Thermoplastic polyurethane elastomer（TPU） has been intensively employed in industry

daily life

medical treatment and many other fields contribute to its excellent mechanical and processing properties

and researches on its fire retardant modifications have always been focused. The summary of the research on TPU flame retardant modification not just provide guidance for the development of new methods on TPU flame retardant

but also make further effort on extending its applications. The domestic and international research progress of TPU in flame retardant modification are summarized in this review

especially concentrating on the reactive flame retardant modification and additive flame retardant

meanwhile the features

mechanism and limitations on fire retardant modification are also provided. It is suggested that the reactive flame retardant modification has a long-lasting effect and as well as little effect on the mechanical properties of materials

the modification process

however

is complex and limited. On the other hand

additive flame retardant modification has a simple process and a wide range of sources of flame retardants compared with extensive researches applications compared with the former. Based on the previous study

it is still a hard nut to crack to balance both the flame retardancy and the mechanical properties of TPU. In addition

the mechanism involved in the composite addition of flame retardant needs to be improved deeply. Therefore

it is essential to further study the structure and properties of flame retardants

particularly the organic-inorganic composite flame retardants

and further clarify the flame retardant mechanism aiming to shed light on the reference for the growth of brand-new and efficient TPU flame retardant methods.