Preparation and Properties of PBAT/PBAT⁃GMA/PLA Biodegradable Films

doi:10.12422/j.issn.1672-6952.2026.02.004

Abstract

Abstract:

Poly(adipate⁃butylene terephthalate) (PBAT) was grafted with glycidyl methacrylate (GMA) to prepare PBAT⁃GMA, which was subsequently blended with PBAT and poly(lactic acid) (PLA) to obtain PBAT/PBAT⁃GMA/PLA blends. The effects of PBAT⁃GMA content on the mechanical properties, micromorphology, barrier properties, and degradability of PBAT/PBAT⁃GMA/PLA films were systematically studied. The results indicate that increasing the mass fraction of PBAT⁃GMA significantly enhanced the mechanical properties of the films. When the mass fraction of PBAT⁃GMA is 15%, the tensile strength increased from 15.28 MPa (longitudinal) and 12.51 MPa (transverse) without PBAT⁃GMA to 25.61 MPa (longitudinal) and 19.59 MPa (transverse), respectively. Similarly,the elongation at break improved from 109.23% (longitudinal) and 141.32% (transverse) to 217.63% (longitudinal) and 311.22% (transverse). It demonstrates that the incorporation of PBAT⁃GMA effectively enhanced the compatibility between PBAT and PLA,thereby improving the mechanical properties of the blend. Moreover, with higher PBAT⁃GMA content, the barrier properties of PBAT/PBAT⁃GMA/PLA films were also significantly improved.However,the degradation rate of PBAT/PBAT⁃GMA/PLA films decreased slightly with the increase of PBAT⁃GMA mass fraction, indicating that the durability of the materials was improved.

Key words: Poly(adipate?butylene terephthalate) (PBAT), Poly(lactic acid) (PLA), Compatibility, Films, Biodegradation

摘要：

采用甲基丙烯酸缩水甘油酯（GMA）对聚己二酸⁃对苯二甲酸丁二醇酯（PBAT）进行接枝改性制备PBAT⁃GMA，将其与PBAT和聚乳酸（PLA）共混挤出并吹塑成膜；系统研究了PBAT⁃GMA质量分数对PBAT/PBAT⁃GMA/PLA薄膜的力学性能、微观形态、阻隔性能及降解性能的影响。结果表明，随着PBAT⁃GMA质量分数的增加，PBAT/PBAT⁃GMA/PLA薄膜的力学性能得到明显的提升；当PBAT⁃GMA质量分数为15%时，与未添加PBAT⁃GMA的共混物相比，PBAT/PBAT⁃GMA/PLA薄膜的拉伸强度由15.28 MPa（纵向）和12.51 MPa（横向）分别提高至25.61 MPa（纵向）和19.59 MPa（横向），断裂伸长率由109.23%（纵向）和141.32%（横向）提高至217.63%（纵向）和311.22%（横向），表明PBAT⁃GMA的加入有效改善了PBAT与PLA的相容性，提高了薄膜的力学性能；随着PBAT⁃GMA质量分数的增加，PBAT/PBAT⁃GMA/PLA薄膜的阻隔性能也得到了明显提升，而其降解速率随着PBAT⁃GMA质量分数的增加略有降低，说明材料的耐久性有所改善。

关键词: 聚己二酸?对苯二甲酸丁二醇酯（PBAT）, 聚乳酸（PLA）, 相容性, 薄膜, 生物降解

CLC Number:

TQ323.4

Yang LIU, Guangxiang ZHANG, Jiayi YANG, Ruiqing YIN, Yanfeng BI, Guiyan ZHAO. Preparation and Properties of PBAT/PBAT⁃GMA/PLA Biodegradable Films[J]. Journal of Liaoning Petrochemical University, 2026, 46(2): 31-39.

刘阳, 张广翔, 杨佳怡, 尹睿卿, 毕研峰, 赵桂艳. PBAT/PBAT⁃GMA/PLA生物降解薄膜的制备及性能研究[J]. 辽宁石油化工大学学报, 2026, 46(2): 31-39.

Figures/Tables 13

Table 1 The proportion of each component of PBAT/PBAT?GMA/PLA blend

样品	w（PBAT）/ %	w（PBAT⁃GMA）/%	w（PLA）/ %
共混物1	70	0	30
共混物2	65	5	30
共混物3	60	10	30
共混物4	55	15	30
共混物5	50	20	30
共混物6	45	25	30
共混物7	40	30	30

Fig.1 FTIR spectra of PBAT and PBAT?GMA

Fig.2 Synthesis strategy for PBAT?GMA

Fig.3 Elongation at break and tensile strength of PBAT/PBAT?GMA/PLA films

Fig.4 SEM images of the freeze?fractured surfaces of PBAT/PBAT?GMA/PLA blends

Fig.5 Diagram of the reaction mechanism between PBAT?GMA and PLA

Fig.6 Variation curves of complex viscosity with angular frequency for PBAT, PBAT?GMA, PLA, and PBAT/PBAT?GMA/PLA blends

Fig.7 The impact of PBAT?GMA mass fraction on the water vapor permeability of PBAT/PBAT?GMA/PLA films

Fig.8 The impact of PBAT?GMA mass fraction on the oxygen permeability of PBAT/PBAT?GMA/PLA films

Fig.9 SEM images of the of PBAT/PBAT?GMA/PLA films before and after degradation

Fig.10 Diagram of hydrolytic degradation mechanism in soil of PBAT

Fig.11 Diagram of hydrolytic degradation mechanism in soil of PLA

Fig.12 Diagram of hydrolytic degradation mechanism in soil of PBAT/PBAT?GMA/PLA

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