{"id":11871,"date":"2026-09-16T08:52:09","date_gmt":"2026-09-16T06:52:09","guid":{"rendered":"https:\/\/www.adesiviesigillanti.it\/issue-2-2026\/2-ch-bioforce-3-26\/"},"modified":"2026-09-16T15:29:23","modified_gmt":"2026-09-16T13:29:23","slug":"2-ch-bioforce-eng-3-26","status":"publish","type":"page","link":"https:\/\/www.adesiviesigillanti.it\/en\/issue-2-2026\/2-ch-bioforce-eng-3-26\/","title":{"rendered":"2-CH-BIOFORCE eng 3-26"},"content":{"rendered":"\t\t
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Lignin as promising building blocks\nfor pressure-sensitive adhesives<\/h1>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Lari V\u00e4h\u00e4salo
CH-BIOFORCE<\/strong><\/span><\/h5>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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A new peer-reviewed study has explored how lignins produced with CH-Bioforce\u2019s Bioforsense\u00ae <\/span> technology can be transformed into soft, functional materials for pressure-sensitive adhesives (PSA). These adhesives are widely used in everyday products such as sticky notes, labels, tapes and the well-known Blu Tack\u00ae<\/span> .
The research investigated lignins from birch, spruce and wheat straw, all produced with the CH-Bioforce process, and evaluated how they perform when grafted with poly(n-butyl acrylate) (PnBA). The work highlights how bio-based lignin can replace fossil-based polymers in entirely new adhesive applications.<\/p>

MODIFIED LIGNINS SUCCESSFULLY GRAFTED WITH POLYACRYLATE
<\/span><\/strong>The researchers first prepared lignin-based macroinitiators and then grafted them with PnBA using ATRP polymerisation. The study confirmed:
– successful lignin\u2013polyacrylate grafting, verified through FTIR, NMR and SEC\/GPC.
– Clear differences between hardwood, softwood and straw lignins in macroinitiator formation and polymerisation efficiency.
– Birch and spruce lignins showed the most effective copolymerisation behaviour, while wheat straw lignin displayed lower reactivity due to structural complexity.
Gel permeation chromatography further demonstrated clear molecular-weight shifts, distinguishing true copolymers from simple blends.

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THERMAL AND RHEOLOGICAL PROPERTIES SUPPORT ADHESIVE PERFORMANCE
<\/span><\/strong>The resulting lignin-g-PnBA copolymers displayed:
– increased glass-transition temperatures compared to pure polyacrylate.
– Structural differences between lignin sources reflected in their thermal decomposition profiles.
– Strong viscoelastic behaviour, with birch-based copolymers showing particularly good performance in rheology tests.
– Compliance with the Dahlquist criterion, the established requirement for pressure-sensitive adhesives (low modulus under deformation).
Notably, birch-lignin-based materials (BLNBA2 and BLNBA4) showed adhesive behaviour comparable to commercial Blu Tack\u00ae<\/span> , confirming excellent tack and softness in real-world use.

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LIGNIN AS A RENEWABLE ROUTE TO SOFT, FUNCTIONAL ADHESIVE MATERIALS
<\/span><\/strong>This study provides strong evidence that CH-Bioforce lignins can be converted into soft, elastic materials suitable for PSA applications. Unlike conventional petroleum-based polymers, lignin offers: Rapid renewability, a high-value outlet for side streams, the potential to reduce fossil-based content in consumer products and a compatibility with circular economy principles. By demonstrating high-performing, lignin-based PSA materials, the research opens the door to sustainable alternatives for everyday adhesive products.<\/p>

ACKNOWLEDGMENT
<\/span><\/strong>Doctoral thesis (\u00c5bo Akademi University), Bhadane, Rupali: \u201cStructure and Properties of Lignin from Biomass Waste and Engineering of Sustainable Acrylic Adhesives\u201d, https:\/\/urn.fi\/URN:ISBN:978-952-12-4720-0.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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DOWNLOAD THE PDF FILE<\/span><\/strong><\/a><\/h5>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t
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Other contents<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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EMANUELE MASCHERPA SPA<\/a><\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Sealing and bonding railway carriage floors\nwith high-performance\ntwo-component adhesives<\/a><\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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UNIVERSIT\u00c0 DI TRENTO<\/a><\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Development of novel self-healing adhesives\nfor potential use in wind turbine blades<\/a><\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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KIILTO<\/a><\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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New polyurethane adhesives match\nthe pace of sandwich panel manufacturing\nfor the transportation industry<\/a><\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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FRAUNHOFER IAP<\/a><\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Microencapsulated adhesives -\nBonding at the push of a button<\/a><\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Lignin as promising building blocks for pressure-sensitive adhesives Lari V\u00e4h\u00e4saloCH-BIOFORCE A new peer-reviewed study has explored how lignins produced with CH-Bioforce\u2019s Bioforsense\u00ae technology can be transformed into soft, functional materials for pressure-sensitive adhesives (PSA). These adhesives are widely used in everyday products such as sticky notes, labels, tapes and the well-known Blu Tack\u00ae .The research […]<\/p>\n","protected":false},"author":9,"featured_media":0,"parent":11203,"menu_order":1,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-11871","page","type-page","status-publish","hentry"],"yoast_head":"\n2-CH-BIOFORCE eng 3-26 - Adesivi & Sigillanti<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.adesiviesigillanti.it\/en\/issue-2-2026\/2-ch-bioforce-eng-3-26\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"2-CH-BIOFORCE eng 3-26 - Adesivi & Sigillanti\" \/>\n<meta property=\"og:description\" content=\"Lignin as promising building blocks for pressure-sensitive adhesives Lari V\u00e4h\u00e4saloCH-BIOFORCE A new peer-reviewed study has explored how lignins produced with CH-Bioforce\u2019s Bioforsense\u00ae technology can be transformed into soft, functional materials for pressure-sensitive adhesives (PSA). 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