The influence of various liquid media (aliphatic alcohols, water-alcohol solutions, saturated hydrocarbons, and organosilicon liquids) on the development of uniaxial deformation and nucleation of crazes in amorphous polylactide (PLA) films has been studied. It has been found that in the presence of the liquids the tensile stress during the polymer deformation decreases by 3–4 times. According to the Griffith's theory, linear dependences (with an accuracy of R² = 0.96–0.97) have been revealed between the yield point or the flow stress of PLA and the square root of product of the elasticity modulus of the polymer in a liquid and the interfacial surface energy at the polymer-liquid medium interface calculated using the Owens-Wendt equation. The data obtained may be used to predict the critical mechanical stress at which crazes will be initiated in PLA.

研究了各种液体介质（脂族醇，水-醇溶液，饱和烃和有机硅液体）对无定形聚丙交酯（PLA）薄膜中蟹的单轴变形和成核发展的影响。已经发现，在存在液体的情况下，聚合物变形期间的拉应力降低了3-4倍。根据格里菲斯（Griffith）的理论，线性相关性（精度为R ² = 0.96-0.97）在PLA的屈服点或流变应力与液体中聚合物的弹性模量与使用Owens计算得出的聚合物-液体介质界面的界面表面能积的平方根之间得到揭示-温特方程式。所获得的数据可用于预测PLA中开始产生裂纹的临界机械应力。