利用原子力显微镜的一种新方法单分子力谱技术研究了聚丙烯酸单链的弹性性质，得到了聚丙烯酸链的拉力与拉伸曲线．其拉力与拉伸曲线可以通过修改的Ｌａｎｇｅｖｉｎ方程进行较好地拟合．结果表明聚丙烯酸链的弹性性质与长度线性成比例，聚丙烯酸链具有相同的Ｋｕｈｎ长度（０６４±００５ｎｍ）和链段弹性系数（１３０００±２０００ｐＮ／ｎｍ），充分表明我们位伸的是聚丙烯酸的单链，所测得的拉力拉伸行为是聚丙烯酸单链的弹性行为 Using a new method of atomic force microscopy, the single-molecule force spectrum technique, the elastic properties of polyacrylic acid single-stranded chains were studied. The tensile and tensile curves of polyacrylic acid chains were obtained. The tensile and tensile curves can be well fitted by the modified Langevin equation. The results show that the elastic properties of polyacrylic acid chains linearly proportional to the length, the polyacrylic acid chains have the same Kuhn length (064 ± 005 nm) and the elastic modulus (13,000 ± 2,000 pN / nm) Is a single chain of polyacrylic acid, the measured tensile  tensile behavior of polyacrylic acid single chain elastic behavior