Modification of surface of natural fibers by high-energy gamma irradiation (6 MV) is a competent process for enhancing the adhesion between fiber and matrix. Composites reinforced with natural fiber have gained a prominent place in the field of research and innovation due to the advantages such as low cost, lightweight and environment friendly. We have studied the thermal properties of biodegradable composites using biodegradable polymer poly(lactic) acid and fiber of Luffa cylindrica (LC) fabricated by using injection molding technique. Before reinforcement LC fibers are irradiated with gamma rays of 0.5, 1 and 2 Gy using 6 MV linear accelerator at room temperature in the presence of air. The thermal properties like glass transition temperature (T_g), crystallization temperature (T_cc), melting peak temperature (T_m) and thermal stability of the composites are studied using differential scanning calorimetry in the temperature range from 30 to 250 °C and thermogravimetric analysis in temperature range from 20 to 700 °C. The variation of these properties in response to the irradiation dose and fiber loading is analyzed in detail. It is observed that with increase in irradiation dose, glass transition temperature and crystallization temperature are increasing. However, the thermal stability of the composites is found to decrease with increase in irradiation dose.

通过高能伽马射线辐照（6 MV）改性天然纤维表面是增强纤维与基质之间粘附力的有效方法。天然纤维增强的复合材料由于具有成本低，重量轻和环境友好等优点而在研究和创新领域中占有重要地位。我们已经研究了可生物降解复合材料的热性能，其中使用可生物降解的聚合物聚乳酸和丝瓜纤维（LC）通过注射成型技术制造。在增强之前，在室温下，在空气中，使用6 MV线性加速器，用0.5、1和2 Gy的伽马射线辐照LC纤维。像玻璃化转变温度（T _g），差示扫描量热法在30至250°C的温度范围内以及热重分析在20至700°C的温度范围内，研究了复合材料的结晶温度（T _cc），熔融峰值温度（T _m）和热稳定性。 。详细分析了这些性质随辐照剂量和纤维负载的变化。观察到随着辐照剂量的增加，玻璃化转变温度和结晶温度也在增加。然而，发现复合物的热稳定性随着照射剂量的增加而降低。