Preparation and effect of nano CoFe2O4 on crystallization performance of PLA

doi:10.19491/j.issn.1001-9278.2022.01.002

Abstract

Abstract:

To realize the functionalization of PLA， the crystallization behavior of the modified PLA was investigated intensively. CoFe₂O₄ nanoparticles coated with oleic acid were first prepared using a chemical co?precipitation method， and then the PLA/CoFe₂O₄ composites were prepared using a solution casting method. The composition and structure of CoFe₂O₄ particles and the composites were investigated using Fourier transform infrared spectroscopy（FTIR）， transmission electron microscope（TEM）， and X?ray diffractometer （XRD）， and the crystallization behavior of the composites were analyzed using XRD， differential scanning calorimeter（DSC） and polarizing microscope（PLM）. The results indicated that the CoFe₂O₄ particles （10~20 nm） were uniformly dispersed in PLA without obvious agglomeration. A small amount （≤1.5 %） of CoFe₂O₄ particles could generate a significant heterogeneous nucleation effect on the crystallinity of PLA， promoting its crystallization and improving its crystallinity. With a maximum increase of 207 %， the excessive CoFe₂O₄ particle content generated a hindering effect on the crystallization of PLA.

Key words: polylactic acid, oil soluble, CoFe₂O₄, composite, crystallization

CLC Number:

TQ321

MAO Chen, LIU Fan, E Yi, ZOU Shuyan, GONG Xinghou. Preparation and effect of nano CoFe₂O₄ on crystallization performance of PLA[J]. China Plastics, 2022, 36(1): 9-14.

Figures/Tables 7

Fig.1. FTIR of CoFe2O4 particles before and after coating with oleic acid

Fig.2. FTIR of PLA and PLA/CoFe2O4 composite

Fig.3. TEM of PLA/CoFe2O4 composites

Fig.4. XRD of CoFe2O4， PLA and PLA/CoFe2O4 composites

Fig.5. DSC heating curves of pure PLA and PLA/CoFe2O4 composites

样品	$T g$ /℃	$X m c$ /%	$T c c$ /℃	$? H c c$ /J·g^-1	$T m$ /℃	$? H m$ /J·g^-1	$X c$ /%
PLA	59.7	7.3	134.5	5.8	168.1	12.6	13.1
PLA/05CoFe₂O₄	59.5	12.2	130.8	21.8	166.7	33.1	34.5
PLA/1CoFe₂O₄	59.3	16.3	126.8	21.5	167.4	36.5	38.3
PLA/15CoFe₂O₄	59.1	16.8	123.9	22.7	167.2	38.1	40.2
PLA/2CoFe₂O₄	59.8	13.5	122.0	18.5	166.5、170.6	31.2	33.1
PLA/3CoFe₂O₄	59.6	12.6	118.2	15.4	164.7、168.7	26.8	28.7
PLA/4CoFe₂O₄	59.5	10.9	116.3	14.8	164.8、169.7	24.6	26.6
PLA/6CoFe₂O₄	59.7	10.5	113.1	14.2	164.2、169.4	23.5	26.0
PLA/8CoFe₂O₄	59.7	9.8	111.2	13.9	164.5、169.7	22.3	25.2

样品	$T g$ /℃	$X m c$ /%	$T c c$ /℃	$? H c c$ /J·g^-1	$T m$ /℃	$? H m$ /J·g^-1	$X c$ /%
PLA	59.7	7.3	134.5	5.8	168.1	12.6	13.1
PLA/05CoFe₂O₄	59.5	12.2	130.8	21.8	166.7	33.1	34.5
PLA/1CoFe₂O₄	59.3	16.3	126.8	21.5	167.4	36.5	38.3
PLA/15CoFe₂O₄	59.1	16.8	123.9	22.7	167.2	38.1	40.2
PLA/2CoFe₂O₄	59.8	13.5	122.0	18.5	166.5、170.6	31.2	33.1
PLA/3CoFe₂O₄	59.6	12.6	118.2	15.4	164.7、168.7	26.8	28.7
PLA/4CoFe₂O₄	59.5	10.9	116.3	14.8	164.8、169.7	24.6	26.6
PLA/6CoFe₂O₄	59.7	10.5	113.1	14.2	164.2、169.4	23.5	26.0
PLA/8CoFe₂O₄	59.7	9.8	111.2	13.9	164.5、169.7	22.3	25.2

Tab.1. DSC cooling and secondary heating thermal transition data of pure PLA and PLA/CoFe2O4 composites

Fig.6. PLM of PLA and PLA/CoFe2O4 composites crystallized at 130 ℃

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Preparation and effect of nano CoFe₂O₄ on crystallization performance of PLA

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