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What is the hydrolytic degradation mechanism of PLA in biodegradable bags?

What is the hydrolytic degradation mechanism of PLA in biodegradable bags?

2021-11-05

What is the hydrolytic degradation mechanism of PLA in biodegradable plastic bags? Let's listen to Dongguan Sengtor Plastic Products Co., Ltd. for your analysis.


The hydrolytic degradation of PLA in degradable plastic bags refers to the reaction of water molecules attacking the ester bond in the polylactic acid molecule to decompose it into carboxylic acid and alcohol, which is the reverse reaction of the esterification reaction. Mainly affected by the temperature, humidity, acidity of the hydrolysis environment, and the nature of the polymer itself.


The hydrolytic degradation of PLA mainly includes four processes: water absorption, ester bond breakage, soluble oligomer diffusion, and fragment dissolution. The hydrolysis of aliphatic polyester starts from the absorption of water. Small molecules of water contact the surface of the sample and diffuse into the surrounding ester bonds or hydrophilic groups. Under the action of acid and alkali in the medium, The ester bond is freely hydrolyzed and broken, and the number average molecular weight of the sample is slowly reduced, and the original mechanical strength is lost. When the molecular weight is as small as the limit value of soluble in water, the overall structure will deform and lose weight, and the product will begin to dissolve and become soluble的degradation products.


Dongguan Sengtor Plastic Products Co., Ltd. is a key high-tech enterprise focusing on R&D, production and sales of biodegradable plastic bags. The company's products are mainly derived from PLA degradable materials, and have passed the biodegradation rate test of the National Plastic Products Quality Supervision and Inspection Center GB/T19277.1 standard, and the European EN13432 standard compost test, which will effectively solve the problem of environmental pollution. Welcome customers to inquire!


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