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 包括超聲改性、高壓改性和共混改性等。 超聲改性：通過(guò)超聲波的機(jī)械力、空化作用和熱效應(yīng)改變可降解膜化學(xué)鍵結(jié)構(gòu)使膜的物理、化學(xué)性質(zhì)發(fā)生變化。 高壓改性：通過(guò)高壓的機(jī)械力使膜結(jié)構(gòu)密實(shí)度變化，改變了膜的形貌、空間結(jié)構(gòu)，從而引起孔徑、力學(xué)性能等變化。 共混改性：加入不同組分共混，通過(guò)不同組分功能基團(tuán)間的分子間氫鍵、離子鍵以及分子鏈纏結(jié)等作用，使膜功能性、力學(xué)性能、穩(wěn)定性等改變。

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、化學(xué)法 包括酸/堿改性、接枝改性和交聯(lián)改性等。 酸改性：在膜制備過(guò)程中加入酸，經(jīng)酸化影響成膜組分的官能團(tuán)、鍵能和化學(xué)鍵結(jié)構(gòu)，改變膜的化學(xué)性質(zhì)，影響其性能。 堿改性：在膜制備過(guò)程中加入堿，成膜組分發(fā)生水解、醚化等反應(yīng)導(dǎo)致膜中官能團(tuán)和聚合物鏈的連接改變，使膜性能發(fā)生變化。 接枝改性：通過(guò)不同聚合物間接枝共聚反應(yīng)改變單一聚合物官能團(tuán)類(lèi)型、鍵能、聚合物鏈的空間結(jié)構(gòu)等，進(jìn)而影響膜功能性、結(jié)晶度、透氣性、力學(xué)性能等。 交聯(lián)改性：通過(guò)加入交聯(lián)劑使官能團(tuán)之間發(fā)生交聯(lián)反應(yīng)，原來(lái)的線型或輕度支鏈型大分子形成三維網(wǎng)狀結(jié)構(gòu)，束縛分子鏈的運(yùn)動(dòng)，導(dǎo)致膜微觀結(jié)構(gòu)、功能基團(tuán)改變。

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為主。 在生物酶作用下促進(jìn)新鍵生成，改變材料分子間鍵能、分子鏈結(jié)構(gòu)、反應(yīng)強(qiáng)度等，影響膜微觀結(jié)構(gòu)與性能

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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