CAJ | 학술논문

研究了线型低密度聚乙烯(PE–LLD)／超高分子量聚乙烯(PE–UHMW)共混物的超临界CO2微孔发泡行为，探讨了PE–UHMW含量、发泡温度和饱和压力对泡孔形貌的影响。采用差示扫描量热仪和旋转流变仪对PE–LLD及其共混物的热性质和流变性质进行了测试和表征，并通过扫描电子显微镜表征和分析了发泡样品的泡孔形貌。结果表明，少量PE–UHMW的加入可以显著降低PE–LLD发泡样品的孔径，增加孔密度。随着发泡温度的升高， PE–LLD样品的泡孔结构会发生塌陷现象，而加入少量PE–UHMW可以提高基体的黏度，起到支撑孔壁防止塌陷的作用，并最终得到均匀的开孔结构。另一方面，当温度一定时，饱和压力升高可以降低孔径并且得到开孔形貌的泡孔结构。
연구료선형저밀도취을희(PE–LLD)／초고분자량취을희(PE–UHMW)공혼물적초림계CO2미공발포행위，탐토료PE–UHMW함량、발포온도화포화압력대포공형모적영향。채용차시소묘량열의화선전류변의대PE–LLD급기공혼물적열성질화류변성질진행료측시화표정，병통과소묘전자현미경표정화분석료발포양품적포공형모。결과표명，소량PE–UHMW적가입가이현저강저PE–LLD발포양품적공경，증가공밀도。수착발포온도적승고， PE–LLD양품적포공결구회발생탑함현상，이가입소량PE–UHMW가이제고기체적점도，기도지탱공벽방지탑함적작용，병최종득도균균적개공결구。령일방면，당온도일정시，포화압력승고가이강저공경병차득도개공형모적포공결구。
Microcellular foaming of PE–LLD/PE–UHMW blend was studied by using supercritical carbon dioxide. The influence of the content of PE–UHMW,foaming temperature and saturation pressure on cell morphologies was investigated. Firstly, the thermal properties and rheology behavior were studied. Thereafter,SEM was employed to analyze the cell morphologies. The results shows that the addition of small content of PE–UHMW results in the decrease of cell size and increase of cell density. With the increase of foaming temperature,the cell collapse collapses in PE–LLD foams. The viscosity of blend increases with the addition of PE–UHMW,which prevents the cell collapse,and finally leads to the uniform open-cell morphology. On the other hand,for the same foaming temperature,the increase of saturation pressure may reduce the cell size and result in the open-cell morphology.