CAJ | 학술논문

以两种含有不同功能团的纳米SiO_2对聚左旋乳酸(PLLA)进行了共混改性,从而提高了PLLA的性能.在纳米SiO_2的质量分数为0.5～5%范围内,PLLA与之是相容的,其中含有-NH_2功能团的RNS型纳米对PLLA的T_g有一定的影响,加入质量分数为5%的RNS型纳米SiO_2后,PLLA的T_g降至52℃.由于RNS纳米SiO_2中的-NH_2与PLLA分子链中的-C=O形成了弱的氢键,因此在相同质量分数下,对PLLA热稳定性的影响要高于含-CH_3功能团的DNS纳米SiO_2,质量分数为5%的纳米SiO_2与PLLA共混后,PLLA/RNS纳米SiO_2共混物的热失重起始温度为370℃,而PLLA/RNS纳米SiO_2共混物的则为365℃.
이량충함유불동공능단적납미SiO_2대취좌선유산(PLLA)진행료공혼개성,종이제고료PLLA적성능.재납미SiO_2적질량분수위0.5～5%범위내,PLLA여지시상용적,기중함유-NH_2공능단적RNS형납미대PLLA적T_g유일정적영향,가입질량분수위5%적RNS형납미SiO_2후,PLLA적T_g강지52℃.유우RNS납미SiO_2중적-NH_2여PLLA분자련중적-C=O형성료약적경건,인차재상동질량분수하,대PLLA열은정성적영향요고우함-CH_3공능단적DNS납미SiO_2,질량분수위5%적납미SiO_2여PLLA공혼후,PLLA/RNS납미SiO_2공혼물적열실중기시온도위370℃,이PLLA/RNS납미SiO_2공혼물적칙위365℃.
The thermal stability of Poly(L-lactide)(PLLA)was improved by blending with 2 kinds of nano SiO_2 with-NH_2(RNS)and-CH_3(DNS)functional group.The blending experiments were carried out with the mass fraction of nano SiO_2 from 0.5% to 5%.DSC and FTIR show that 2 kinds of nano SiO_2 were compatible with PLLA in the experimental scale.RNS nano SiO_2 with-NH_2 functional group can decrease the T_g of PLLA.The T_g of PLLA / RNS nano SiO_2 blend was 52℃ when the mass fraction of RNS nano SiO_2 was_5 %.The thermal stability of PLLA / RNS nano SiO_2 blends were higher than that of PLLA / DNS nano SiO_2 blends at the same mass fraction of nano SiO_2.The thermal degradation onset temperature of PLLA / RNS nano SiO_2 blend and PLLA / DNS nano SiO_2 which mass fraction of nano SiO_2 were 5% were 370℃ and 365℃ respectively.