可生物降解材料的膜性作用

The performance of degradable membrane is optimized to improve the performance of degradable membrane. In the process of membrane preparation, it is usually necessary to modify the raw materials. At present, there are three main methods to optimize the performance of degradable membrane:

1、物理法 包括超声改性、高压改性和共混改性等。 超声改性：通过超声波的机械力、空化作用和热效应改变可降解膜化学键结构使膜的物理、化学性质发生变化。 高压改性：通过高压的机械力使膜结构密实度变化，改变了膜的形貌、空间结构，从而引起孔径、力学性能等变化。 共混改性：加入不同组分共混，通过不同组分功能基团间的分子间氢键、离子键以及分子链缠结等作用，使膜功能性、力学性能、稳定性等改变。

1. Physical methods include ultrasonic modification, high-pressure modification and blending modification. Ultrasonic modification: the physical and chemical properties of the degradable membrane are changed by changing the chemical bond structure of the degradable membrane through the mechanical force, cavitation and thermal effect of ultrasonic. High pressure modification: the mechanical force of high pressure changes the compactness of the membrane structure, changes the morphology and spatial structure of the membrane, resulting in changes in pore size and mechanical properties. Blending modification: adding different components to blend, through intermolecular hydrogen bonds, ionic bonds and molecular chain entanglement between functional groups of different components, the membrane functionality, mechanical properties, stability and other changes.

2、化学法 包括酸/碱改性、接枝改性和交联改性等。 酸改性：在膜制备过程中加入酸，经酸化影响成膜组分的官能团、键能和化学键结构，改变膜的化学性质，影响其性能。 碱改性：在膜制备过程中加入碱，成膜组分发生水解、醚化等反应导致膜中官能团和聚合物链的连接改变，使膜性能发生变化。 接枝改性：通过不同聚合物间接枝共聚反应改变单一聚合物官能团类型、键能、聚合物链的空间结构等，进而影响膜功能性、结晶度、透气性、力学性能等。 交联改性：通过加入交联剂使官能团之间发生交联反应，原来的线型或轻度支链型大分子形成三维网状结构，束缚分子链的运动，导致膜微观结构、功能基团改变。

2. Chemical methods include acid/alkali modification, grafting modification and crosslinking modification. Acid modification: acid is added in the process of membrane preparation. After acidification, the functional group, bond energy and chemical bond structure of the film-forming components are affected, and the chemical properties of the membrane are changed, affecting its performance. Alkali modification: alkali is added in the process of membrane preparation, and the hydrolysis, etherification and other reactions of film-forming components lead to changes in the connection of functional groups and polymer chains in the membrane, which changes the performance of the membrane. Graft modification: through the indirect branch copolymerization of different polymers, the functional group type, bond energy, and the spatial structure of the polymer chain of a single polymer can be changed, thus affecting the membrane functionality, crystallinity, permeability, mechanical properties, etc. Crosslinking modification: cross-linking reaction between functional groups occurs by adding cross-linking agent, and the original linear or slightly branched macromolecules form three-dimensional network structure, binding the movement of molecular chains, resulting in changes in membrane microstructure and functional groups.

3、生物法 主要是以生物酶改性为主。 在生物酶作用下促进新键生成，改变材料分子间键能、分子链结构、反应强度等，影响膜微观结构与性能

3. Biological method is mainly based on biological enzyme modification. Promote the formation of new bonds under the action of biological enzymes, change the intermolecular bond energy, molecular chain structure, reaction strength, etc. of materials, and affect the microstructure and performance of membranes

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