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采用固相接枝法制备低密度聚乙烯(LDPE)接枝马来酸酐(MAH),并利用FT-IR表征了接枝产物的化学结构。研究了反应温度、引发剂用量、单体用量、界面剂用量以及反应时间对产物接枝率和交联度的影响。同时考察了接枝产物(LDPE-g-MAH)对聚酰胺66/低密度聚乙烯(PA66/LDPE)共混物的力学性能和形态的影响。结果表明,MAH已成功接枝到了LDPE上;适当提高反应温度、加大引发剂与MAH用量有利于产物接枝率的提高,但温度过高、引发剂用量过大会导致产物交联;界面剂的加入不仅能够提高接枝率,还能有效抑制产物交联;LDPE-g-MAH引入能明显提高PA66/LDPE的冲击强度与拉伸强度,有效改善共混物的相容性。
Low density polyethylene (LDPE) grafted maleic anhydride (MAH) was prepared by solid phase grafting. The chemical structure of the grafted product was characterized by FT-IR. The effects of reaction temperature, initiator amount, monomer amount, interface agent dosage and reaction time on grafting degree and cross-linking degree of the product were studied. The effects of grafted product (LDPE-g-MAH) on the mechanical properties and morphology of polyamide 66 / low density polyethylene (PA66 / LDPE) blends were also investigated. The results showed that MAH has been successfully grafted onto LDPE. Appropriately increasing the reaction temperature and increasing the amount of initiator and MAH are conducive to the grafting rate of the product. However, when the temperature is too high, The addition of LDPE-g-MAH can significantly improve the impact strength and tensile strength of PA66 / LDPE and effectively improve the compatibility of the blends.