In order to explore the change pattern of molecular weight,oligomer content,and chip processability of biodegrad-able polyester polybutylene succinate(PBS)under industrialized storage conditions,two drying modes of vacuum drying and blast drying,and three storage modes of avoid light and absorb moisture naturally,vacuum sun exposure and vacuum light avoidance were chosen to dry and store the samples for a long period of time,with the PBS chips as the research object.The effects of different drying and storage conditions on the intrinsic viscosity,melt flow,water content and oligomer content of PBS were systematically analyzed.The results show that compared with the vacuum drying,the blast drying method can dry the PBS chips more quickly,and the water content has been reduced to 2.45‰ at 24 h.The decrease of the characteristic viscosity of the samples is small,and the melt flow index do not increase significantly.The content of volatiles within the samples increase with increasing storage time for each storage condition.For viscous average molecular weight molecular weights,the effect of vacuum sun exposure on the molecu-lar weight of the PBS chips is significantly stronger than that of avoid light and absorb moisture naturally.Short-term storage of PBS chips(21 days or less),vacuum light avoidance can better maintain the original molecular weight and melt flow index of PBS,and can effectively reduce the precipitation of oligomers in PBS chips.
NETL
NSTL
万方数据
