Maurizio Fiorini

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Maurizio Fiorini

Maurizio Fiorini 
Professor, Bologna University, DICAM & CIRI MAM

Talk WEDNESDAY, SEPTEMBER 12, 2018

Inventing the Future of Performance Nonwovens for Health and Personal Care

Combined Raman Spectroscopy and Rheology to Study PLA Stereocomplex Formation Dynamics

The formation of stereocomplex between PLLA and PDLA (PLA-sc) offers an outstanding opportunity to increasing thermo-mechanical properties of polylactides, which enables them to compete with well established techno polymers such as PP, PBT and PA-6 in durable applications.

Scaling up PLA-sc production from lab-scale solvent casting techniques to a larger scale requires a deep understanding of thermal and rheological processing conditions. Thanks to a unique lab facility, which combines a dispersive Raman microscope with a modified parallel plate rheometer, simultaneous rheological and spectroscopic analysis could be carried out. We were able to investigate the effects of several parameters, namely: polylactide molecular weight, temperature, cooling rate, and shear stress on the kinetics of PLA-sc formation.

Data on rheological parameters: G’, G” and eta* (under small amplitude oscillatory shear, SAOS) were collected during on-line Raman spectra acquisition. Formation of PLA-sc and its crystallization induced a very sharp increase in eta* values, while G”/G’ ratio changed from values typical of a viscoelastic melt to those of a viscoelastic solid. Two indices of PLA-sc formation, induction time and G’/G” crossover were derived from flow curves under SAOS. At the same time, in the Raman spectra, the intensity of PLA-sc carbonyl band at 1749 cm-1 increased whereas the intensity of the homopolymer carbonyl band at 1772 cm-1 decreased. From these two band ratios, a spectroscopic index of PLA-sc formation was calculated. The evolution of the rheological and Raman indices with time were showed to be in a very good agreement.

About Maurizio Fiorini

Education: University of Bologna, Master and Ph.D. in Industrial Chemistry.

Academic position: 1989-2001: Research Assistant; 2001 -: Associate Professor, University of Bologna

Research interests: Synthesis, modification and characterization of polymeric materials; polymer blends and nanocomposites. Flame resistance of polymer from renewable resources. Bio-based packaging.

Experience in collaborative research with foreign companies (Global Research Center, General Electric 1997-2008 on several topics concerning polymer science) and national companies (since 2013, Head of Lab4Pack, a joint laboratory Bologna Univ. – Sacmi for research on polymer processing for packaging; other collaboration with IMA, G.D., Tetrapak, Philip Morris).

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I strongly recommend Innovation Takes Root. It's a good opportunity to understand and see what happens in this area of biopolymers. It's an international event and not just on PLA. I think it's well done, well-managed, and well-organized. It was a good investment for me.
Marco Garilli

Innovation Expert - Polymers, Electrolux

I'd definitely come back (to ITR) and recommend it. I think many different industries could learn something from a conference like this - it really is focused on the next level of sustainability.
Maddie Guillory

Vice President, Titan Robotics

It has been a wonderful event; very well organized. I especially appreciate the scheduling of activities, the alternation of speeches, and time to network, which has been one of the key successes from my point of view. We also felt very supported by your team; we had the feeling you believe in what Flo is doing and, for us, that's very important.
Tazio Zerbini

Operations Director, Flo S.p.A.