【摘要】 为了合理地选择和使用热塑性淀粉(TPS)塑料，对TPS的屈服行为进行了研究。制备了TPS塑料，通过测试不同环境温度和拉伸速度下样品的力-位移曲线，研究了TPS屈服应力的温度依赖性和应变速率依赖性。结果表明，TPS的玻璃化转变温度约为80.9℃;TPS的屈服应力与温度呈线性下降关系，当拉伸速度为20 mm/min时，拟合曲线的斜率为-0.048 41,下降较快，温度依赖性最大；TPS的屈服应力σ_y与应变速率的对数lgε也具有线性关系，可表示为σ_y=A+Blgε,并且当温度为40℃时，屈服应力的应变速率依赖性最大，斜率达到最大，其值为4.688 81,即线性增加最大，此时，TPS的屈服应力σ_y与应变速率的对数lgε的关系可表示为σ_y=-3.761 2+4.688 81lgε,这与埃林理论的结果一致。更多还原

【Abstract】 In order to select and use thermoplastic starch(TPS) plastics reasonably, the yield behavior of TPS was studied. The temperature dependence and strain rate dependence of the yield stress of TPS were studied by measuring the force-displacement curves of the samples at different ambient temperatures and tensile speeds. The results showed the glass transition temperature of TPS was about 80.9 ℃, the yield stress of TPS decreased linearly with temperature, and when the stretching speed was 20 mm/min, the slope of the fitting curve was-0.048 41, which showed the fastest decline, that is, the temperature dependence was the largest. The yield stress σ_y of TPS also had a linear relationship with the logarithm lgε of the strain rate, which could be expressed as σ_y=A+Blgε, and the strain rate dependence of the yield stress was the largest at 40 ℃, and the slope was the largest at 4.688 81, that is, the linear increase was the largest. In this case, the relationship between the yield stress σ_y of TPS and the logarithm of the strain rate lgε could be expressed as σ_y=-3.761 2+4.688 81 lgε, which was consistent with the results of Eyring theory.更多还原