动态化对超硬化聚乳酸/不和聚乙混合物的形态和生物降解性的影响
Rong Yang1, Chaoyi Cai1, Zhifan Chen1
1Jiangsu Key Laboratory of Environmentally Friendly Polymeric Materials, School of Materials Science and Engineering, Changzhou University, Changzhou 213164, China.
International journal of biological macromolecules
|September 13, 2023
概括
这项研究使用一种新型的共聚合物制造了超强硬,可生物降解的多乳酸 (PLA) 混合物. 由此产生的材料显著增强了PLA.
科学领域:
- 材料科学 材料科学 材料科学
- 聚合物化学 聚合物化学
- 生物材料工程 生物材料工程
背景情况:
- 聚乳酸 (PLA) 是一种具有有限性和抗冲击能力的可生物降解聚合物.
- 开发超坚固而又可生物降解的PLA材料是一个重大的科学挑战.
- 现有的修改往往会损害生物降解性或机械性能.
研究的目的:
- 合成一种可生物降解的多块共聚合物 (PBSFG),以提高PLA的性.
- 调查PLA与PBSFG的动态火山化,以创建超强硬的混合物.
- 优化混合物组成和加工,以提高机械性能和生物降解性.
主要方法:
- 合成不和的多聚乙烯 (PBSFG) 多块共聚合物.
- 用PBSFG对PLA进行动态化,利用PBSFG的自我化.
- 添加二过氧化物 (DCP) 促进动态火山化和提高接口兼容性.
- 机械性质的表征 (破裂时的延长,冲击强度) 和结晶行为.
- 在蛋白酶K溶液中的生物降解性的评估.
主要成果:
- 在动态火山化过程中,PBSFG在PLA矩阵内形成了一个交叉连接的核心-的相.
- 断裂时的延长率从3%增加到66%,Izod冲击强度从3.2到58.0kJ/m2.
- 添加0.03%的DCP进一步增强了破裂时的延伸到218%和冲击强度到88.9kJ/m2.
- 添加PBSFG和DCP加速了PLA结晶,并保持了生物降解性.
- 成功地实现了完全可生物降解和超强硬的PLA混合物.
结论:
- 用自硫化生物降解共聚合物 (PBSFG) 动态化PLA是一种有效的策略,用于制造超强硬材料.
- 添加少量DCP显著提高了PLA/PBSFG混合物的机械性能和兼容性.
- 开发的PLA/PBSFG混合物为需要高性和生物降解性的应用提供了有前途的解决方案.
相关概念视频
Polymer Classification: Architecture
2.8K
Polymers are classified as linear or branched on the basis of their chain architecture. The polymer chains in linear polymers have a long chain-like structure with minimal to no branching at all. Even if a polymer features large substituent groups on the monomer, which appear as branches to the skeleton, it is not considered a branched polymer. A branched polymer contains secondary polymer chains that arise from the main polymer chain. The branching occurs when the polymer growth shifts from...
2.8K
Types of Step-Growth Polymers: Polyesters
2.3K
The introduction of polyesters has brought major development to the textile industry. The wrinkle-free behavior of polyester blends has eliminated the need for starching and ironing clothes.
Polyesters are commonly prepared from terephthalic acid and ethylene glycol; the crude product is known as poly(ethylene terephthalate) or PET. However, polyesters are synthesized industrially by transesterification of dimethyl terephthalate with ethylene glycol at 150 °C. The two reactants and the...
Polyesters are commonly prepared from terephthalic acid and ethylene glycol; the crude product is known as poly(ethylene terephthalate) or PET. However, polyesters are synthesized industrially by transesterification of dimethyl terephthalate with ethylene glycol at 150 °C. The two reactants and the...
2.3K
Polymer Classification: Stereospecificity
2.5K
Polymerization generates chiral centers along the entire backbone of a polymer chain. Accordingly, the stereochemistry of the substituent group has a significant effect on polymer properties. Polymers formed from monosubstituted alkene monomers feature chiral carbons at every alternate position in the polymer backbone. Relative to the predominant orientation of substituents at the adjacent chiral carbons, the polymer can exist in three different configurations: isotactic, syndiotactic, and...
2.5K
Superplasticizers
103
Superplasticizers are advanced admixtures that enhance the workability of concrete by lowering the water content without compromising the strength of the material. These substances are highly effective water reducers, improving concrete flow, making it easier to work with, and enabling concrete to reach inaccessible areas or densely reinforced sections without mechanical vibration. The key components in superplasticizers are either sulfonated melamine or naphthalene formaldehyde condensates,...
103
Plastic Behavior
219
A material's elastic behavior is characterized by the disappearance of stress once the load is removed, allowing the material to return to its original state. However, when stress surpasses the yield point, yielding commences, marking the onset of plastic deformation or permanent set. This change from elastic to plastic behavior is influenced by the peak stress value and the duration before the load is removed. An intriguing observation occurs when a specimen is loaded, unloaded, and...
219
Polymer Classification: Crystallinity
2.9K
Unlike ionic or small covalent molecules, polymers do not form crystalline solids due to the diffusion limitations of their long-chain structures. However, polymers contain microscopic crystalline domains separated by amorphous domains.
Crystalline domains are the regions where polymer chains are aligned in an orderly manner and held together in proximity by intermolecular forces. For example, chains in the crystalline domains of polyethylene and nylon are bound together by van der Waals...
Crystalline domains are the regions where polymer chains are aligned in an orderly manner and held together in proximity by intermolecular forces. For example, chains in the crystalline domains of polyethylene and nylon are bound together by van der Waals...
2.9K


