Modification of Polylactic Acid by Reactive Blending with Functionalized Imidazolium-based Ionomers and Epoxy-containing Additives

doi:10.19894/j.issn.1000-0518.220055

Chinese Journal of Applied Chemistry ›› 2022, Vol. 39 ›› Issue (12): 1870-1879.DOI: 10.19894/j.issn.1000-0518.220055

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Modification of Polylactic Acid by Reactive Blending with Functionalized Imidazolium-based Ionomers and Epoxy-containing Additives

Yi-Lian MA¹, Hao-Dong HU¹, Ying-Li DING², Xiang-Jian CHEN², Liang CUI³(), Kun-Yu ZHANG³()

^1.School of Chemical Engineering and Technology，Tianjin University，Tianjin 300350，China
^2.Tianjin Key Laboratory of Composite and Functional Materials，School of Materials Science and Engineering，Tianjin University，Tianjin 300350，China
^3.Advanced Materials Research Center，Petrochemical Research Institute，Petro China Company Limited，Beijing 102206，China

Received:2022-03-03 Accepted:2022-07-25 Published:2022-12-01 Online:2022-12-13
Contact: Liang CUI,Kun-Yu ZHANG
About author:cuiliang@petrochina.com.cn
kyzhang@tju.edu.cn
Supported by:
the National Natural Science Foundation of China(51573130)

Abstract

Abstract:

Aiming to tackle the serious brittleness problem of polylactic acid （PLA）， PLA-based multiphase blends are prepared by melting reactive blending with hydroxyl functionalized ionomer as the toughening agent and compatibilizer containing epoxy groups. The structures and properties of the blends are characterized by scanning electron microscopy （SEM）， Fourier transform infrared spectrometer （FT-IR）， differential scanning calorimetry （DSC） and mechanical properties tests. The synergistic compatibilization and toughening effects of epoxy soybean oil （ESO）， polyethylene glycol diglycidyl ether （PEGDE） and ethylene-methyl acrylate-glycidyl methacrylate （AX8900） terpolymer are compared and analyzed. The results show that the compatibilization effect is closely related to the content and position of the epoxy group in the additives， which presenting different toughening effects. The addition of AX8900 can effectively improve the toughness of the blend system to obtain balanced mechanical properties. However， ESO tends to lead to crosslinking， which limits the toughening efficiency. PEGDE mainly shows a plasticizing effect， leading to the reduction of tensile strength. The results demonstrate modification of the PLA blends by reactive blending with different epoxy additives and hydroxy-containing polymers is an effective strategy for the development of high-performance biobased PLA materials.

Key words: Polylactide, Reactive blending, Toughening, Ionomer

CLC Number:

O631

Yi-Lian MA, Hao-Dong HU, Ying-Li DING, Xiang-Jian CHEN, Liang CUI, Kun-Yu ZHANG. Modification of Polylactic Acid by Reactive Blending with Functionalized Imidazolium-based Ionomers and Epoxy-containing Additives[J]. Chinese Journal of Applied Chemistry, 2022, 39(12): 1870-1879.

Figures/Tables 8

Fig.1 The structures of ESO， PEGDE and AX8900

Table 1 Blend compositions and the corresponding codes

样品 Sample	质量比 Mass ratio
PLA/ECO-OH-PF₆	m（PLA）/m（ECO-OH-PF₆）=90/10
PLA/ECO-OH-PF₆	m（PLA）/m（ECO-OH-PF₆）=80/20
PLA/ECO-OH-PF₆	m（PLA）/m（ECO-OH-PF₆）=70/30
PLA/ESO/ECO-OH-PF₆	m（PLA）/m（ESO）/m（ECO-OH-PF₆）=80/5/20
PLA/ESO/ECO-OH-PF₆	m（PLA）/m（ESO）/m（ECO-OH-PF₆）=80/10/20
PLA/ESO/ECO-OH-PF₆	m（PLA）/m（ESO）/m（ECO-OH-PF₆）=80/15/20
PLA/AX8900/ECO-OH-PF₆	m（PLA）/m（AX8900）/m（ECO-OH-PF₆）=80/5/20
PLA/AX8900/ECO-OH-PF₆	m（PLA）/m（AX8900）/m（ECO-OH-PF₆）=80/10/20
PLA/AX8900/ECO-OH-PF₆	m（PLA）/m（AX8900）/m（ECO-OH-PF₆）=80/15/20
PLA/PEGDE/ECO-OH-PF₆	m（PLA）/m（PEGDE）/m（ECO-OH-PF₆）=80/5/20
PLA/PEGDE/ECO-OH-PF₆	m（PLA）/m（PEGDE）/m（ECO-OH-PF₆）=80/10/20
PLA/PEGDE/ECO-OH-PF₆	m（PLA）/m（PEGDE）/m（ECO-OH-PF₆）=80/15/20

Fig.2 SEM images for cryo-fractured surfaces of the ternary blends

Fig.3 FT-IR spectra and partial enlarged of the blending samples：（A，A'，A"） the blends PLA/AX8900/ECO-OH-PF6；（B，B'，B"） the blends of PLA/ESO/ECO-OH-PF6；（C，C'，C"） the blends of PLA/PEGDE/ECO-OH-PF6

Fig.4 DSC curves of neat PLA and the blends：（A） neat PLA， the blends of PLA/ECO-OH-PF6 and PLA/ESO/ECO-OH-PF6；（B） neat PLA， the blends of PLA/ECO-OH-PF6 and PLA/AX8900/ECO-OH-PF6；（C） neat PLA， the blends of PLA/ECO-OH-PF6 and PLA/PEGDE/ECO-OH-PF6

Fig.5 Tensile stress-strain curves of the blends：（A） the blends of PLA/ECO-OH-PF6；（B） the blends of PLA/ESO/ECO-OH-PF6；（C） the blends of PLA/AX8900/ECO-OH-PF6；（D） the blends of PLA/PEGDE/ECO-OH-PF6

Fig.6 Impact strength of the blends：（A） the blends of PLA/ECO-OH-PF6；（B） the blends of PLA/ESO/ECO-OH-PF6；（C） the blends of PLA/AX8900/ECO-OH-PF6；（D） the blends of PLA/PEGDE/ECO-OH-PF6

Fig.7 SEM images for impact section of the blends

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Modification of Polylactic Acid by Reactive Blending with Functionalized Imidazolium-based Ionomers and Epoxy-containing Additives

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