The flame-retardant polyamide66 (FR-PA66) was synthesized successfully by reaction of phosphorus-containing flame retardant. Through FTIR

TGA and DTG

SEM

LOI

the structures and properties of these samples were characterized. The FTIR analysis showed that the phosphorus-containing flame retardant was introduced in the PA66’s main chain. The TGA and DTG measurement indicated that the further degradation of FR-PA66 required higher temperature (T

max2

was about 480.56℃) after through the first degradation stage(T

max1

was about 418.59℃)to thermal-degradation. Through LOI and SEM analysis

it was demonstrated that the LOI value of FR-PA66 has been reached 26.7

and FR-PA66 has better char-forming property.