土埋条件下生物基锦纶56与锦纶6纤维的老化行为

Aging Behavior of Bio-Based Nylon 56 and Nylon 6 Fiber Under Soil-Buried Conditions

为探究生物基锦纶56与锦纶6纤维在土壤填埋条件下是否会发生老化甚至降解,研究了土壤填埋时间、水分输入量和活性污泥含量对织物性能的影响。结果表明,在室温、不含活性污泥的土壤中填埋老化40周后,生物基锦纶56织物降强率小于15%;在室温、含50%活性污泥和0.5 L/d水分输入量的条件下,生物基锦纶56织物在土埋16周后强力下降约35%,进一步增加土埋时间(到40周)、活性污泥含量和输水量,织物强力不再降低。老化后纤维表面出现明显的刻蚀和凹陷,结晶度增加了3%~6%,表明老化过程主要发生在纤维的无定形区。石油基锦纶6织物在相同实验条件下,强力下降均低于9%,表明生物基锦纶56纤维更容易在土埋条件下发生老化现象。

In order to explore whether bio-based nylon 56 and nylon 6 will age or even degrade under the condition of soil burial,the effects of burial time,water input and activated sludge content on fabric properties were studied.The results show that after 40 weeks of aging in soil without activated sludge at room temperature,the strength reduction of bio-based nylon 56 fabric is less than 15%.Under the conditions of room temperature,50%activated sludge and 0.5 L/d water input,the strength of the bio-based nylon 56 fabric is decreased by about 35%after 16 weeks.With the further increase of buried time,activated sludge content and water input,the fabric strength no longer decreases.After aging,obvious etching appears on the surface of the fibers,the crystallinity is increased by 3%to 6%,indicating that the aging process mainly occurs in amorphous region.Under the same experimental conditions,the strength of petroleum-based nylon 6 fabric decreases less than 9%,indicating that biological-based nylon 56 fabric is more prone to aging under the condition of soil burial.