Study on Modification and Properties of Polylactic Acid/ Bamboo Flour Composites

doi:10.19491/j.issn.1001-9278.2020.07.004

Abstract

Abstract:

In this work, polylactic acid (PLA)/bamboo flour (BF) composites were prepared by a XSS?300 torque rheometer using ethylene octene copolymer grafted with glycidyl methacrylate (POE?g?GMA) as a compatibilizer and TPW604 as a lubricant. The effects of addition amounts of BF, POE?GMA and TPW604 on the tensile and impact properties, thermal stability, morphology and rheological properties of PLA/BF composites were investigated in details. The results indicated that the composites exhibited the optimum mechanical properties at the BF content of 35 phr, the POE?g?GMA content of 10 phr, and the TPW604 content of 1 phr, and meanwhile their compatibility and fluidity of were also improved significantly.

Key words: polylactic acid, bamboo flour, compatibilizer, lubricant, modification

CLC Number:

TQ 321

Xinyu SONG, Yunxuan WENG, Caili ZHANG, Zhigang HUANG. Study on Modification and Properties of Polylactic Acid/ Bamboo Flour Composites[J]. China Plastics, 2020, 34(7): 21-29.

Figures/Tables 14

Fig.1. Mechanical properties of PLA/BF/POE?GMA composites

Fig.2. Mechanical properties of composites with different amounts of BF content

Fig.3. Mechanical properties of composites with different amounts of TPW604 content

Fig.4. Scanning electron micrograph of impact cross section of PLA/BF/POE?GMA composites (×5 000)

Fig.5. Scanning electron micrograph of the impact cross section of PLA/BF/POE?GMA composites (×5 000)

Fig.6. Scanning electron micrograph of the impact cross section of composites with different amounts of TPW604 content (×5 000)

Fig.7. Thermal weight loss curve of PLA/BF/POE?GMA composites

样品	5 %失重温度/℃	50 %失重温度/℃	DTG峰值温度/℃
纯PLA	341	369	373
POE?GMA含量为0	302	350	353
POE?GMA含量为5 %	307	355	359
POE?GMA含量为10 %	308	358	361
POE?GMA含量为20 %	311	359	359
POE?GMA含量为30 %	318	361	358

Tab.1. Thermal weight loss temperature of PLA/BF/POE?GMA composites

BF添加量/%	5 %失重温度/ ℃	50 %失重温度/ ℃	DTG峰值温度/ ℃
15（未处理）	302	350	354
15	308	358	361
25	296	348	352
35	290	345	348

Tab.2. Thermal weight loss temperature of composites with different BF content

Fig.8. Thermal weight loss curve of PLA/BF/POE?GMA composites

Fig.9. Thermal weight loss curve of composites with different TPW604 content

TPW604添加量/%	5 %失重温度/℃	50 %失重温度/℃	DTG峰值温度1/℃	DTG峰值温度2/℃	DTG峰值温度3/℃
0	290	345	348	-	476
0.5	282	337	335	-	476
1	278	331	328	-	477
1.5	270	322	317	355	474
2	269	323	315	356	475

Tab.3. Thermal weight loss temperature of composites with different TPW604 content

Fig.10. Melt flow rate of composites with different BF content

Fig.11. Complex viscosity of the composites with different TPW604 content

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