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Title: Enhancing the Melt Strength of Poly(Lactic Acid) via Micro-Crosslinking and Blending with Poly(Butylene Adipate-co-Butylene Terephthalate)for the Preparation of Foams

Abstract

The melt strength of poly(lactic acid) (PLA) is an important factor in preparing foams and blowing films. Aiming to endow PLA with a suitable melt strength via a slight crosslink, a superficial micro-crosslinking method was introduced in which the PLA feed was mixed with benzoyl peroxide (BPO) and crosslinked in a 100 °C oven for 1 h. Additionally, poly(butyleneadipate-co-terephthalate) (PBAT) was blended with the crosslinked PLA (C-PLA) to further improve melt strength and viscosity. The blend foams were prepared using a single-screw extruder and azodicarbonamide as a foaming agent. The properties were characterized by gel fraction, melt flow rate (MFR), rheometry, DSC and SEM. The rheological results showed that the complex viscosity and storage modulus of C-PLA and C-PLA/PBAT blends increased, attributed to the micro-crosslinking and addition of PBAT and indicating an improvement in melt strength. Furthermore, the crystallization of modified PLA was also enhanced. Compared with pure PLA foams, the C-PLA/PBAT blend foams showed larger cells with more uniform shapes and homogenous distribution. This approach to improve the melt strength of polymers with micro-crosslinking and blending with PBAT represents an attractive method for preparing foams with regular cells.

Authors:
; ; ;  [1]
  1. Hubei University of Technology, Hubei Provincial Key Laboratory of Green Materials for Light Industry (China)
Publication Date:
OSTI Identifier:
22788351
Resource Type:
Journal Article
Journal Name:
Journal of Polymers and the Environment
Additional Journal Information:
Journal Volume: 25; Journal Issue: 4; Other Information: Copyright (c) 2017 Springer Science+Business Media, LLC; Article Copyright (c) 2016 Springer Science+Business Media New York; http://www.springer-ny.com; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1566-2543
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; BENZOYL PEROXIDE; BUTENES; CALORIMETRY; CROSS-LINKING; CRYSTALLIZATION; FLOW RATE; FOAMS; GELS; LACTIC ACID; POLYMERS; SCANNING ELECTRON MICROSCOPY; THIN FILMS; VISCOSITY

Citation Formats

Zhang, Rong, Cai, Chang, Liu, Qingting, and Hu, Shengfei. Enhancing the Melt Strength of Poly(Lactic Acid) via Micro-Crosslinking and Blending with Poly(Butylene Adipate-co-Butylene Terephthalate)for the Preparation of Foams. United States: N. p., 2017. Web. doi:10.1007/S10924-016-0911-3.
Zhang, Rong, Cai, Chang, Liu, Qingting, & Hu, Shengfei. Enhancing the Melt Strength of Poly(Lactic Acid) via Micro-Crosslinking and Blending with Poly(Butylene Adipate-co-Butylene Terephthalate)for the Preparation of Foams. United States. doi:10.1007/S10924-016-0911-3.
Zhang, Rong, Cai, Chang, Liu, Qingting, and Hu, Shengfei. Fri . "Enhancing the Melt Strength of Poly(Lactic Acid) via Micro-Crosslinking and Blending with Poly(Butylene Adipate-co-Butylene Terephthalate)for the Preparation of Foams". United States. doi:10.1007/S10924-016-0911-3.
@article{osti_22788351,
title = {Enhancing the Melt Strength of Poly(Lactic Acid) via Micro-Crosslinking and Blending with Poly(Butylene Adipate-co-Butylene Terephthalate)for the Preparation of Foams},
author = {Zhang, Rong and Cai, Chang and Liu, Qingting and Hu, Shengfei},
abstractNote = {The melt strength of poly(lactic acid) (PLA) is an important factor in preparing foams and blowing films. Aiming to endow PLA with a suitable melt strength via a slight crosslink, a superficial micro-crosslinking method was introduced in which the PLA feed was mixed with benzoyl peroxide (BPO) and crosslinked in a 100 °C oven for 1 h. Additionally, poly(butyleneadipate-co-terephthalate) (PBAT) was blended with the crosslinked PLA (C-PLA) to further improve melt strength and viscosity. The blend foams were prepared using a single-screw extruder and azodicarbonamide as a foaming agent. The properties were characterized by gel fraction, melt flow rate (MFR), rheometry, DSC and SEM. The rheological results showed that the complex viscosity and storage modulus of C-PLA and C-PLA/PBAT blends increased, attributed to the micro-crosslinking and addition of PBAT and indicating an improvement in melt strength. Furthermore, the crystallization of modified PLA was also enhanced. Compared with pure PLA foams, the C-PLA/PBAT blend foams showed larger cells with more uniform shapes and homogenous distribution. This approach to improve the melt strength of polymers with micro-crosslinking and blending with PBAT represents an attractive method for preparing foams with regular cells.},
doi = {10.1007/S10924-016-0911-3},
journal = {Journal of Polymers and the Environment},
issn = {1566-2543},
number = 4,
volume = 25,
place = {United States},
year = {2017},
month = {12}
}