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Synthesis of Additives from Montmorillonite to Modify High Density Polyethylene Final Properties
Author(s) -
Elena Monasterio Fernanda,
Alberto Destéfanis Hugo
Publication year - 2011
Publication title -
macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 1022-1360
DOI - 10.1002/masy.201150314
Subject(s) - silanes , montmorillonite , high density polyethylene , materials science , silane , compatibilization , rheometer , thermogravimetric analysis , chemical engineering , polyethylene , cyclohexane , compounding , fourier transform infrared spectroscopy , nanocomposite , polymer chemistry , composite material , polymer , organic chemistry , chemistry , rheology , polymer blend , engineering , copolymer
Summary: This work brings about the modification of sodium montmorillonite clay (MNa) by the cationic exchange with hexadecyltrimethylammonium to turn it into organophilic clay (MC 16 ). Subsequently, MC 16 was treated with silanes. Three silanes with functional groups of different chemical nature were used. The objective was to determine if the clay could affect high density polyethylene (HDPE) final behavior after being modified with each silane. The following silanes were used: Cl 2 Si(CH 3 ) 2 , Cl 2 Si(CH 3 )(C 6 H 5 ) and Cl 2 Si(C 6 H 5 ) 2 . Finally, in situ hydrolysis was carried out to generate the respective siloxanes. These materials were characterized by XRD, FTIR and GPC analyses. Each one of these additives was mixed using melt compounding processing in a Haake torque rheometer Rheocord 9000 equipped with a mix chamber and roller rotors at 100 rpm and 190 °C. All hybrids were characterized by XRD, SEM and thermogravimetric analyses. Barrier properties to cyclohexane were also determined by pervaporation experiments. Results from all studies showed that the addition of approximately 3 wt% of clay has changed the macroscopic properties of the above‐mentioned composites, as compared with pure HDPE. This can be explained considering the different polymer/filler interactions which take place in each system.