Triphenyl Phosphite Regulates Degradation Behavior and Properties of Polylactic Acid/Ferric Chloride Blend

doi:10.11901/1005.3093.2020.300

Chinese Journal of Materials Research

2021, Vol. 35

Issue (8): 632-640 DOI: 10.11901/1005.3093.2020.300

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Triphenyl Phosphite Regulates Degradation Behavior and Properties of Polylactic Acid/Ferric Chloride Blend

LINGHU Changkai¹, LI Xiaolong¹, LUO Zhu¹(

), YANG Le², XIA Xiaosong¹

^1.Department of Polymer Materials Engineering, College of Materials and Metallurgy, Guizhou University, Guiyang 550025, China
^2.School of Materials and Energy Engineering, Guizhou Institute of Technology, Guiyang 550003, China

Cite this article:

LINGHU Changkai, LI Xiaolong, LUO Zhu, YANG Le, XIA Xiaosong. Triphenyl Phosphite Regulates Degradation Behavior and Properties of Polylactic Acid/Ferric Chloride Blend. Chinese Journal of Materials Research, 2021, 35(8): 632-640.

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Abstract

A rapid degradation material, ferric chloride (FeCl₃) catalyzed polylactic acid (PLA) PLA/FeCl₃ was prepared by the melt blending method, which presents degradation rate of 10 times higher than that of bare PLA. However, the molecular weight of PLA/FeCl₃ is greatly reduced during the processing, which results in decrease in mechanical properties and processability. In order to reduce the over-degradation of PLA/FeCl₃ in melt processing, triphenyl phosphite (TPPi), which has excellent chain extension and plasticizing effect, was introduced into the PLA/FeCl₃ system and melt blended to improve its comprehensive mechanical properties. The degradation rate and comprehensive performance of the prepared samples were investigated via alkaline solution degradation test and various test methods. The results show that the sample P3-1 had the best performance when the ratio of TPPi to FeCl₃ was 3∶1, namely, the tensile strength and flexural strength reached 43.78 MPa and 99.04 MPa, respectively. The mass loss rate of degradation for 8d in alkaline solution is 65.76%, which was much higher than that of 4.67% for bare PLA. The sample containing 2.95 phr FeCl₃ has been able to produce a high degradation rate in the alkaline solution without over-degradation during the processing, thereby obtaining a modified PLA material that can quickly degrade and maintain good mechanical properties.

Key words: composite polylactic acid ferric chloride triphenyl phosphite degradation behavior mechanical property

Received: 20 July 2020

ZTFLH:

TQ323

Fund: Technology Department of Guizhou Province(20195607)

About author: LUO Zhu, Tel: 13985181265, E-mail: luozhu2000@sina.com

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	Changkai LINGHU
	Xiaolong LI
	Zhu LUO
	Le YANG
	Xiaosong XIA

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https://www.cjmr.org/EN/10.11901/1005.3093.2020.300 OR https://www.cjmr.org/EN/Y2021/V35/I8/632

Table 1 Sample material preparation formula (phr)

Fig.1 Torque curves of pure PLA and TPPi modified PLA/FeCl₃ materials during reactive processing

Fig.2 FTIR of pure PLA, TPPi, FeCl₃and purified TPPi modified PLA/FeCl₃materials (a) infrared spectra of all samples; (b) local amplification FTIR of TPPi and its modified samples

Fig.3 TPPi inhibits over-degradation of PLA/FeCl₃ modified materials

Fig.4 Change process of degradation behavior of pure PLA and TPPi modified PLA/FeCl₃ samples in 10% (mass fraction) sodium hydroxide solution (a) 1 d, (b) 3 d, (c) 5 d; (b-1) P2-1 morphologie after 3 days of degradation, (b-2) morphology of all samples after 3 days of degradation

Fig.5 Mass loss rate of pure PLA and TPPi modified PLA/FeCl₃samples in NaOH solution

Fig.6 TG/DTG curves of pure PLA and TPPi modified PLA/FeCl₃ samples

Table 2 Thermogravimetric data of the sample in Fig.6

Fig.7 Energy storage modulus of pure PLA and TPPi modified PLA/FeCl₃materials varies with angular frequency at 170℃

Fig.8 Complex viscosity of pure PLA and TPPi modified PLA/FeCl₃material varies with angular frequency

Fig.9 Molecular weight and distribution of pure PLA and purified TPPi modified PLA/FeCl₃materials

Table 3 GPC parameters of PLA and its modified samples are derived in Fig.9

Fig.10 Mechanical properties of pure PLA and TPPi modified PLA/FeCl₃ materials

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