Hyperbranched polymers : compatibilizer and surface treatment to magnesium hydroxide flame retardant in polyolefin poly

1. Hyperbranched polymers : compatibilizer and surface treatment to magnesium hydroxide flame retardant in polyolefin polymers Gil Bechor Prof. Hanna Dodiuk Nurit Kornberg. Dr

2. Introduction • Polymers in every day use, are exposed to fire. • Flame retardants (FR) became a significant interest in the plastic world.

3. Today the FR agents are found in every product around us.

4. Fire occurs in the gaseous phase of every substance. Gas,smoke and leakingof burning polymers, became a top priority in the development of flame retardant agents.

5. The FR agents are divided into two groups: Organic halogen-containing FR Inorganic halogen-free FR agents The Brominated organic FR (Br-FR) is commonly used today. • (a) polybrominated diphenyl ethers (PBDEs) • (b)hexabromocyclododecan (HBCD) • (c)tertabromobisphenol-A (TBBPA) • (d) banned to use polybrominated bipheyls (PBBs)-

6. With the "green revolution", Environmental legislations limited the use of Br-FR in polymer materials due to increasing concern.

7. Inorganic halogen free FR, such as Magnesium Hydroxide (MH), attracted researchers. Mg(OH)2(s) MgO(s) + H2O(g) 1244 J/g • These Three products work together to achieve the FR properties • The quantity of MH filler, the dispersion and distribution became a problem in polymer matrix. MgO Mg(OH)2

8. Lack of compatibility andthe amount ofMH influence the physical properties and the processability of the polymers. • Surface treatment was applied to compensate this problem. • The search for a suitable surface treatment came across different kinds of materials. • The surface treatments used today include silane coupling agents, stearic acids, titanate coupling agents, elastomers, etc.

9. Dendrimers and hyperbranched polymers • A branched organic substance with great potential due to many functional end groups.

10. The dendritic polymer family consists of three groups - Dendrimers, Dendrigrafts and Hyperbranched polymers (HBP). • The term dendrimer is derived from the Greek words 'dendron' (tree) and 'meros' (part/ unit).

11. They all have architectural similarity, as they consists of three distinct areas: • The polyfunctional central core • Repeating units (also called generations) • End-standing groups or terminal groups

12. These three areas can be formed into an infinite series of dendritic materials with infinite properties.

13. HBP serves in a variety of thermosetting and thermoplastic polymer uses: • HBP as Drug Delivery • HBP as crosslinker in PU network blown film. • HBP as processing aid in LLDPE blown film.

14. Different HBP applications and uses.

15. Objective Harness the HBPs potential in order to: • Enhance MH FR properties • Improve dispersity • Improve mechanical and physical properties

16. Experimental • Surface treatments to MH with HBPs and characterization • An attempt to Mix the treated MH with PP • Primary mechanical and physical testing

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