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Polystyrene-Butadiene-Styrene Thermoplastic
Chapter 64
Polystyrene-Butadiene-Styrene Thermoplastic Category: Styrene-butadiene, thermoplastic. General Properties: Polystyrene-butadiene-styrene (SBS) is a hard rubber, a type of copolymer called a block copolymer. Its backbone chain is made up of three segments. The first segment is a long chain of polystyrene, the middle segment is a long chain of polybutadiene, and the last segment is another long section of polystyrene. BASF Styrolux® is a styrene-butadiene block copolymer.[184]
Weathering Properties Styrolux® has effective stabilization to inhibit aging on exposure to oxygen and high temperatures. In diffuse light, parts made from Styrolux® retain their optical and mechanical properties for
many years. However, in outdoor applications the material can be degraded by the high energy content of sunlight, resulting in yellowing and deterioration of mechanical properties. Styrolux® is not recommended for outdoor applications. The time to onset of yellowing can be considerably prolonged by using UV stabilizers.[184] UV-stabilized Styrolux® 656 C was tested next to unstabilized Styrolux® 656 C in a Xenotest 1200 under the conditions of DIN 53387—a filter system corresponding to solar radiation, a black panel temperature of 45◦ C, a relative humidity of 65%, and a dry period of 102 minutes in the cycle. The UV-stabilized material began to show visible color change after 60 days of exposure, and after 120 days the sample was a very dull yellow. The unstabilized Styrolux® 656 C showed visible color change after 14 days of exposure, and after 120 days the sample was bright yellow.[185]
Polystyrene-Butadiene-Styrene Thermoplastic Category: Styrene-butadiene, thermoplastic. General Properties: Polystyrene-butadiene-styrene (SBS) is a hard rubber, a type of copolymer called a block copolymer. Its backbone chain is made up of three segments. The first segment is a long chain of polystyrene, the middle segment is a long chain of polybutadiene, and the last segment is another long section of polystyrene. BASF Styrolux® is a styrene-butadiene block copolymer.[184]
Weathering Properties Styrolux® has effective stabilization to inhibit aging on exposure to oxygen and high temperatures. In diffuse light, parts made from Styrolux® retain their optical and mechanical properties for
many years. However, in outdoor applications the material can be degraded by the high energy content of sunlight, resulting in yellowing and deterioration of mechanical properties. Styrolux® is not recommended for outdoor applications. The time to onset of yellowing can be considerably prolonged by using UV stabilizers.[184] UV-stabilized Styrolux® 656 C was tested next to unstabilized Styrolux® 656 C in a Xenotest 1200 under the conditions of DIN 53387—a filter system corresponding to solar radiation, a black panel temperature of 45◦ C, a relative humidity of 65%, and a dry period of 102 minutes in the cycle. The UV-stabilized material began to show visible color change after 60 days of exposure, and after 120 days the sample was a very dull yellow. The unstabilized Styrolux® 656 C showed visible color change after 14 days of exposure, and after 120 days the sample was bright yellow.[185]