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how to demold resin
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Hannah from LA Ink, whose full name is Hannah Tatum, is originally from Oklahoma, U.S. Before gaining fame on the reality TV show "LA Ink," which aired on TLC from 2007 to 2011, she worked at the renowned Los Angeles tattoo parlor, High Voltage Tattoo, owned by fellow tattoo artist and show star, Kat Von D. Despite being known for her work in L.A., Hannah's roots are firmly planted in Oklahoma, where she developed her passion for tattooing. After the show, she continued her career in the tattoo industry, moving to different locations and even opening her own tattoo studio. Her journey from Oklahoma to becoming a prominent figure in the tattoo world through "LA Ink" has been quite remarkable.
Yes, polyvinyl chloride (PVC) can be cross-linked, although it is less commonly done compared to other polymers like polyethylene. Cross-linking PVC improves its thermal stability, mechanical properties, and chemical resistance. This process can be achieved through various methods, including chemical cross-linking, radiation, and the use of peroxides. Chemical cross-linking involves adding cross-linking agents during the polymerization or blending process. Radiation, including electron beam and gamma radiation, induces cross-linking by creating free radicals. Peroxide-based cross-linking, on the other hand, involves decomposing organic peroxides to form radicals that facilitate the cross-linking process. Cross-linked PVC (PVC-XL) finds applications in areas requiring enhanced material properties, such as in high-temperature cables and specialty tubing.
Isotactic polypropylene is a type of polypropylene where all the methyl groups are positioned on the same side of the polymer chain. This regularity in structure grants isotactic polypropylene a high degree of crystallinity, making it more rigid and heat-resistant than its atactic (randomly arranged methyl groups) or syndiotactic (alternating arrangement) counterparts. Its uniform structure enables better packing of the polymer chains, contributing to its strength and making it suitable for a wide range of applications, including packaging, fibers, and automotive parts. The strategic arrangement of its molecular chains is a result of specific catalysts used in the polymerization process, which control the placement of the methyl groups. Isotactic polypropylene’s properties make it a versatile material in the plastics industry, offering a combination of durability, resistance, and processability.
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