雄蚕生丝的热学性能研究

Research in Thermal Properties of Raw Silk of Male Silkworm

丝茧育生产正在逐步推广专养雄蚕的品种,研究雄蚕生丝的热学性能有助于更加科学合理地开发利用高品位的雄蚕生丝。以不同试验点雄蚕专用品种生产的生丝和普通家蚕品种生产的生丝为材料,通过差示扫描量热法（DSC）、微商热重法（DTG）、静态热机械分析（TMA）、动态热机械分析（DMA）等多种热力学分析方法,比较2种生丝的热性状。结果表明：雄蚕生丝的热分解温度约为316℃,略高于普通生丝（312℃）;雄蚕生丝的热分解温度区间比普通生丝窄5～7℃,且玻璃化转变温度也较高,说明雄蚕生丝的热稳定性较好;雄蚕生丝经热分解反应后最终的质量损失率较普通生丝低,即雄蚕生丝的热分解残余量较多。依据检测结果认为：雄蚕生丝的储能模量高,刚性好,不易发生形变,并且损耗模量高,损耗角正切值高,损耗因子大,阻尼性能好。

Male silkworm varieties are gradually popularized in raw cocoon production. Study on thermal properties of raw silk produced from male silkworm will contribute to the development and utilization of high grade silk in a more scientific and rational manner. The thermal properties of raw silk produced from male silkworm varieties at various test sites and raw silk produced from normal silkworm varieties were investigated by means of differential scanning calorimetry（ DSC）,derivative thermogravimetric analysis（ DTG）,thermomechanical analysis（ TMA） and dynamic thermomechanical analysis（ DMA）. It was found that the decomposition temperature of raw silk produced from male silkworm varieties was about 316 ℃,slightly higher than that of raw silk produced from normal silkworm varieties（ 312 ℃）. The decomposition temperature range of raw silk produced from male silkworm varieties was 5- 7 ℃ smaller than that of raw silk produced from normal silkworm varieties,and the glass transition temperature was higher,showing superior thermal stability. The final weight loss rate of raw silk produced from male silkworm varieties was lower than that of raw silk produced from normal silkworm varieties after thermal decomposition. That is,raw silk produced from male silkworm varieties has more thermal decomposition residues.It is concluded that raw silk produced from male silkworm varieties has high storage modulus,good rigidity,and is hard to be deformed. It also has high loss modulus,loss tangent value,loss factor,and damping capacity.