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相关概念视频

Plasticizers01:31

Plasticizers

91
Water-reducers, or plasticizers, are chemical admixtures used in concrete to improve strength and workability. These additives reduce the water-cement ratio without compromising workability, lower the cement content while maintaining the same workability, or increase workability to assist concrete placement in inaccessible areas.
Plasticizers function by using surface-active agents to create repulsive electrostatic forces between cement particles. This dispersion enhances the concrete's...
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Superplasticizers01:30

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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,...
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Cellulose and Pectic Polysaccharides01:15

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 Every plant cell has a cell wall that protects the cell, provides structural support, and gives the cell shape. Cellulose, the main structural component of the plant cell wall, makes up over 30% of plant matter. It is the most abundant organic compound on earth.  Cellulose is an unbranched polysaccharide composed of linear chains of glucose molecules linked by β (1→4) glycosidic bonds.
As a cell matures, its cell wall specializes according to its type. For example, the...
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Plastic Behavior01:21

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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...
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Types of Step-Growth Polymers: Polyesters01:20

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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.
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Polymers02:34

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The word polymer is derived from the Greek words “poly” which means “many” and “mer” which means “parts”. Polymers are long chains of molecules composed of repeating units of smaller molecules, known as monomers. They either occur naturally, such as DNA and proteins, or can be constructed synthetically, like plastics. They have varied structural characteristics, such as linear chains, branched chains, or complex networks, that contribute to the...
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Updated: Jul 23, 2025

The Effect of Construction and Demolition Waste Plastic Fractions on Wood-Polymer Composite Properties
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克西兰塑料的塑料

Siyu Jia1, Ziwen Lv1, Jun Rao1

  • 1Beijing Key Laboratory of Lignocellulosic Chemistry, Beijing Forestry University, Beijing 100083, China.

ACS nano
|July 13, 2023
PubMed
概括
此摘要是机器生成的。

研究人员使用双重交叉连接开发了一种新型的生物降解塑料,这种塑料来自于西兰. 这种高性能西兰塑料 (XP) 提供了增强的机械性能,形状重编程性和生物降解性,解决了塑料污染问题.

关键词:
可生物降解性 生物降解性双重交叉连接 双重交叉连接高强度的性 高强度的性塑料的塑料塑料的塑料塑料的塑料的塑料克西兰 (Xylan) 是一个词.

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Sequencing of Plant Wall Heteroxylans Using Enzymic, Chemical Methylation and Physical Mass Spectrometry, Nuclear Magnetic Resonance Techniques
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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
  • 环境科学 环境科学

背景情况:

  • 越来越多的塑料垃圾给环境带来了重大挑战.
  • 可生物降解塑料提供了一个潜在的解决方案,但面临着科学障碍.
  • 从工业废物中提取的西兰被探索为可持续的塑料前体.

研究的目的:

  • 开发一种高性能,生物可降解的塑料,由西兰制成.
  • 为了提高基兰基材料的机械性能和可加工性.
  • 创造一种可持续的塑料替代品,具有大规模生产潜力.

主要方法:

  • 通过双重交联策略 (乙化和热压) 制造西兰塑料 (XP).
  • 机械性能 (抗拉强度,性,模量) 和热性能 (DMA) 的表征.
  • 对形状重编程性,光学性能,细胞毒性和生物降解性的评估.

主要成果:

  • XP表现出显著增强的性和机械强度 (55 MPa的抗拉强度,2.2 MJ/m3的性,1.7 GPa的模量).
  • 该材料表现出热可塑性,通过水分子相互作用使热成型和重复的形状重编程成为可能.
  • XP在60天内显示出出色的无毒性和生物降解性,具有低热膨胀和良好的光学性能.

结论:

  • 通过双重交联方法,成功生产了高性能,可生物降解的西兰塑料 (XP).
  • XP为传统塑料提供了一个可调节,可重编程的形状和环保的替代品.
  • 这种方法为从工业废物中可扩展生产可持续塑料提供了可行的途径.