Polylactic acid (PLA) with eco-friendliness exhibits extensive potential applications. In order to enhance fire-resistance of PLA, this manuscript reports the preparation of boron-containing ammonium polyphosphate (B-APP) using 3-aminophenyl boronic acid and ammonium polyphosphate through ion exchange reaction, and incorporated into PLA matrix. The limiting oxygen index (LOI) of PLA-5% B-APP was increased from 19.2% to 29.4% and a UL-94 V-0 rating. In the cone calorimeter tests, PLA-5% B-APP presented a total heat release (THR) reduction from 81 MJ·m⁻² to 67 MJ·m⁻² and an improvement from 1.6% to 6.7% in char residue comparing with PLA. The mechanism of B-APP was mainly ascribed to the formation of glassy char layers to block the heat and oxygen transfer. For mechanical properties, it could be also found that the elongation at break and impact strength were improved at the presence of 5% B-APP.

具有生态友好性的聚乳酸 (PLA) 具有广泛的潜在应用。为了提高 PLA 的耐火性，本手稿报道了使用 3-氨基苯基硼酸和多磷酸铵通过离子交换反应制备含硼多磷酸铵 (B-APP)，并掺入 PLA 基质中。PLA-5% B-APP 的极限氧指数 (LOI) 从 19.2% 增加到 29.4%，达到 UL-94 V-0 等级。在锥形量热仪测试中，PLA-5% B-APP 的总放热 (THR) 从 81 MJ·m ^-2减少到 67 MJ·m ^-2与 PLA 相比，焦炭残留量从 1.6% 提高到 6.7%。B-APP 的机制主要归因于玻璃炭层的形成以阻止热量和氧气的传递。对于机械性能，还可以发现在 5% B-APP 的存在下，断裂伸长率和冲击强度得到改善。