New methods for flame-retarding PET without melt dripping

Abstract

Comparisons of indoor active and passive air sampling methods for emerging and legacy halogenated flame retardants in Beijing, China offices Emerging Contaminants 2, 80 (2016);

A key role of a bio‐based charring‐coupling agent in flame retardant and anti‐dripping performance of polyamide 6/aluminum diethylphosphinate

“…To inhibit the fluidity of thermoplastic polymers at high temperature, two methods are usually used: (1) adding anti‐dripping agents such as polytetrafluoroethylene, inorganic nanoparticles (silicate, graphene, expandable graphite, etc.) into polymer, and increase the internal cross‐linking point of the polymer through physical viscosity increasing effect to thicken the polymer melt, so as to achieve the purpose of inhibiting the melt dripping 25,26 ; (2) incorporating cross‐linkable groups into the polymer structure, promote its cross‐linking reactions at high temperature to form char and inhibit the melt dripping 27 . In addition, charring agents are often added into the polymer, and increase the viscosity to inhibit melt dripping 28 …”

“…into polymer, and increase the internal cross-linking point of the polymer through physical viscosity increasing effect to thicken the polymer melt, so as to achieve the purpose of inhibiting the melt dripping 25,26 ; (2) incorporating cross-linkable groups into the polymer structure, promote its cross-linking reactions at high temperature to form char and inhibit the melt dripping. 27 In addition, charring agents are often added into the polymer, and increase the viscosity to inhibit melt dripping. 28 If an interface structure with flame retardancy and charring effect are constructed between PA6 and ADP which should be helpful to improve the interface adhesion and suppress the melt dripping of PA6/ADP blends.…”

Flame retardancy of PET foams manufactured from bottle waste

“…UL94 test) due to the presence of heteroatoms in the backbone [18]. It is therefore not surprising that foaming [19][20][21][22] and flame retardancy [23][24][25][26] of recycled PET are both intensively researched areas. However, at the intersection of the two developments, i.e.…”

“…The reduced molecular mass of recycled PET can be further degraded by the flame retardants used [27], resulting in inadequate stabilisation during foaming and cell collapse [28]. Depending on the type and amount of flame retardant, the decrease in intrinsic viscosity (IV) can be as high as 0.6-1.0 dL g −1 [25,26], resulting in a significant decrease in melt strength. To compensate degradation, multifunctional chain extenders can be used, which form molecular branches, so that higher porosity can be achieved due to the increased viscosity and melt elasticity [27,29].…”

Targeted Copolymerization in Amorphous Regions for Constructing Crystallizable Functionalized Copolymers

“…As an important branch in polymer science, functionalization of general polymers has attracted significant attention for their high added value and special applications. − A common pathway of synthesizing functionalized polymers is to chemically introduce functional units into their molecular chain via simultaneous or cascade approaches, − such as step-growth, 4, , free-radical, 5, and ring-opening ,, polymerizations. However, these methods are normally random for the distribution of functional units due to nonselective chemical binding.…”