Abstract: Polyoxymethylene (POM) with lower volatile matters is prepared and the effects of the mass content of initiator,the ratio of raw materials and reaction temperature on low molecular formaldehyde in prepared POM are investigated.It is shown that the content of low molecular formaldehyde in prepared POM can reach the minimum when reaction temperature is set at 89℃ and the content of initiator is 50 μg·g-1.Meanwhile,the pre-polymerization between initiator and dioxolane can reduce effectively the content of low molecular formaldehyde in prepared POM and enhance the decomposition temperature of POM.Through these improvements,POM performance improves significantly,and the tensile strength,notched impact strength and flexural strength of samples are 61.3 MPa,90.3 MPa and 6.71 MPa respectively.The content of low molecular formaldehyde is as low as 78 μg·g-1,which can meet the requirements from the automotive and other industries.It is found that the type and dosage amount of blocking agent has a great impact on the content of low molecular formaldehyde in POM.The active center and the unstable terminal group are completely passivated when the dosage amount of blocking agent is 1 300 μg·g-1.
胡朝辉, 张广发, 李武斌, 杨艳兵, 乔方方, 韩元培. 低挥发份聚甲醛的制备及其性能研究[J]. 现代化工, 2019, 39(1): 154-157.
HU Zhao-hui, ZHANG Guang-fa, LI Wu-bin, YANG Yan-bing, QIAO Fang-fang, HAN Yuan-pei. Preparation and properties of POM with lower volatile matters. Modern Chemical Industry, 2019, 39(1): 154-157.
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