Thermal Degradation Behavior of Poly(propylene) with a Novel Silicon‐Containing Intumescent Flame Retardant

Abstract

Summary: A novel intumescent flame retardant (PSiNII), containing silicon, phosphorus and nitrogen, has been synthesized and incorporated into poly(propylene) (PP). The flame retardancy of PP/PSiNII, evaluated by the limiting oxygen index (LOI) value, can be enhanced up to 29.5 vol.‐% from 17.4 vol.‐% with 20% total loading amount of PSiNII. The thermal degradation behavior of PP/PSiNII are investigated by thermogravimetric analysis (TGA) under nitrogen and air, and pressure differential scanning calorimetry (PDSC) under 1.5 MPa of oxygen. The PP/PSiNII‐3 degrades at 400 °C for different time, and the process is investigated by FTIR which indicates there is PO in the char. The morphologies of char formed at 400 °C for 10 min and after LOI test are investigated by scanning electron microscopy (SEM). The morphological structure of the char exhibits the swollen cells in the inner and a smooth outer surface, which do good to the thermal properties and fire performance of PP. The thermal stability of PP is improved by incorporating PSiNII.Inner surface of PP/PSiNII‐3 after LOI test.magnified imageInner surface of PP/PSiNII‐3 after LOI test.

Thermal degradation behaviors and flame retardancy of PC/ABS with novel silicon‐containing flame retardant

“…It is already known that SiO 2 reacts easily with phosphate to yield silicophosphate which is known to stabilize phosphorus species. Former study showed that the barrier properties and thermal stability of the expanded char are most effective in resisting the transport of heat and mass [15,17,29]. The char retards the overflow of the flammable volatiles at high temperature.…”

Halogen-free flame retardants

“…When the loading amount of PSiNII was kept at 15±25 wt%, the mechanical properties were still acceptably high, which suggested that this polymeric flame retardant could be used to offer flame retardant PP grades with good mechanical properties. 75,76 Recently, the design of new, intrinsically flame-retarding polymers that do not contain halogen in the polymer structure has become even more attractive due to their permanent flame retardancy and good mechanical properties.…”

Formulation, rheology and thermal aging of polymer greases—Part II: Influence of the co-thickener content

“…1. These areas, are related to, respectively, Area A : Carbonyl compounds (formation of oxidation products like esters, lactones and ketones [14][15][16][17][18][19] resulting from the degradation of base oil and/or thickener). Area B: Carbon-oxygen compounds like carbonyl, hydroxy and other ester and ether compounds [19].…”