Comparative investigation of the ultraviolet stabilization of polycarbonate/poly(acrylonitrile–butadiene–styrene) with different ultraviolet absorbers

Abstract

When polycarbonate (PC)/poly(acrylonitrile-butadiene-styrene) (ABS) blends are exposed to outdoor conditions, they are mainly degraded by sunlight; this is known as photodegradation. It is the ultraviolet radiation in the sunlight that is responsible for the degradation of the blend. To stabilize the blend against the harmful ultraviolet radiation, ultraviolet absorbers (UVAs) are used. In this study, three different UVAs-Tinuvin 1577 (a hydroxyphenyl triazine type), Cyasorb 5411 (a benzotriazole type), and Uvinul 3030 (a cyanoacrylate type)-were compounded with a PC/ABS blend at 240 C with a twin-screw extruder. Accelerated aging of the compounded sample was done by an Atlas Suntest containing xenon lamp. The degradation studies were performed with ultraviolet-visible spectroscopy, attenuated total reflectance/Fourier transform infrared spectroscopy, and yellowing index measurements. The molecular weight of the compounded sample was determined by gel permeation chromatography. It was found that hydroxyphenyl triazine type UVA showed the best results for decreasing the degradation products, oxidation rate, and yellowing of the PC/ABS blend.

Evaluation of Fracture Toughness of Ultraviolet-Irradiated Polycarbonate Using the Essential Work of Fracture Method

“…However, ionizing irradiation may change the mechanical properties of polymers by producing scission or crosslinking, depending on the radiation dose 21 . In PC subjected to thermal degradation 22 , gamma 23 of UV irradiation 24 , scission may occur in the carbonyl group or, with less probability, in the benzene rings. In particular, the characterization of the amount of damage caused by UV irradiation to PC has not yet been performed.…”

“…In fact, cracks propagate in the central region of the fractured surface where "necking" process is taking place. This is followed by plastic tearing, as highlighted of the oxidation index suggests that the macromolecular chains were broken at the carbonyl group 23,24,30 due to UV irradiation but independent of the dose.…”

Polymerizable UV absorbers for the UV stabilization of polyesters. I. Design, synthesis and polymerization of a library of UV absorbing monomers

“…16 Tinuvin 1577 (Figure 3) is one of the most effective UV stabilizers available and is the leading UVA on the market today. 17,18 This TA derivative is manufactured by BASF and is currently the UVA of choice for DuPont Teijin Films (DTF) as an additive to PET. As well as being a powerful UV screen, Tinuvin 1577 exhibits a robust IMHB, it is resilient to polar environments and it has a low yellowing index.…”

“…As well as being a powerful UV screen, Tinuvin 1577 exhibits a robust IMHB, it is resilient to polar environments and it has a low yellowing index. 7,9,17,18 One major limitation concerning the use of Tinuvin 1577, and essentially all other UVAs, is potential leaching of the stabiliser from the polymer whilst the polymer is in use. The loss of additive over time leads to an increase in the rate of UV-induced degradation and deterioration of key polymer properties, and this is of particular concern for applications where polymers are exposed to high levels of UV radiation.…”

A Convenient Protocol for the Synthesis of 2‐(2′‐Hydroxy‐5′‐carboxyphenyl)‐2H‐benzotriazole to Avoid Decarboxylation When Using p‐Hydroxybenzoic Acid as Coupling Component

“…2‐(2‐Hydrophenyl)‐2 H ‐benzotriazole derivatives are a very important class of UV absorbers, and they are widely used as additives in polymers, dyes and pigments, and textile to improve the light stability of the substrates . Introduction of carboxylic groups to UV absorbers can improve their hydrophilicity and enhance the interaction with the substrates .…”