聚乳酸（pla）是可降解顆粒生物降解的生物基脂肪族聚酯，衍生自可再生來(lái)源，如馬鈴薯、甘蔗和玉米。pla是透明的可生物降解材料，且有良好的氣體阻隔性能；與羥基脂肪酸酯（pha）、聚乙二醇（peg）等生物材料相比，pla

Polylactic acid (pla) is a biodegradable bio based aliphatic polyester derived from renewable sources, such as potato, sugarcane and corn. Pla is a transparent biodegradable material with good gas barrier property; Compared with biological materials such as hydroxy fatty acid ester (pha) and polyethylene glycol (peg), pla

有更好的熱加工性能，可用多種成型加工方式；pla力學(xué)性能突出，與通用塑料聚苯乙烯（ps）相似；pla對(duì)生物體害作用；使用后在自然環(huán)境中一段時(shí)間內(nèi)經(jīng)微生物作用完全分解生成的二氧化碳和水又可被其原料來(lái)源作物（玉米、土豆等）光合作用過程吸收，維持地球上碳循環(huán)的平衡。

It has better hot working performance and can be processed in various ways; Pla has outstanding mechanical properties, which are similar to polystyrene (ps); Pla has no toxic effect on organisms; After use, the carbon dioxide and water completely decomposed by microorganisms in the natural environment for a period of time can be absorbed by the photosynthesis process of the crops from which the raw materials are derived (corn, potatoes, etc.), maintaining the balance of the carbon cycle on the earth.

因此，pla的開發(fā)符合綠色化學(xué)和工程原理，一方面在工農(nóng)業(yè)、生物醫(yī)學(xué)和包裝等領(lǐng)域有廣闊的應(yīng)用前景，另一方面小化源頭污染和對(duì)人類健康和環(huán)境產(chǎn)生的風(fēng)險(xiǎn)，同時(shí)減緩石油資源的壓力，增強(qiáng)材料的可持續(xù)性。

Therefore, the development of pla conforms to the principles of green chemistry and engineering. on the one hand, it has broad application prospects in the fields of industry, agriculture, biomedicine and packaging, on the other hand, it minimizes the source pollution and risks to human health and the environment, while reducing the pressure on oil resources and enhancing the sustainability of materials.

pla在包裝領(lǐng)域應(yīng)用前景廣闊，但是在室溫下模量高但脆性大的缺陷導(dǎo)致pla制品在使用過程中易發(fā)生斷裂現(xiàn)象，嚴(yán)格阻礙了pla取代傳統(tǒng)聚合物的步伐，因此對(duì)pla進(jìn)行增韌改性成為必然。

Pla has a broad application prospect in the packaging field, but the defects of high modulus but high brittleness at room temperature lead to the fracture phenomenon of pla products in the use process, which strictly hinders the pace of replacing traditional polymers with pla, so it is inevitable to toughen pla.

聚己二酸對(duì)苯二甲酸丁二酯(pbat)是柔韌性良好的脂肪族芳香族共聚酯，具有良好的生物降解性。pbat加工性能優(yōu)良，可進(jìn)行吹制加工和擠出涂覆，常用于增韌改性聚乳酸，以期得到成型加工性能更好柔韌性更佳的pla/pbat全生物降解復(fù)合材料，擴(kuò)展pla在包裝行業(yè)的應(yīng)用。但是pla與pbat兩相僅部分相容，直接將pla與pbat共混，只能在一定程度上提高韌性。

Poly (butylene adipate terephthalate) (pbat) is a flexible aliphatic aromatic copolyester with good biodegradability. Pbat has excellent processability and can be used for blowing processing and extrusion coating. it is often used to toughen and modify polylactic acid in order to obtain pla/pbat biodegradable composites with better molding processing performance and flexibility, and expand the application of pla in the packaging industry. However, the two phases of pla and pbat are only partially compatible. directly blending pla and pbat can only improve the toughness to a certain extent.

此外，pla的偏高也限制了其使用的推廣。因此，可以采用玉米淀粉進(jìn)行填充，但是由于淀粉羥基含量高所以極性高，直接與聚乳酸共混后兩相結(jié)合力低，導(dǎo)致復(fù)合材料強(qiáng)度低。因此，有必要對(duì)現(xiàn)有技術(shù)進(jìn)行改進(jìn)以解決上述技術(shù)問題。更多相關(guān)技術(shù)內(nèi)容就來(lái)我們網(wǎng)站http://www.qylxschool.cn咨詢吧！

In addition, the high price of pla also limits the promotion of its use. Therefore, corn starch can be used for filling, but the polarity of starch is high due to its high hydroxyl content, and the two-phase cohesion is low after directly blending with polylactic acid, resulting in low strength of the composite. Therefore, it is necessary to improve the existing technology to solve the above technical problems. More relevant technical content will come to our website http://www.qylxschool.cn Consult!