CAJ | 학술논문

以改性碱木质素与聚乙烯醇( PVA)为原料,甲醛为交联剂,采用无机发泡原理,制备了聚乙烯醇/碱木质素发泡材料( PLFM)、聚乙烯醇/环氧化碱木质素发泡材料( PELFM)和聚乙烯醇/羟甲基化碱木质素发泡材料( PHLFM),并利用红外光谱、扫描电镜、DSC及TG对发泡材料进行了测定及分析。结果表明, PVA用量为5 g时,环氧化碱木质素用量为50%(以 PVA 质量计,下同),甲醛用量24%,硫酸用量54%,固化温度120℃制备的 PELFM 拉伸强度最大,为17.26 MPa。 FT-IR分析显示, PLFM和PHLFM的苯环5位均发生取代,而PELFM没有发生取代；SEM图片显示发泡材料的孔径不规则,孔隙率较大；与另两种发泡材料相比,PELFM拉伸性能低,表观密度较低,吸水倍率也较低。从DSC和TG分析可知,3种发泡材料中PELFM具有较低的玻璃态转变温度,但其生物相容性最好,PELFM失重率最高峰对应的峰值温度最大且介于碱木质素与PVA之间,烧失后残余量也最大,表明PELFM的耐热性更好,热稳定性更强。
이개성감목질소여취을희순( PVA)위원료,갑철위교련제,채용무궤발포원리,제비료취을희순/감목질소발포재료( PLFM)、취을희순/배양화감목질소발포재료( PELFM)화취을희순/간갑기화감목질소발포재료( PHLFM),병이용홍외광보、소묘전경、DSC급TG대발포재료진행료측정급분석。결과표명, PVA용량위5 g시,배양화감목질소용량위50%(이 PVA 질량계,하동),갑철용량24%,류산용량54%,고화온도120℃제비적 PELFM 랍신강도최대,위17.26 MPa。 FT-IR분석현시, PLFM화PHLFM적분배5위균발생취대,이PELFM몰유발생취대；SEM도편현시발포재료적공경불규칙,공극솔교대；여령량충발포재료상비,PELFM랍신성능저,표관밀도교저,흡수배솔야교저。종DSC화TG분석가지,3충발포재료중PELFM구유교저적파리태전변온도,단기생물상용성최호,PELFM실중솔최고봉대응적봉치온도최대차개우감목질소여PVA지간,소실후잔여량야최대,표명PELFM적내열성경호,열은정성경강。
By using inorganic foaming principles,polyvinyl alcohol/alkali lignin foaming material(PLFM),polyvinyl alcohol/epoxided alkali lignin foaming material ( PELFM ) , and polyvinyl alcohol/hydroxymethylated alkali lignin foaming material ( PHLFM ) , were prepared,with polyvinyl alcohol and modified alkali lignin as raw materials and formaldehyde as crosslinking agent. Then they were determined and analyzed by FT-IR,scanning electron microscope,DSC,and TG. The results showed that when PVA was 5g and the addition of epoxided alkali lignin was 50% of the PVA’ s mass,formaldehyde 24%,sulfuric acid 54%,and 120℃ for solidification, the obtained PELFM had the maximum tensile strength,17. 26 MPa. FT-IR results showed that substitutions were occurred on the benzene rings of PLFM and PHLFM at the 5-position,but PELFM not. SEM maps showed that the pore sizes were irregular and the porosity was large. Compared with others, PELFM possessed lower tensile property, apparent density, and water absorbency. From DSC and TG analysis,PELFM had the lowest glass transition temperature,the best biological compatibility,the maximum residual quantity and the maximum temperature corresponding to the highest lose rate peak. This temperature which was between the relevant temperatures of alkali lignin and PVA. It indicated that PELFM had the best heat resistance and thermal stability.