Effect of a chain extender on the properties of poly(lactic acid)/zinc oxide/copper chlorophyll acid antibacterial nanocomposites

In this work, hydroxyl-terminated lactic acid prepolymer was firstly prepared by adding diethylene glycol in the condensation of lactic acid. Molecular weight, acid value and structure of prepolymer were characterized. The results showed that the prepolymer was hydroxyl-terminated with weight average molecular weight (MW) of 10,000 g/mol. After that, the chain linking polymerization of the prepolymer was carried out in a glass tube at 160 °C for 1 h employing 1,6-hexamethylene diisocyanate (HMDI) as a chain extender. By varying the hydroxyl/isocyanate ratio, it was found that the OH/NCO ratio of 1:2 seemed to be the most suitable ratio which gave PLA with the maximum MW of 93,000 g/mol.

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Mechanical recycling of poly(lactic acid): Evaluation of a chain extender and a peroxide as additives for upgrading the recycled plastic.

Journal of Cleaner Production ◽

10.1016/j.jclepro.2019.01.206 ◽

2019 ◽

Vol 219 ◽

pp. 46-56 ◽

Cited By ~ 19

Author(s):

Freddys R. Beltrán ◽

Celia Infante ◽

Ma Ulagares de la Orden ◽

Joaquín Martínez Urreaga

Keyword(s):

Lactic Acid ◽

Chain Extender ◽

Poly Lactic Acid ◽

Mechanical Recycling ◽

A Chain

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Biodegradable Plastics Prepared from Poly(lactic acid), Poly(butylene succinate) and Microcrystalline Cellulose Extracted from Waste-Cotton Fabric with a Chain Extender

Journal of Polymers and the Environment ◽

10.1007/s10924-014-0689-0 ◽

2014 ◽

Vol 23 (1) ◽

pp. 114-125 ◽

Cited By ~ 25

Author(s):

Phasawat Chaiwutthinan ◽

Vimolvan Pimpan ◽

Saowaroj Chuayjuljit ◽

Thanawadee Leejarkpai

Keyword(s):

Lactic Acid ◽

Cotton Fabric ◽

Microcrystalline Cellulose ◽

Biodegradable Plastics ◽

Chain Extender ◽

Poly Lactic Acid ◽

Butylene Succinate ◽

A Chain

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Processing and characterization of poly(lactic acid) blended with polycarbonate and chain extender

Journal of Polymer Engineering ◽

10.1515/polyeng-2013-0309 ◽

2014 ◽

Vol 34 (7) ◽

pp. 665-672 ◽

Cited By ~ 7

Author(s):

Yottha Srithep ◽

Wuttipong Rungseesantivanon ◽

Bongkot Hararak ◽

Krisda Suchiva

Keyword(s):

Molecular Weight ◽

Lactic Acid ◽

Gel Permeation Chromatography ◽

Chain Extender ◽

Chain Extension ◽

Morphological Properties ◽

Poly Lactic Acid ◽

Scanning Calorimetry ◽

Commercial Applications ◽

A Chain

Abstract Currently, use of poly(lactic acid) (PLA) is limited for commercial applications because it has a low heat resistance. In this research, an increase of over 40°C heat distortion temperature (HDT) of PLA alloy was obtained by blending PLA with polycarbonate (PC) and a chain extender (CE). Molecular weight, thermal, mechanical and morphological properties of PLA and PC blend with different CE contents were investigated. Gel permeation chromatography (GPC) results showed that some PLA-PC copolymers were produced and the compatibility of the PLA phase and in the PC phase was improved via the chain extension reaction. In addition, the reaction induced by CE also affected the crystallization behaviors of PLA, as observed from differential scanning calorimetry (DSC) results and the enthalpy of melting of PLA decreased with increasing CE content. The combined effects of the CE increasing molecular weight, improving compatibility and limiting the crystallization behavior of PLA/PC alloy greatly improved the HDT.

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