journal, Vol. 64, No. 3, May 2014, pp. 309-313, DOI:http://dx.doi.org/10.14429/dsj.64.7329

Author Biographies

Pallavi Pandit, Devi Ahilya University, Indore

Pallavi Pandit is a doctoral student from Devi Ahilya University, Indore, India. She has completed her MSc in 2003 from the same University and later worked as Research Intern at AMPRI, Bhopal, India during 2004 -2008. There after she joined as a CSIR Senior Research Fellow at DAVV, Indore. She is currently working in Collaborative Research Scheme of UGC-DAE Consortium for Scientific Research, India. Her expertiseis in the field of soft condensed matter, in particular, metalorganic LB films, polymer films and metal-polymer nanocomposite films. She has also been a user of SAXS beamlineat Stanford Synchrotron Radiation Light source, USA, SAXS beamline at Elettra Synchrotron, Trieste, Italy and EDXRD beamline at INDUS II, Indore, India.

Ajay Gupta, Amity University, Noida

Prof. Ajay Gupta is director of the Amity Center for Spintronic Materials, AmityUniversity, Noida. Prior to this he was Center-Director of the Indore center of UGC-DAE Consortium for Scientific Research,from where he superannuated in May 2013. He was professor of Materials Science at Devi Ahilya University, Indoretill 1994. His research interests include spintronic materials, magnetic thin films and multilayers, multiferroic materials, soft condensed matter. He has more than 300 research publications in peer-reviewed journals withabout 2500 citations.