Structure and Properties of Epoxy Modified PLA/Low Melting Point PA6 Composites

doi:10.11901/1005.3093.2018.533

Chinese Journal of Materials Research

2019, Vol. 33

Issue (4): 261-270 DOI: 10.11901/1005.3093.2018.533

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Structure and Properties of Epoxy Modified PLA/Low Melting Point PA6 Composites

Mingzhuan LI^1,²,Xiaoying HU^1,²,Min HE^1,²,Jie YU²,Shengjun LU^1,²(

)

1. College of Materials and Metallurgy, Guizhou University, Guiyang 550025, China
2. National Engineering Research Center for Compounding and Modification of Polymeric Materials, Guiyang 550014, China

Cite this article:

Mingzhuan LI,Xiaoying HU,Min HE,Jie YU,Shengjun LU. Structure and Properties of Epoxy Modified PLA/Low Melting Point PA6 Composites. Chinese Journal of Materials Research, 2019, 33(4): 261-270.

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Abstract

Composites of epoxy resin modified polylactic acid (ePLA)/low melting point nylon 6 (LMPA6) were prepared via method of “melting extrusion—hot stretching—quenching”. The crystallization behavior, thermal, rheological and mechanical properties of the composites were investigated by means of differential scanning calorimetry (DSC), X-ray diffraction (XRD), thermogravimetric analysis (TGA), rheometer and electronical stretching machine. Results show that the addition of LMPA6 changed the crystal structure of PLA, and further significantly changed the cold crystallization temperature and melting temperature of cold crystallization of the composite; The addition of LMPA6 could enhance the thermal stability and the glass transition temperature (T_g) of the ePLA/LMPA6 composites, while the storage modulus (G') decrease nonlinearly when the strain (γ) exceeds the critical strain (γ_C), namely the “Payne” effect appeared; The composites exhibited the characteristics of non-Newtonian fluids—"shear thinning", and which was more pronounced with the increasing content of LMPA6; When the LMPA6 content was 7%, the microfibrous structure appeared in the composite, thereby which exhibited the best compatibility; The addition of LMPA6 could enhance the strength and toughness of the composites to a certain extent, especially, when the LMPA6 content was 7%, the tensile strength (72.8 MPa) and the impact strength (5.0 kJ/m²) reached the extreme value, which were 10.8% and 78.6% higher than that of modified PLA (65.7 MPa, 2.8 kJ/m²), respectively.

Key words: composites polylactic acid epoxy resin low melting point nylon 6 rheological behavior toughening

Received: 03 September 2018

ZTFLH:

TQ323

Fund: National Natural Science Foundation of China(51563002);Guizhou Province "100-level" Innovative Talents Project, Qianke Union Platform Talent([2016]5653)

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	Xiaoying HU
	Min HE
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	Shengjun LU

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https://www.cjmr.org/EN/10.11901/1005.3093.2018.533 OR https://www.cjmr.org/EN/Y2019/V33/I4/261

Table 1 Composition of ePLA/LMPA6 composites

Fig.1 The structure of the ePLA/PA6 composites (a) re-action mechanism diagram of PLA-PA6 cross-linked structure produced by DCP, (b) reaction mechanism diagram of epoxy group with PLA and PA6, (c) reaction mechanism diagram of PLA-PA6 crosslinked structure with epoxy functional group

Fig.2 SEM micrographs of ePLA/LMPA6 composites (a) without epoxy resin, (b) without DCP, (c) 1 phr of LMPA6, (d) 3 phr of LMPA6, (e) 5 phr of LMPA6, (f) 7 phr of LMPA6

Fig.3 XRD curves of ePLA/LMPA6 composites with different LMPA6 contents

Fig.4 DSC curves of ePLA/LMPA6 composites with different LMPA6 contents (a) the first rising temperature curve, (b) the crystallization curve, (c) the melting curve

Table 2 DSC dates of ePLA/LMPA6 composites with different LMPA6 contents

Fig.5 TG curves of ePLA/LMPA6 composites with different LMPA6 contents (a) 0%, (b) 1%, (c) 3%, (d) 5%, (e) 7%

Fig.6 Dynamic mechanical curves of ePLA/LMPA6 composites with different LMPA6 contents (a) the storage modulus (G') as a function of temperature, (b) the loss factor (tanδ) as a function of temperature

Fig.7 Curves of storage modulus G' versus strain (γ) for ePLA/LMPA6 composites with different LMPA6 contents

Fig.8 Curves of storage modulus (G'), loss modulus (G″) versus frequency (ω) of ePLA/LMPA6 with different LMPA6 contents

Fig.9 Shear viscosity (η) versus shear rate (γ) of ePLA/LMPA6 composites with different LMPA6 contents

Fig.10 The mechanical properties of ePLA/LMPA6 composites with different LMPA6 contents (a) the graph of impact intensity, (b) the graph of tensile strength and elongation at break

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