نوع مقاله : تالیفی
نویسندگان
1 گروه مهندسی شیمی و پلیمر دانشگاه یزد
2 گروه مهندسی شیمی و پلیمر/دانشگاه یزد/یزد
چکیده
کلیدواژهها
عنوان مقاله [English]
نویسندگان [English]
P olyolefins (POs) are one of the most widely used classes of polymeric materials with
low flammability. Today, the use of halogen-free retardants (HFFRs) for polyolefins
is important due to the environmental problems of halogen additives. Halogen-free flame
retardants are divided into several categories, which the most important include phosphorusbased
types, minerals, nitrogen, silicon, boron, and intumescent systems. In this article,
the operation mechanism and performance of these additives as the flame retardants for
POs-based systems are reviewed. The results show that in order to achieve the desired
flame resistance properties for polyolefins, due to the relatively low efficiency of most
halogen-free flame retardant compounds, large amounts are used in the formulation,
resulting in a significant decrease of thier mechanical properties. To overcome this problem,
combinations of halogen-free flame retardants with synergistic effect should be used for
POs. Based on the studies, it has been found that intumescent systems are the most effective
additives, along with most of the halogen-free additives to achieve the synergistic effect
in creating flame resistance for polyolefins. This synergistic effect is created by the solid
phase mechanism and the strengthening of the protective coating in this phase due to the
presence of a intumescent systems.
کلیدواژهها [English]
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