研究了聚甲醛生产过程中的反应温度、引发剂三氟化硼用量、反应物配合比、反应物二氧五环添加方式及聚合方式等对聚甲醛不稳定末端基(HO)的影响,研究结果表明,在反应温度为89℃,引发剂用量为50×10-6,采用引发剂与二氧五环单体先期聚合条件下,不稳定末端基含量最低,为0.86%,此时聚甲醛的热稳定性最好,初始热分解温度为314℃,二氧五环的加入,能够有效地提高聚甲醛分子链的热稳定性,减少不稳定末端基,聚甲醛不稳定末端基对聚甲醛的热分解温度具有较大影响,随着不稳定末端基的升高,聚甲醛的热分解温度随之降低,热稳定性下降;经过对反应条件研究优化后,聚甲醛的热分解温度比原先提高了25℃。
[1] Celik F E,Kim T J,Bell A T.Effect of zeolite framework type and Si/Al ratio on dimethoxymethane carbonylation[J].Journal of Catalysis,2010,270(1):185-195.
[2] Burger J,Siegert M,Strofer E,et al.Poly(oxymethylene) dimethyl ethers as components of tailored diesel fuel:properties,synthesis and purification concepts[J].Fuel,2010,89(11):3315-3319.
[3] 邓立伟,聚甲醛生产中的挥发分脱除[J].合成树脂及塑料,2017,34(1):52-55.
[4] 申宏鹏,孟永智,方伟,等,煤基共聚甲醛增韧改性研究[J].工程塑料应用,2013,41(11):35-38.
[5] 李朝艳.煤矸石增韧聚甲醛树脂的研究[J].天然气化工,2014,39(6):21-24.
[6] 卢波,邹光继,季君晖,等.聚甲醛/水镁石纤维复合材料的制备与表征[J].合成树脂及塑料,2015,32(5):32-35.
[7] 曲敏杰,张金东,马春,等,聚氨酯/纳米二氧化硅/POM复合材料的研究[J].塑料工业,2011,39(4):58-61.
[8] 龙春光,吴茵,华熳煜.聚甲醛多元复合材料的力学性能和承载能力[J].功能材料,2005,36(5):684-686.
[9] 凌绳,王秀芳,吴友平.聚合物材料[M].北京:化学工业出版社,2010.
[10] 蔡菁菁,张明非,蔡绪福.弹性体和刚性粒子对聚甲醛的增韧改性研究[J].中国塑料,2012,26(8):26-30.
[11] 卢波,邹光继,季君晖,等.聚甲醛/水镁石纤维复合材料的制备与表征[J].合成树脂及塑料,2015,32(5):32-35.
[12] Echhard S,Hans H,Sergej B.Method for producing polyoxymethylene dimethyl ethers from methanol and formaldehyde:US,7671240[P].2010-03-02.
[13] 吴保章,王彦辉,李豪,等.膨胀蛭石填充聚甲醛复合材料的制备与性能[J].化学研究,2017,28(2):236-240.
[14] Burger J,Strofer E,Hasse H.Chemical equilibrium and reaction kinetics of the heterogeneously catalyzed formation of poly(oxymethylene) dimethyl ethers from methylal and trioxane[J].Industrial & Engineering Chemistry Research,2012,51(39):12751-12761.
[15] 杨大志,贾伟艺,马小丰,等.二异氰酸酯增容POM/TPU共混体系的研究[J].塑料科技,2014,42(5):114-117.
[16] 汪晓东,张强,崔秀国.离聚体增韧聚甲醛体系的力学性能与亚微相态研究[J].高分子材料科学与工程,2003,19(5):97-100.
[17] Uthaman R N,Pandurangan A,Majeed S S M A.Blends of polyacetal and ethylene-octene elastomer:mechanical,dynamic mechanical and morphological properties[J].Journal of Polymer Research,2007,14(6):441-447.
[18] Ignatova M.Synthesis of copolymer brushes endowed with adhesion to stainless steel surfaces and antibacterial properties by controlled nitroxide-mediated radical polymerization[J].Langmuir,2004,20(24):10718-10726.
[19] 龙春光,吴茵,华熳煜.聚甲醛多元复合材料的力学性能和承载能力[J].功能材料,2005,36(5):684-686.
[20] 王亮亮,陈科宇,商亚东,等,成核剂对聚甲醛结构与性能的影响[J].工程塑料应用,2013,41(6):84-87.
PDF
(1331KB)
