Japanese scientists have developed a new type of plastic that dissolves completely in seawater within a matter of hours, leaving no harmful microplastics behind. This biodegradable plastic, made from cellulose nanofibers and a bio-based polymer, disintegrates rapidly in alkaline conditions similar to ocean water, offering a potential solution to plastic pollution. Unlike conventional biodegradable plastics that require high temperatures for composting, this new material breaks down in regular seawater, making it suitable for a wider range of applications.
Researchers have developed a more sustainable method for creating durable plastics like those used in cars and electronics. This new polymerization process, detailed in Nature Chemistry, uses readily available and recyclable catalysts, operates at room temperature, and avoids harmful solvents. The resulting poly(dicyclopentadiene) exhibits similar strength and heat resistance to traditionally produced versions, offering a greener alternative for this important class of materials. This advancement could significantly reduce the environmental impact of producing durable plastics, paving the way for wider adoption of sustainable manufacturing practices.
Hacker News users discussed the potential impact and feasibility of the new polymerization process. Some expressed skepticism about the "infinitely recyclable" claim, pointing to the energy costs and potential degradation of the plastic over multiple recycling cycles. Others questioned the economic viability, wondering if the process would be cost-competitive with existing plastics. A few commenters brought up the issue of microplastic pollution, noting that even recyclable plastics contribute to this problem. Several users highlighted the need for lifecycle assessments to fully understand the environmental impact. There was also interest in the specifics of the depolymerization process and its potential applicability to other types of plastic. Overall, the comments reflected a cautious optimism tempered by a pragmatic understanding of the challenges in developing and implementing truly sustainable plastic solutions.
This video tests the adhesion of various glues on PETG 3D printed parts. The creator bonds two PETG cubes with each adhesive, lets them cure, and then attempts to break the bond using a calibrated force gauge. Tested adhesives include super glue, epoxy, UV cure resin, and various specialized plastic glues. The video documents the force required to break each bond and declares a winner based on highest break strength.
The Hacker News comments on the PETG adhesive test video largely discuss the efficacy of different adhesives for PETG, comparing the results shown in the video with their own experiences. Cyanoacrylate (super glue) is generally agreed to be unsuitable, while specialized PETG glues or more general-purpose plastics adhesives like MEK are favored. Some commenters debate the merits of different brands and application techniques, emphasizing the importance of surface preparation and clamping. Others offer alternative joining methods like solvent welding or mechanical fasteners, particularly for structural applications. A few comments also touch upon the video's production quality and presentation style, with some finding it overly long.
Summary of Comments ( 35 )
https://news.ycombinator.com/item?id=43505626
Hacker News commenters express skepticism about the new plastic's viability. Several question the practicality of a material that dissolves in seawater for applications like fishing nets, given the constant exposure to saltwater. Others raise concerns about the potential for accidental dissolution due to rain or humidity, and the lack of clarity regarding the byproducts of the dissolving process and their environmental impact. Some doubt the feasibility of large-scale production and cost-effectiveness, while others point out the existing problem of managing plastic waste already in the ocean, suggesting that focusing on biodegradable plastics might be a better long-term solution. There's also discussion about the ambiguity of the term "dissolves" and the need for more rigorous scientific data before drawing conclusions about its effectiveness. Finally, some suggest alternative uses for this type of plastic, such as dissolvable sutures or temporary structures.
The Hacker News post titled "Japanese scientists create new plastic that dissolves in seawater overnight" generated a significant discussion with a variety of comments. Many users expressed skepticism and raised critical questions about the practicality and potential environmental impact of this new plastic.
Several commenters questioned the actual breakdown products of the plastic and whether it truly dissolves or simply breaks down into microplastics, which could be even more harmful to the marine environment. They pointed out that the article lacks crucial details on the chemical composition of the byproducts and the specific mechanisms of degradation. Some users suggested that the term "dissolves" might be misleading and requested further scientific evidence to support the claim.
The feasibility of using this plastic for real-world applications was another major point of contention. Commenters highlighted the challenges of manufacturing and handling a material that is so readily soluble in saltwater. They raised concerns about its durability and suitability for packaging and other common plastic uses, especially given the presence of humidity and moisture in many environments. Questions were also raised regarding the cost-effectiveness of producing this new plastic compared to existing alternatives.
Some users expressed concerns about the potential for accidental dissolution and the implications for waste management. They questioned how this plastic would be handled in recycling systems and whether it could contaminate other materials.
A few commenters also touched upon the broader issue of plastic pollution and questioned whether this new material is a genuine solution or merely a distraction from the need to reduce plastic consumption. They argued that focusing on biodegradable plastics might discourage efforts to develop more sustainable practices and reduce overall plastic usage.
While some comments expressed cautious optimism about the potential benefits of this new plastic, the overall sentiment reflected a healthy dose of skepticism and a demand for more concrete scientific data before drawing any firm conclusions. Many users called for further research and independent verification of the claims made in the article.