Preparation of high molecular weight poly(L-lactic acid) in micro compounder

Ji Xing Xie; Rong Jie Yang

Preparation of high molecular weight poly(L-lactic acid) in micro compounder

Ji Xing Xie^*, Rong Jie Yang

^*Corresponding author for this work

School of Material Science and Engineering

Beijing Institute of Technology

Research output: Contribution to journal › Article › peer-review

Abstract

The process of poly(L-lactic acid) (PLLA) reactive extrusion was studied in MicroCompounder. Triphenyl phosphite (TPPi) was used as chain extender to increase the molecular weight of the PLLA prepared by melt-polycondensation from L-lactic acid. The influences of the temperature, screw speed, resident time and the amount of TPPi were studied on the mixing torque of PLLA. With addition of 2% TPPi, the molecular weight of the PLLA increases from 62, 100 g/mol to 126, 000 g/mol. The structure of PLLA was kept after the reactive extrusion. The final PLLA products had low T_g and T_m due to existence of the impurities. The mechanical properties of the products are approximate to that of commercial PLLA.

Original language	English
Pages (from-to)	116-119
Number of pages	4
Journal	Gaofenzi Cailiao Kexue Yu Gongcheng/Polymeric Materials Science and Engineering
Volume	24
Issue number	9
Publication status	Published - Sept 2008

Keywords

Chain extending
Poly(L-lactic acid)
Reactive extrusion
Triphenyl phosphite

Cite this

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title = "Preparation of high molecular weight poly(L-lactic acid) in micro compounder",

abstract = "The process of poly(L-lactic acid) (PLLA) reactive extrusion was studied in MicroCompounder. Triphenyl phosphite (TPPi) was used as chain extender to increase the molecular weight of the PLLA prepared by melt-polycondensation from L-lactic acid. The influences of the temperature, screw speed, resident time and the amount of TPPi were studied on the mixing torque of PLLA. With addition of 2% TPPi, the molecular weight of the PLLA increases from 62, 100 g/mol to 126, 000 g/mol. The structure of PLLA was kept after the reactive extrusion. The final PLLA products had low Tg and Tm due to existence of the impurities. The mechanical properties of the products are approximate to that of commercial PLLA.",

keywords = "Chain extending, Poly(L-lactic acid), Reactive extrusion, Triphenyl phosphite",

author = "Xie, {Ji Xing} and Yang, {Rong Jie}",

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TY - JOUR

T1 - Preparation of high molecular weight poly(L-lactic acid) in micro compounder

AU - Xie, Ji Xing

AU - Yang, Rong Jie

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N2 - The process of poly(L-lactic acid) (PLLA) reactive extrusion was studied in MicroCompounder. Triphenyl phosphite (TPPi) was used as chain extender to increase the molecular weight of the PLLA prepared by melt-polycondensation from L-lactic acid. The influences of the temperature, screw speed, resident time and the amount of TPPi were studied on the mixing torque of PLLA. With addition of 2% TPPi, the molecular weight of the PLLA increases from 62, 100 g/mol to 126, 000 g/mol. The structure of PLLA was kept after the reactive extrusion. The final PLLA products had low Tg and Tm due to existence of the impurities. The mechanical properties of the products are approximate to that of commercial PLLA.

AB - The process of poly(L-lactic acid) (PLLA) reactive extrusion was studied in MicroCompounder. Triphenyl phosphite (TPPi) was used as chain extender to increase the molecular weight of the PLLA prepared by melt-polycondensation from L-lactic acid. The influences of the temperature, screw speed, resident time and the amount of TPPi were studied on the mixing torque of PLLA. With addition of 2% TPPi, the molecular weight of the PLLA increases from 62, 100 g/mol to 126, 000 g/mol. The structure of PLLA was kept after the reactive extrusion. The final PLLA products had low Tg and Tm due to existence of the impurities. The mechanical properties of the products are approximate to that of commercial PLLA.

KW - Chain extending

KW - Poly(L-lactic acid)

KW - Reactive extrusion

KW - Triphenyl phosphite

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M3 - Article

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SN - 1000-7555

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SP - 116

EP - 119

JO - Gaofenzi Cailiao Kexue Yu Gongcheng/Polymeric Materials Science and Engineering

JF - Gaofenzi Cailiao Kexue Yu Gongcheng/Polymeric Materials Science and Engineering

IS - 9

ER -

Preparation of high molecular weight poly(L-lactic acid) in micro compounder

Abstract

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