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Development of functional degradable materials by precise crosslinking design of biobased polymers
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Researchers developed starch-based films that exploit hydrogen bond crosslinking to be stable in freshwater but rapidly dissolve in seawater, offering a balance between everyday water resistance and marine biodegradability. This stimuli-responsive design represents a novel approach to reducing marine plastic pollution using biopolymers derived from modified starch and oxidized cellulose.
Abstract Petroleum-based plastics are lightweight and durable and exhibit excellent formability. However, the increase in global plastics production, coupled with the economic development of emerging countries, and the resulting marine pollution caused by plastic waste have become serious problems in recent years. Polysaccharides, such as starch and cellulose, are the most abundant biopolymers in nature and are particularly promising plastic alternatives owing to their renewability, sustainability, and biodegradability. However, owing to their lack of water resistance and adequate mechanical properties, large-scale application of polysaccharide films in single-use plastics is limited because water resistance is preferred in many daily scenarios. Further research is required to optimize bioplastics to make them economically and practically feasible. In this report, we focus on stimuli-responsive materials that form or dissociate cross-linked structures in response to slight changes in external stimuli or the environment. We developed starch-based films with different disintegration/dissolution rates in freshwater and seawater as environmentally friendly materials. Modified starch was mixed with oxidized cellulose or a water-soluble polymer to prepare a transparent, homogeneous film. After the introduction of hydrogen bonds, the starch complex film was stable in freshwater; however, in seawater, the hydrogen bond crosslinks dissociated, causing the film to dissolve rapidly. This technology balances degradability in marine environments with water resistance in everyday environments, providing an alternative means of reducing marine plastic pollution, and it is expected to be applied in a variety of industrial sectors.
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Uniformly crosslinked algal bioplastic with triggerable decomposition in salt water
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Researchers developed a uniformly crosslinked algal bioplastic designed to decompose on demand when exposed to salt water, presenting this material as a strategy to reduce marine plastic pollution and limit microplastic formation in ocean environments.
Starch‐Based Polymer Composites for Sustainable Food Packaging: Advances in Bioplastic Development
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This review examined production mechanisms, structural modifications, and industrial applications of starch-based bioplastics for food packaging, discussing the role of plasticizers and physical and chemical treatments that enhance hydrophobicity, mechanical strength, and thermal stability. While starch-based bioplastics offer biodegradability and renewable origins supporting a circular economy, the review concluded that trade-offs with food production feedstocks and higher manufacturing costs compared to conventional plastics mean they are not a complete long-term solution to plastic pollution.
Starch-based bioplastic with controlled physical properties and marine decomposition
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Scientists engineered a plant-starch plastic (from tapioca) that actually breaks apart and biodegrades in ocean water, unlike many "biodegradable" plastics that just sit there for years. By tweaking the starch's chemistry, they could control how fast it falls apart versus how fast it's actually broken down by ocean microbes—two different processes that matter for reducing marine plastic pollution and, ultimately, the microplastics that end up in seafood and drinking water. This research is a step toward packaging materials that won't linger in the ocean or fragment into the tiny plastic particles increasingly linked to human health conc
Seawater‐Degradable Polymers: Seawater‐Degradable Polymers—Fighting the Marine Plastic Pollution (Adv. Sci. 1/2021)
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This review examines polymers designed to degrade in seawater as a potential strategy to combat marine plastic pollution, covering material properties, degradation mechanisms, and the environmental context of marine microplastic impacts. Even seawater-degradable polymers require careful evaluation since the consequences of marine plastic pollution are still not fully understood.
Structure–property relationships in multifunctional starch/agar biocomposite films reinforced with alkaline–peroxide treated hemp fibers for sustainable applications
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Scientists combined starch, agar (a seaweed-based gel), and hemp fibers to create a plant-based alternative to plastic packaging that breaks down naturally in soil within a few months. The best-performing version—starch mixed with agar and hemp—resisted moisture well and still decomposed significantly, showing promise as a sustainable swap for conventional plastic film. Since plastic packaging is a major source of microplastic pollution that can end up in our food and water, biodegradable alternatives like this could help reduce that exposure over time.
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