CTMP-based cellulose fibers modified with core–shell latex for reinforcing biocomposites

• Published in: Carbohydrate polymers 2013-06, Vol.95 (1), p.428-433
• Main Authors: Pan, Yuanfeng, Xiao, Huining, Zhao, Yi, Wang, Zhuang
• Format: Article
• Language: English
• Subjects: Acrylic Resins - chemistry; Adsorption; Applied sciences; Biocomposite; biocomposites; Cellulose - chemistry; cellulosic fibers; Composites; Core–shell latex; crystal structure; Crystallization; CTMP; Exact sciences and technology; Forms of application and semi-finished materials; latex; Latex - chemistry; Methylmethacrylates - chemistry; Microscopy, Electron, Scanning; Microscopy, Electron, Transmission; Polymer industry, paints, wood; polypropylenes; Polypropylenes - chemistry; pulp; Reinforcement; Styrene - chemistry; synergism; Technology of polymers; Tensile Strength; thermal properties; Toughening
• ISSN: 0144-8617; 1879-1344
• DOI: 10.1016/j.carbpol.2013.03.014

•Adsorption of cationic latex provides a novel approach for modifying CTMP fibers.•As-modified CTMP is very effective in reinforcing polypropylene-based biocomposite.•Mechanical properties were improved significantly at a low dosage of latex addition.•Modified cellulose fiber improved the computability between fiber and PP matrix.•Synergetic effect on promoting the crystallization of PP was observed. The toughening of cellulose fiber reinforced polypropylene (PP) was performed via adsorbing the cationic latex with core–shell structure onto chemithermomechanical pulp (CTMP) fibers as reinforcements, which is a novel approach for rendering the surface of cellulose fibers elastomeric. The mechanical, morphological and thermal properties of the resulting biocomposites, containing 40% (wt) of the modified fibers, were investigated. The results showed that with the increasing of the latex dosage up to 2% (wt on dry CTMP fibers), the impact, tensile and flexural strengths of the modified CTMP/PP biocomposites were significantly increased. The toughening mechanism was discussed based on the retarding of crack propagation and the promoting of crystallization of PP matrix (as revealed by DSC characterization). The overall performance of the biocomposite demonstrated that cationic latex-modified CTMP fiber is very effective in reinforcing thermoplastic-based biocomposites along with the synergetic effect on enhancing crystallinity of polymer matrix.