中文摘要：

以六氟异丙醇（HFIP）为聚甲醛（POM）与聚氧化乙烯（PEO）的共溶剂，通过溶液结晶研究了PEO分子量对POM／PEO50／50晶／晶共混物结晶行为及结晶形态的影响。结果表明，PEO分子量越小，POM与PEO在结晶过程中相互干扰越大。当PEO分子量为4×10^3时，共混物中POM形成部分不完善晶体，出现明显的熔融双峰。SEM结果表明：含不同分子量PEO的共混晶体均无明显相分离，且低分子量PEO的共混物更易形成规整球晶，认为通过溶液结晶，POM／PEO50／50共混物中POM与PEO形成了晶体相互穿插的结晶结构。

英文摘要：

Solution crystallization of polyoxymethylene（POM）/poly（ethylene oxide）（PEO） （50/50） blend with different molecular weight（Mn of PEO, using hexafluoroisopropanol （HF1P） as common solvent, was studied by differential scanning calorimeter（DSC）, scanning electron spectroscopy（SEM） and infrared spectra （IR）. It indicated that the lower Mn of PEO, the stronger interruption between POM and PEO in the crystallization. When/vim of PEO was 4 × 10^3 , POM formed partial imperfect crystals, thus showing obvious double melting peaks in the blend. SEM results showed that no obvious phase separation occurred in the POM/PEO blend with different Mn of PEO and it was easier for the blend with lower Mn of PEO to form regular spherulites. It was expected that the interpenetrated structure was formed in the POM/PEO 50/50 blend through solution crystallization.