Study on strengthening and heat resistance of PBAT composites based on in⁃situ fiber formation and stereo⁃composite

doi:10.19491/j.issn.1001-9278.2024.12.006

Abstract

Abstract:

Based on the self⁃built processing equipment for melt blending ⁃ high speed hot drawing， the effects of dispersed phase content of polylactic acid （PLA） on the microfiber morphology， the viscoelasticity， and crystallization behavior of poly（adipate⁃butylene terephthalate）（PBAT） matrix， PLA stereo⁃composite crystal （sc⁃PLA）， and the mechanical and thermal properties of PBAT/sc⁃PLA composites were investigated through a combination of in⁃situ fiber formation and stereo⁃composite technologies. The results indicated that the PBAT/sc⁃PLA microfiber composites with a minimum fiber diameter of 210 nm could be continuously prepared， and the PLA microfibers were intertangled in the PBAT matrix to form a network structure and also obtained a uniform dispersion. The presence of the sc⁃PLA microfiber network makes the viscoelastic behavior of the composites change from the “liquid⁃like” to “solid⁃like” state. Under the fiber induction， the relative crystallinity and crystal content of sc⁃PLA in the PBAT/sc⁃PLA composites were significantly increased. After adding 30 wt% PLA， the relative crystallinity of sc⁃PLA in the PBAT/ SC⁃PLA composite reached 46.4 %， and its yield strength and elastic modulus were higher than that of pure PBAT by 175.3 % and 404 %， respectively. Their Vica softening temperatures reached nearly 90 ℃. These research results provide a technical means for the large⁃scale preparation of reinforced and heat⁃resistant PBAT composites.

Key words: in situ fiber formation, polyadipate/butylene terephthalate, stereo?composite crystal, heat resistance, mechanical property

CLC Number:

TQ325.5

LI Yangyang, ZHANG Tao, QIAO Min, JIANG Jing, WANG Xiaofeng, LI Qian. Study on strengthening and heat resistance of PBAT composites based on in⁃situ fiber formation and stereo⁃composite[J]. China Plastics, 2024, 38(12): 37-42.

Figures/Tables 9

样品名称	PBAT/%	PLLA/%	PDLA/%
PBAT	100	0	0
10DP（S）	90	5	5
20DP（S）	80	10	10
30DP（S）	70	15	15
10DP（F）	90	5	5
20DP（F）	80	10	10
30DP（F）	70	15	15

Tab.1. Material ratio of each component

Fig.1. Schematic diagram of in⁃situ fiber forming process

Fig.2. SEM of PBAT/sc⁃PLA composites before（a1）~（c1） and after ［（a2）~（c2）， with etched PBAT matrix］ in situ fibril formation

Fig.3. PLA size statistics of PBAT/sc⁃PLA composites before and after in⁃situ fiber formation

Fig.4. Viscoelasticity of PBAT/sc⁃PLA composite before and after fiber formation

Fig.5. DSC curves of PBAT/sc⁃PLA blends and microfibril complexes

样品	ΔH_m⁃sc/J·g^-1	ΔH_m⁃hc/J·g^-1	X_c/%	X_c⁃sc/%
10DP（F）	1.5	2.3	34.3	13.5
20DP（F）	7.7	1.9	36.3	29.1
30DP（F）	14.2	4.0	46.4	36.2
10DP（S）	1.7	1.6	27.9	14.2
20DP（S）	6.6	2.5	35.6	25.8
30DP（S）	10.9	4.3	39.8	28.5

Tab.2. Enthalpy and crystallinity of PBAT/sc⁃PLA before and after stretching

Fig.6. Mechanical properties of PBAT/sc⁃PLA complex

Fig.7. Heat resistance of pure PBAT and PBAT/sc⁃PLA composites

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