Upcycling of polyvinyl chloride into polyalphaolefin lubricants.

August 5, 2026| Source: Nature

Polyvinyl chloride (PVC) is a thermoplastic used ubiquitously in households and industry owing to its light weight, mechanical strength, durability, low cost and ultraviolet and fire resistance 1,2 . With a production volume of about 60 million tonnes annually 2 , post-consumer and post-industrial PVC waste pose marked environmental challenges, such as leaching chlorohydrocarbons and additives, which contaminate groundwater and soil 1-4 . To address the formidable challenge of recycling PVC and achieving carbon circularity, valorization into high-value products is essential to mitigate the associated costs and offer high financial incentives for reusing plastic waste 5-14 . Here we report a method for upcycling PVC into high-value lubricants with controllable viscosities. Using AlCl 3 at a mild temperature of 70 °C, PVC undergoes dechlorination, alkylation and chain scission, producing vinyl-derived polyalphaolefins (vPAO). PVC serves as an effective template for the alkylation of α-olefins of various chain lengths, producing vPAO with limited short branches in the backbone without the need for metallocene catalysts essential to current PAO technology. The PVC-derived lubricants exhibit tunable molar masses, kinematic viscosities at 100 °C (KV 100  ≈ 14.9-26.3 centistokes), a low coefficient of friction (COF ≈ 0.08-0.15) and a high viscosity index (VI up to 130). This work highlights an economical approach to using PVC as a low-cost feedstock to synthesize high-value lubricants with superior tribological properties, meeting the demand for sustainability in both the plastic and lubricant industries.

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Nutrient legacies from elephant megacarcasses create coldspots of biodiversity and hotspots of ecosystem processes.

Terrestrial megafauna (animals >1,000 kg) have substantial impacts on ecosystems while alive; yet, we know little about the impacts of these ecosystem engineers after they die. Like whale carcasses in the ocean, terrestrial megacarcasses may leave ecological legacies via the nutrient pulses they create on the landscape. Here, we investigated the impact of elephant megacarcasses on savanna ecosystems in Kruger National Park, South Africa. To determine how elephant carcasses affect below- and a

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EnvironmentOctober 13, 2026

Continuous UV irradiation played an inconclusive role in selecting the canonical genetic alphabet.

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