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| Srl | Item |
| 1 |
ID:
130712
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| Publication |
2014.
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| Summary/Abstract |
Direct fluorination is one of the most important and effective method to modify the polymer surface. It isa simple and fast method that allows the simultaneous treatment of outer and inner surfaces of complex shaped polymeric materials. Poly-p-phenylene terephthalamide fibers which are a very important class of material was surface modified by direct fluorination. An extensive characterization of both the virgin and the fluorinated materials were performed by various techniques (XRD, FT-IR, Surface energy and DSC, TGA). From these data, possible effects of fluorination are discussed.
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| 2 |
ID:
130749
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| Publication |
2014.
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| Summary/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 ? crystalline phase of PLLA has been observed even in this ultrathin film with the effective application of temperature as selected in this study.
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| 3 |
ID:
130750
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Quantitative analysis of curing mechanisms of epoxy resin by mi
/ Cholake, Sagar T; Mada, Mykanth R; Raman, R.K. Singh; Bai, Yu, Zhao, Xl, Rizkalla, Sami, Bandyopadhyay, Sri
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| Publication |
2014.
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| Summary/Abstract |
This article informs the essence of major work done by a number of researchers on the analysis of two-step curing mechanism of diglycidyl ether of bisphenol A (DGEBA) epoxy resin in presence of amine curing agents using near- and mid-IR technology. Various peaks used as a marker for resin formation are discussed and their implementation is comprehensively studied. In addition to this, a wide range of information about the importance of reference peaks in both near-IR (NIR) and mid-IR (MIR) regions are congregated and their accuracy is audited. Also discrepancies observed by researchers in epoxy conversion (?) in NIR and MIR regions are reviewed to highlight the comparative advantages of both regions, one over the other.
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