Bio-based fibres have long carried an uncomfortable contradiction: the closer their mechanical performance gets to conventional synthetics, the slower they tend to biodegrade. The 2026 Paul Schlack Prize, awarded to Momo Naeimirad of Netherlands-based Senbis Polymer Innovations, addresses exactly this tension. Her PolyBioDeg research examines the quantitative relationship between the structure, properties and biodegradation of melt-spun bioplastic fibres. The award was presented at the 65th Dornbirn Global Fiber Congress, held in Austria from September 16 to 18.
An Underestimated Technical Bottleneck
Melt spinning is a mature process for polyester and polyamide, but transferring it to bio-based polymers changes the equation. Molecular chain regularity, crystallinity and orientation all strongly influence how a fibre degrades. To keep a fibre from breaking during spinning and weaving, crystallinity and orientation must be raised. But as those two metrics climb, the attack sites available to microbes and enzymes shrink, and the degradation cycle stretches out.
This means a "biodegradable" label can behave very differently in a laboratory versus a real landfill or composting environment. For buyers, relying solely on a supplier's degradation certificate while ignoring mechanical specifications and end-of-life scenarios can lead to a mismatch: an environmentally friendly material at purchase, but a stubborn plastic-like residue at disposal.
A Route Signal from European Fibre Research
The Dornbirn Global Fiber Congress has long served as a barometer for Europe's fibre technology direction. Giving this year's award to degradation mechanism research rather than capacity or cost breakthroughs suggests the upstream textile sector is shifting focus from "can we make it" to "can we truly close the loop."
This shift will ripple through the supply chain along three paths. First, bio-based chip and masterbatch suppliers will need to provide finer structural parameters, not just bio-based content percentages. Second, spinning mills will have to revisit their process windows, since draw ratios and heat-setting temperatures must be recalibrated for different bio-based polymers on the same melt-spinning equipment. Third, brand material admission standards may evolve from "how much recycled or bio-based content" to "what is the degradation half-life under a specified disposal scenario."
The Netherlands has built early strength in bio-based polymers and circular textiles, and outcomes from research institutions like Senbis often reach pilot and commercial scale within three to five years. For Chinese textile firms, this is both a technology signal and a front-end variable for export compliance.
Practical Impact on the Value Chain
In the short term, this research will not directly alter procurement prices for bio-based fibres. Feedstock costs for bio-based polyester and polyamide remain above petroleum-based equivalents, and melt-spun bioplastic fibres still account for a very small share of output. In the medium term, however, once quantitative degradation evaluation becomes a methodology, it could be absorbed into EU ecodesign regulations and textile strategies, becoming a technical threshold for market access.
For upstream fibre producers, the real challenge is not whether they can make bio-based fibres, but whether they can balance mechanical performance and controlled degradation on the same melt-spinning line. This demands closer collaboration between process engineers and polymer scientists, rather than treating bio-based as a simple feedstock swap.
For downstream fabric and garment companies, it is time to build internal material databases that record strength, elongation, thermal shrinkage and degradation rates across different bio-based fibres, so they can respond quickly when brands inquire.