Lignin-Grafted Poly(n-Butyl Acrylate) Copolymers as Soft Materials for Adhesive Applications: A Comparison of Hardwood, Softwood, and Straw Lignin.

IF 5.5 2区化学 Q1 BIOCHEMISTRY & MOLECULAR BIOLOGY

Biomacromolecules Pub Date : 2025-06-12 DOI:10.1021/acs.biomac.5c00061

Rupali Bhadane, Oskar Backman, Peter Uppstu, Jan-Henrik Smått, Chunlin Xu, Patrik C Eklund

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Abstract

Lignin from birch (BLN), spruce (SLN), and wheat straw (WSLN) was first converted into bromoisobutyrate-based macroinitiators (LNBr) and subsequently grafted with n-butyl acrylate (LNBA) copolymers via atom transfer radical polymerization (ATRP). The influence of hardwood, softwood, and straw lignin on the properties of the copolymers was investigated in terms of thermal behavior, rheology, and tack test. Structural analysis by FTIR, NMR, and SEC/GPC confirmed successful grafting and an increased and broad molecular weight distribution. Thermal analysis (DSC and TGA) showed increased glass transition temperatures (T_g) and different thermal degradation compared to the homopolymer poly(n-butyl acrylate). Additionally, BLN-based copolymers with varying degrees of polymerization (2, 4, and 10) were synthesized to optimize the material properties. The copolymers showed adhesive properties for all BLNBA and SLNBA variants, with BLNBA2 and BLNBA4 meeting the Dahlquist criteria for pressure-sensitive adhesives.

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木质素接枝的聚丙烯酸正丁酯共聚物作为胶粘剂的软质材料：硬木、软木和秸秆木质素的比较。

首先将桦木（BLN）、云杉（SLN）和麦秸（WSLN）中的木质素转化为基于溴异丁酸盐的大引发剂（LNBr），然后通过原子转移自由基聚合（ATRP）接枝丙烯酸正丁酯（LNBA）共聚物。研究了硬木、软木和秸秆木质素对共聚物的热性能、流变性能和粘性测试的影响。FTIR， NMR和SEC/GPC的结构分析证实了成功的接枝和增加和广泛的分子量分布。热分析（DSC和TGA）表明，与均聚物聚丙烯酸正丁酯相比，玻璃化转变温度（Tg）升高，热降解程度不同。此外，还合成了不同聚合度（2、4和10）的bln基共聚物，以优化材料性能。该共聚物对所有BLNBA和SLNBA变体均具有粘附性能，其中BLNBA2和BLNBA4符合Dahlquist压敏胶粘剂标准。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Biomacromolecules 化学-高分子科学

CiteScore

10.60

自引率

4.80%

发文量

417

审稿时长

1.6 months

期刊介绍： Biomacromolecules is a leading forum for the dissemination of cutting-edge research at the interface of polymer science and biology. Submissions to Biomacromolecules should contain strong elements of innovation in terms of macromolecular design, synthesis and characterization, or in the application of polymer materials to biology and medicine. Topics covered by Biomacromolecules include, but are not exclusively limited to: sustainable polymers, polymers based on natural and renewable resources, degradable polymers, polymer conjugates, polymeric drugs, polymers in biocatalysis, biomacromolecular assembly, biomimetic polymers, polymer-biomineral hybrids, biomimetic-polymer processing, polymer recycling, bioactive polymer surfaces, original polymer design for biomedical applications such as immunotherapy, drug delivery, gene delivery, antimicrobial applications, diagnostic imaging and biosensing, polymers in tissue engineering and regenerative medicine, polymeric scaffolds and hydrogels for cell culture and delivery.