通过力学性能和差示扫描量热(DSC)测试对玻璃态聚碳酸酯(PC)物理老化和应变老化进行了研究.实验结果表明,应变老化试样的σy随t的延长而增大,并且ε越大,σy随时间的变化越大.在相同的老化时间内,不仅是淬火应变老化试样,而且退火应变老化试样的σy值亦高于物理老化试样,说明材料由韧性转变为脆性.而DSC测试表明,淬火应变老化试样在Tg附近出现的吸热峰值大于物理老化试样的吸热峰值,这一结果与在准平衡状态下,即退火应变老化试样时所得到的结果相似,说明应变老化试样形成了与物理老化相似的凝聚缠结之外,还有部分能量储存在分子链内部的特异结构.
参考文献
| [1] | Yukuo NANZAI;Akihiro MIWA;Shan ZI CUI .Mechanical and Thermal Analysis of Aging in Strained Polymethyl Methacrylate[J].JSME International Journal, Series A. Solid mechanics and material engineering,1999(4):479-484. |
| [2] | Slobodian P;Riha P;Rychwalski RW;Emri I;Saha P;Kubat J .The relation between relaxed enthalpy and volume during physical aging of amorphous polymers and selenium[J].European Polymer Journal,2006(10):2824-2837. |
| [3] | Shan Zi CUI;Yukuo NANZAI .Aging in Quenched Poly(methyl methacrylate) under Inelastic Tensile Strain[J].Polymer Journal,2001(5):444-449. |
| [4] | Nanzai Y.;Cui SZ.;Miwa A. .Aging in fully annealed and subsequently strained poly(methyl methacrylate)[J].Polymer Journal,2000(1):51-56. |
上一张
下一张
上一张
下一张
计量
- 下载量()
- 访问量()
文章评分
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%