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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Preparation of Extruded Melt-Mixed Polypropylene/Montmorillonite Nanocomposites with Inline Monitoring

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Bertolino, Marcelo K. [1] ; Canevaro, Sebastiao V. [2]
Total Authors: 2
[1] Univ Fed Sao Carlos, Programa Posgrad Ciencia & Engn Mat, BR-13560 Sao Carlos, SP - Brazil
[2] Univ Fed Sao Carlos, Dept Mat Engn, BR-13560 Sao Carlos, SP - Brazil
Total Affiliations: 2
Document type: Journal article
Source: POLYMER ENGINEERING AND SCIENCE; v. 50, n. 3, p. 440-445, MAR 2010.
Web of Science Citations: 8

This article advances the use of an inline optical detector to monitor the disaggregation of the montmorillonite (MMT) clay tactoids during the preparation of polypropylene (PP)/MMT nanocomposites via polymer melt compounding. During the exfoliation of the tactoids their size are reduced below the minimum particle size to produce light extinction and so, the signal of the inline detector reduces as the nanosize composite is formed. The measurement is done at the transient state with the MMT clay added as a pulse with constant weight into the PP extrusion melt flow and followed by the optical detector. The data comes out as the common residence time distribution curves having its maximum intensity related to the tactoids average particle size, keeping all other variables constants. The light extinction was measured for composites with different clays (Cloisite (R) 15A, 3013, Na(+), and Sintered 20A) using the same PP grafted with maleic anhydride compatibilizer. The dissaglomeration/exfoliation efficiency increases as: ``Sintered 20A{''} < ``Na+ clay{''} < ``organo-modified clay{''} < ``organo-modified clay + compatibilizer{''}. The best result is obtained using Cloisite (R) 15A and Cloisite (R) 20A following the expected reduction of the particle size obtained during a nanocomposite melt processing. POLYM. ENG. SCI., 50:440-445, 2010. (C) 2009 Society of Plastics Engineers (AU)

FAPESP's process: 06/61008-5 - Nanostructure polymeric systems: processing and properties
Grantee:Rosario Elida Suman Bretas
Support type: Research Projects - Thematic Grants