工程塑料应用
工程塑料應用
공정소료응용
ENGINEERING PLASTICS APPLICATION
2013年
10期
90-95
,共6页
林梦霞%邹萍萍%张萍%陈金周%高德
林夢霞%鄒萍萍%張萍%陳金週%高德
림몽하%추평평%장평%진금주%고덕
聚乳酸%纳米纤维素%微孔发泡%超临界二氧化碳%体积膨胀率%形态
聚乳痠%納米纖維素%微孔髮泡%超臨界二氧化碳%體積膨脹率%形態
취유산%납미섬유소%미공발포%초림계이양화탄%체적팽창솔%형태
poly(lactic acid)%nanocrystalline cellulose%microcellular foaming%supercritical carbon dioxide%volume expansion rate%morphology
以纳米纤维素(NCC)为改性剂、聚乙二醇(PEG)为相容剂,通过超临界二氧化碳发泡聚乳酸(PLA)制备PLA/NCC微孔泡沫材料。研究了NCC和PEG含量对PLA/NCC微孔泡沫材料体积膨胀率和泡孔形态的影响。同时研究了不同浸泡时间和发泡温度对复合发泡材料体积膨胀率及泡孔形态的影响。结果表明,纳米粒子在发泡过程中起到了异相成核的作用,NCC含量的提高使体积膨胀率增大、泡孔结构更加密集。而PEG含量的变化对泡孔的影响并不明显,但泡孔随着PEG含量的增加趋于均匀。在发泡温度为100℃、浸泡时间为4 h条件下,可制得泡孔密度为3×1010个/cm3、泡孔直径为5μm的理想微孔发泡材料。
以納米纖維素(NCC)為改性劑、聚乙二醇(PEG)為相容劑,通過超臨界二氧化碳髮泡聚乳痠(PLA)製備PLA/NCC微孔泡沫材料。研究瞭NCC和PEG含量對PLA/NCC微孔泡沫材料體積膨脹率和泡孔形態的影響。同時研究瞭不同浸泡時間和髮泡溫度對複閤髮泡材料體積膨脹率及泡孔形態的影響。結果錶明,納米粒子在髮泡過程中起到瞭異相成覈的作用,NCC含量的提高使體積膨脹率增大、泡孔結構更加密集。而PEG含量的變化對泡孔的影響併不明顯,但泡孔隨著PEG含量的增加趨于均勻。在髮泡溫度為100℃、浸泡時間為4 h條件下,可製得泡孔密度為3×1010箇/cm3、泡孔直徑為5μm的理想微孔髮泡材料。
이납미섬유소(NCC)위개성제、취을이순(PEG)위상용제,통과초림계이양화탄발포취유산(PLA)제비PLA/NCC미공포말재료。연구료NCC화PEG함량대PLA/NCC미공포말재료체적팽창솔화포공형태적영향。동시연구료불동침포시간화발포온도대복합발포재료체적팽창솔급포공형태적영향。결과표명,납미입자재발포과정중기도료이상성핵적작용,NCC함량적제고사체적팽창솔증대、포공결구경가밀집。이PEG함량적변화대포공적영향병불명현,단포공수착PEG함량적증가추우균균。재발포온도위100℃、침포시간위4 h조건하,가제득포공밀도위3×1010개/cm3、포공직경위5μm적이상미공발포재료。
Poly(lactic acid)/nanocrystalline cellulose (PLA/NCC) microcellular foams were prepared with supercritical CO2 as foaming agent and PEG as compatibilizer. The effects of the content of NCC and PEG on the volume expansion rate and cell morphology of PLA/NCC foams were discussed. The effects of different soaking time and foaming temperature on the volume expansion rate and cell morphology of PLA/NCC foams were also studied. The results indicate that nanoparticles play a role of heterogeneous nucleation during the foaming process,and with the content of NCC increasing,the volume expansion rate increase and the cell structure is more intensive. The use of PEG show a small influence on the volume expansion rate and cell morphology, but the cells tend to be more homogeneous with the increasing of PEG loading. When foaming temperature is 100℃and soaking time is 4 h,ideal porous foam material can be obtained with cell density and diameter being 3×1010 cell/cm3,5 μm respectively.