Poster Presentations at International Conferences


green Thermosets – Nanocomposites of Rosin/Maghnite









Visits Portugal &




Polymer Connect Lisbon 2020 (Poster)


Green Nanocomposites Prepared with Rosin-Limonene copolymer and Algerian Clay (Maghnite-CTAB)

  Derdar HHodhaifa 1, 2, Geoffrey Robert Mitchell 3, Meghabar Rachid 2, Bachari Khaldoun 1

1 Centre de Recherche Scientifique et Technique en Analyses Physico-Chimiques    (CRAPC), BP 10 384, Siège ex-Pasna Zone Industrielle, Bou-Ismail CP 42004, Tipaza, Algeria.

2 Laboratoire de Chimie des Polymères, Département de Chimie, FSEA, Oran1 University Ahmed Benbella BP N° 1524 El M’Naouar, 31000 Oran, Algeria.

3 Centre for Rapid and Sustainable Product Development, Institute Polytechnic of Leiria,

Marinha Grande, Portugal.

The aim of this work is to prepare green thermosets using two natural sustainable and cheap materials (Rosin and Maghnite). The rosin is a solid form of resins obtained from pines and similar types of plants belonging to the conifer family, produced by heating fresh liquid resin to vaporize the volatile liquid terpene (large group of unsaturated hydrocarbons). The Maghnite is natural clay from the montmorillonite family that comes from the region of Maghnia (Telemcen-Algeria). The propos of those modifications is on one hand to enhance the thermal and the mechanical properties of the rosin and on the other hand to make both the rosin and the Maghnite suitable for the preparation of nanocomposites. The synthesis of green nanocomposites using Rosin-Limonene as a copolymer and Maghnite as a nanorenfort was done by two steps; first we polymerize limonene by cationic polymerization using Maghnite-H+ as a catalyst. The FT-IR and H-NMR have confirmed the polymerization of limonene. The obtained polymer is intercalated in the clay sheets. Afterwards, the Rosin is added to the reaction mixture in order to synthesize copolymers- nanocomposites/ clay and to extract a green material from a green raw material (limonene, Rosin and clay). Following the same procedure we use Maghnite-CTAB for the synthesis of nanocomposites limonene-rosin/clay by in situ polymerization. The obtained nanocomposites were characterized by FT-IR, TGA, XRD and SEM analysis.

RESIM 2018 (Virtual Conference)

Rosin the ultimate green material

Dora Sousaa1, Vidhura Mahendraa2, Geoffrey Mitchella3*

aCentre for Rapid and Sustainable Product Development, Institute Polytechnic of Leiria, 2430-028 Marinha Grande Portugal,,



Keywords: Green Chemistry, sustainability, bioplastics, biodegradable

There is a massive world-wide demand for sustainable materials, in particular, for those materials which exhibit biodegradability to avoid the current problems of plastics in the oceans. Before we can transform the materials supply chain it is helpful to reflect on the particular properties which have made polyolefin based polymers so successful. It is clear that  just having a suitable material is not sufficient, we need the manufacturing processes which successfully produces objects and we need the appropriate designs for those materials. It is the case that the use of high performing polyolefins are essential for the continued safe supply of water and electrical power. However, we need to be more discriminating in our use of materials through appropriate design to deliver the needs for example in the field of packaging. This is an underdeveloped area of bioplastics. We review the short comings in this respect with regard to available bioplastics. We caution against seeing bioplastics as a straight swap with existing plastics. Many bioplastics will not degrade in the oceanic environment.

In this presentation we explore the potential of rosin as a resource for the preparation high performance materials. Rosin is obtained by a green processing methodology from the resin which can be obtained from the resin obtained by tapping pine trees.  Fifty year ago was the leading net exporter of Rosin in the world. However, recently the resin industry in Portugal has faced numerous economic issues due to the high cost of labour involved in the rosin extraction process coupled with the availability of cheaper imports from China and other countries. In addition, there has been a loss of cultivated pine trees as the land has been used for other cash crops such as eucalyptus which exhibits a faster growth as opposed to pine and is therefore more productive. These challenges have changed Portugal from being a leading exporter of rosin to a net importer. At CDRSP-IPLeiria we have launched an active research programme in this area. We plan to address the challenges identified above through the development of value-added materials based on the products of the forest, in particular rosin which is sometimes referred to as colophony.