PLA-g-GMA的制备及其对PBAT/PLA共混物结晶性能的影响
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1.华南理工大学 材料科学与工程学院;2.广东必得福医卫科技股份有限公司

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Preparation of PLA-g-GMA and its effect on crystallization properties of PBAT/PLA blends
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1.School of Materials Science and Engineering,South China University of Technology;2.Guangdong Beautiful Health Company Limited

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    摘要:

    采用转矩流变仪制备的聚乳酸-甲基丙烯酸缩水甘油酯接枝物(PLA-g-GMA)作为聚(对苯二甲酸/己二酸丁二酯)(PBAT)与聚乳酸(PLA)共混材料的相容剂,采用FTIR、1HNMR对PLA与GMA不同配比下PLA-g-GMA的接枝率进行分析,并通过DSC、SEM研究添加不同含量相容剂对PBAT/PLA共混物结晶以及微观形貌的影响。结果表明:GMA成功接枝到PLA上,当GMA添加量为总质量20%时,PLA-g-GMA有效接枝率达到6.44%;相容剂的加入使得共混物中PLA在降温过程中形成的结晶结构更加完善,当相容剂添加量为总质量6%时冷结晶峰消失;当相容剂质量分数4%时,PBAT/PLA共混物结晶温度由未添加相容剂时的75.4 ℃下降至68.0 ℃;PLA-g-GMA的加入使得共混物在结晶初期速率常数由0.83(未添加相容剂)下降至0.68(相容剂质量分数10%),抑制了初期PLA晶核产生,但促使第二阶段结晶速率由1.28(未添加相容剂)提高到1.38(相容剂质量分数2%),促进了PBAT晶体生长;相容剂使得脆断截面中PLA与PBAT之间剥离程度减小;当相容剂质量分数为8%时,PBAT/PLA共混纤维强度由未添加PLA-g-GMA时的0.25 cN/dtex提高至0.33 cN/dtex。

    Abstract:

    Polylactic acid-graft-glycidyl methacrylate (PLA-g-GMA) was prepared by torque rheometer as the compatibilizer of PBAT and PLA blends. The grafting rate of PLA-g-GMA at different proportions of PLA and GMA were analyzed by FTIR and 1H-NMR. The effects of the compatibilizer on crystallization and microstructure of PBAT/PLA blends were studied by DSC and SEM. The results showed that GMA was successfully grafted onto PLA. When the amount of GMA was 20% of the total mass, the grafting rate of PLA-g-GMA reached 6.44%. The addition of compatibilizer improved the crystallization structure of PLA in the blends during cooling, and the cold crystallization peak disappeared when the addition amount was 6% of the total mass. When the mass fraction of the compatibilizer was 4%, the crystallization temperature of PBAT/PLA blends decreased from 75.4 ℃(without compatibilizer) to 68.0 ℃. The addition of PLA-g-GMA reduced the initial crystallization rate constant of the blends from 0.83(without compatibilizer) to 0.68(when the mass fraction of compatibilizer was 10%), inhibited PLA from forming crystal nucleus. But it increased the second stage crystallization rate constant from 1.28(without compatibilizer) to 1.38(when the mass fraction of compatibilizer was 2%), which promoted the growth of PBAT crystals; The compatibilizer reduced the degree of detachment between PLA and PBAT in the brittle fracture section. When the mass fraction of compatibilizer was 8%, the strength of the PBAT/PLA blend fiber increased from 0.25 cN/dtex to 0.33 cN/dtex.

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刘嘉铨,李孙辉,郭熙桃,严玉蓉. PLA-g-GMA的制备及其对PBAT/PLA共混物结晶性能的影响[J].精细化工,2023,40(3):

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  • 收稿日期:2022-07-13
  • 最后修改日期:2022-09-12
  • 录用日期:2022-09-13
  • 在线发布日期: 2023-02-17
  • 出版日期: 2022-09-30