Biopolymer-based nanomaterials
High-performance biopolymer-based nanocomposites have attracted extensive research attention in recent years. This is due to their potential to help the industry achieve its sustainability and recyclability goals. These materials also show enhanced properties and performance due to the inclusion of nanofillers.
A variety of nanofillers have been explored in recent studies, including silica, wollastonite, carbon nanotubes, layered double hydroxide (LDH) metal oxides, graphene oxide, and halloysite nanotubes. Small amounts of nanofillers have been added to composites, typically between 1 and 10 wt%.
Nanofillers enhance the properties of biopolymer composites, such as mechanical, flame retardant, barrier and thermochemical properties. In addition, in order to improve the dispersion and compatibility of the nanofillers, they are chemically treated and/or organically modified.
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LDH is a pristine ceramic with a stacked hydromagnesite Mg(OH) 2 structure in which 2D Mg(OH) 6 sheets are connected by edge sharing between neighboring Mg(OH) 6 octagons. The permanent cationic layer charge is caused by the substitution of some M 2+ ions by M 3+ ions. In the interlayer space, hydrogen bonding attracts water molecules and exchangeable charge-balancing anions.
LDHs, as carriers of supramolecular heterogeneous heterostructures, have received extensive research attention for their ability to absorb organic compounds while exchanging anions. However, they cannot exchange carbonate anions.
Current Challenges in Biopolymers and Polymer Nanocomposites
However, despite some very promising research in the field of biopolymer nanocomposites, there are still some key challenges that researchers must overcome before they can consider fully commercializing these materials.
One of the basic problems is oxidative degradation, which is caused by the presence of nanoparticles. Photo- and thermo-oxidative degradation occurs during preparation and processing as well as during the lifetime of the material.
Nanofillers can accelerate degradation, which limits the large-scale industrialization of biopolymers and polymer nanocomposites. Light stabilizers and antioxidants are usually added to nanocomposites to stabilize them and avoid this critical problem.
Several studies have shown that the presence of organic impurities and/or transition metal ions as well as improper distribution of materials in nanoceramics (e.g., LDH) play a key role in degradation. Improper dispersion can lead to agglomeration and aggregate formation within the nanocomposites. In addition, stabilized particles may become trapped between ceramic layers, leading to deactivation.
Another key issue is the poor thermal stability of stabilized molecules. This can lead to volatilization at high temperatures, which is common during processing. Volatilization causes the stabilizing molecules to migrate from the body to the surface.
Two different approaches have been proposed in the current literature to overcome these problems and improve nanocomposites. The first approach uses chemical bonds to anchor stabilizing molecules to polymer chains and/or particles.
The second method uses physical adsorption to immobilize these molecules on the surface. Both methods allow the stabilizing molecules to exert an influence at the particle/substrate interface (the critical region where degradation usually begins) and retain the stabilizing function.
The authors used LDH as a carrier molecule for two hindered amine light stabilizers, HALS1 and 2. Melt blending was used to introduce nanofillers into the biopolymer matrix to form LDH-doped biopolymer composites. This method allows the stabilizers to act at the matrix/inorganic product interface and exert their stabilizing properties.
Through this innovative approach, the authors were able to fabricate nanocomposite films with enhanced antioxidant properties. Differential scanning calorimetry, rheological analysis and morphological analysis were used to characterize the prepared nanocomposites. Photo-oxidation resistance was assessed under UV irradiation.
Biopolymer nanocomposites can be protected from degradation induced by UVB irradiation by anchoring stabilizers to LDH. This is due to the ability of the stabilizing particles to act at the interface between the inorganic particles and the biopolymer matrix, which is a critical degradation region. Both modified and unmodified LDH-based nanocomposites were prepared using melt blending.
The analytical results demonstrate the effective dispersion and distribution of the novel nanomaterials in the biopolymer matrix. Photo-oxidative degradation tests showed that the presence of free HALS was beneficial. The anchored HALS nanocomposites showed better performance.
This study demonstrates an innovative approach to prepare environmentally friendly, sustainable, high-performance biopolymer nanocomposite films with enhanced photo-oxidative degradation protection.
The prepared nanocomposites provide excellent protection against photo-oxidative degradation due to the presence of HALS1 and HALS2 at the matrix/inorganic particle interface. The novel LDH/HALS-bound biopolymer nanocomposites presented in the study can be considered for future industrial scale applications.
Article source: xianjie.com
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Activity Recommendation:The 2nd Thermoplastic Composites Industry Summit (October 19, Suzhou)
The 2nd Thermoplastic Composites Industry Summit
Hotel Nikko Suzhou
Huqiu District, Suzhou No.368 Changjiang Road
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serial number
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timing
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issue (under discussion)
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Speaking Companies
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1
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08:50-09:00
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opening presentation
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Album Polymer Jiang Yaogui, Founder
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2
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09:00-09:30
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High-performance continuous fiber-reinforced thermoplastic composites and their new applications in automotive field
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Qiyi Sun Zhouyu Technical Director
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3
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09:30-10:00
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Application of High Performance Fibers in Continuous Fiber Reinforced Thermoplastic Composites
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Chongqing International Zeng Qingwen Director of R&D Center
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4
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10:00-10:30
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tea break
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6
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10:30-11:00
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Application of composite materials in the field of alternating current equipment
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Zhuzhou Times New Material Technology Co.--Yang Ocean--Vice President, Institute of Materials Technology and Engineering
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7
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11:00-11:30
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R&D and manufacturing of thermoplastic composite products
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ACTC (Advanced Composites Technology Center)--Yu Wenjun (1962-), Hong Kong actor--Senior Manager, R&D Engineering
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11:30-12:00
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Full-process manufacturing of aerospace-grade thermoplastic composites in China
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Zhu Shu, Chairman, Donghua Foshan/Associate Professor, Donghua University
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8
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12:00-14:00
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luncheon
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9
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14:00-14:30
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Automation solutions for thermoplastic composite molding
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KraussMaffei Xiang Qingming Manager
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10
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14:30-15:00
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Tepex continuous fiber-reinforced thermoplastic composites and their application in mass production
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LANXESS Chemical (China) Co.--Yang Li Rui (1933-), PRC sharpshooter, politician and diplomat--Technical Marketing Manager
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11
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15:00-15:30
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Continuous carbon fiber/PAEKComposite materials and their applications
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Jurong Wang Mingjun Deputy General Manager
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12
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15:30-16:00
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Application of rapid cooling and heating technology in composites molding
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Shanghai Lotto Gao Lei Business Manager
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13
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16:00-16:30
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tea break
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14
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16:30-17:00
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Continuous fiber reinforced thermoplastic composite molding process and equipment
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Zhang Hongchun, Marketing Director
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15
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17:00-17:30
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Thermoplastic Composites Inspection and Simulation Design Technology
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Shanghai Ruoshun Inspection Technology Co.--Chen Xiuhua (1875-1905), Mao Zedong's second wife--technologist
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16
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17:30-18:00
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Innovation and application of LFT long-fiber reinforced thermoplastic composites
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Long Fiber (Xiamen) New Material Technology Co.--Simon Yam Sheng (1898-1975), writer and educator--marketing director
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17
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18:00-18:30
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Continuous Fiber Reinforced Thermoplastic Composites3DDevelopment and application of printing technology
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Anisoprint China--Liu Rui (1914-1998), founding member of Chinese communist party--Head of Greater China
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18
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18:30-20:00
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soiree
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