Poly(lactic acid)-starch/Expandable Graphite (PLA-starch/EG) Flame Retardant Composites

被引：12

作者：

Mngomezulu, Mfiso Emmanuel ^{[1
]}

Luyt, Adriaan Stephanus ^{[2
]}

Chapple, Steve Anthony ^{[3
]}

John, Maya Jacob ^{[3
,4
]}

机构：

[1] Univ Free State, Dept Chem, Qwaqwa Campus,Private Bag X13, ZA-9866 Phuthaditjhaba, South Africa

[2] Qatar Univ, Ctr Adv Mat, POB 2713, Doha, Qatar

[3] CSIR Mat Sci & Mfg, Polymers & Composites Competence Area, POB 1124, ZA-6000 Port Elizabeth, South Africa

[4] Nelson Mandela Metropolitan Univ, Fac Sci, Dept Chem, POB 1600, ZA-6000 Port Elizabeth, South Africa

来源：

JOURNAL OF RENEWABLE MATERIALS | 2018年 / 6卷 / 01期

基金：

新加坡国家研究基金会;

关键词：

Poly(lactic acid)-starch composites; expandable graphite; thermal stability; flammability properties; RIGID POLYURETHANE FOAMS; LAYERED DOUBLE HYDROXIDE; EXPANDABLE GRAPHITE; THERMAL-DEGRADATION; FIRE BEHAVIOR; ACID); FLAMMABILITY; POLYLACTIDE; BLENDS; POLY(EPSILON-CAPROLACTONE);

D O I：

10.7569/JRM.2017.634140

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

This work reports on the effect of commercial expandable graphite (EG) on the flammability and thermal decomposition properties of PLA-starch blend. The PLA-starch/EG composites were prepared by melt-mixing and their thermal stability, volatile pyrolysis products and flammability characteristics were investigated. The char residues of the composites, after combustion in a cone calorimeter, were analyzed with environmental scanning electron microscopy (ESEM). The thermal decomposition stability of the composites improved in the presence of EG. However, the char content was less than expected as per the combination of the wt% EG added into PLA-starch and the % residue of PLA-starch. The flammability performance of the PLA-starch/EG composites improved, especially at 15 wt% EG content, due to a thick and strong worm-like char structure. The peak heat release rate (PHRR) improved by 74%, the total smoke production (TSP) by 40% and the specific extinction area (SEA) by 55%. The improvements are attributed to the ability of EG to exfoliate at increased temperatures during which time three effects occurred: i) cooling due to an endothermic exfoliation process, ii) dilution due to release of H2O, SO2 and CO2 gases, and iii) formation of a protective intumescent char layer. However, the CO and CO2 yields were found to be unfavorably high due to the presence of EG.

引用

页码：26 / 37

页数：12

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