A Dynamic Study of Crystallization of Poly(ε-caprolactone) and Poly(ε-caprolactone)/Poly(vinyl chloride) Blend
A Dynamic Study of Crystallization of Poly(ε-caprolactone) and Poly(ε-caprolactone)/Poly(vinyl chloride) Blend
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聚(ε-己内酯)和聚(ε-己内酯)/聚氯乙烯共混物结晶的动态研究
DOI：
10.1295/polymj.18.451
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发表时间：
1985
期刊：
影响因子：
2.8
通讯作者：
T. Ashida
中科院分区：
文献类型：
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作者：
S. Nojima;Hideki Tsutsui;Masaru Urushihara;W. Kosaka;N. Kato;T. Ashida
采用同步辐射小角x射线散射（SAXS）和显微观察方法，研究了聚ε-己内酯（PCL）的结晶及PCL与聚氯乙烯的相容性共混物。通过SAXS方法，在结晶过程中观察到样品中长周期产生的散射强度峰。峰的最大强度Im随着结晶时间tc的增加而增加，并在2τ1/2* （τ1/2*是Im达到Im(∞)/2所需的时间）时达到恒定值Im（∞）。纯PCL和共混结晶的τ1/2*值均随结晶温度的升高而急剧增大，且在相同温度下，共混结晶的τ1/2*值大于纯PCL。用Avrami方程分析了Im对tc的变化，共混物在每个tc下的指数n约为2，纯PCL在较高tc下的指数n约为2。对于低Tc的纯PCL， n随Tc的减小而增大。在纯PCL和共混物的显微观察中，球晶半径随tc的增加而线性增大，球晶的线性生长速率G随tc的增加而减小。τ1/2*对Tc的依赖性与1/G对Tc的依赖性是一致的。
The crystallization of poly(ε-caprolactone) (PCL) and a compatible blend of PCL with poly(vinyl chloride) were studied by a small angle X-ray scattering (SAXS) method with synchrotron radiation and by microscopic observation. By the SAXS method, the peak of the scattering intensity, arising from the long period in the sample, was observed during crystallization. The maximum intensity of the peak, Im, increased with crystallization time tc and reached a constant value Im(∞) at time 2τ1/2* (τ1/2* is the time necessary for Im to reach Im(∞)/2). The value of τ1/2* increased abruptly with an elevation of the crystallization temperature Tc for both pure PCL and the blend, and τ1/2* for the blend was larger than that for pure PCL at the same Tc. The change of Im against tc was analysed by the Avrami equation, the exponent n being about 2 for the blend at every Tc and pure PCL at higher Tc. For pure PCL at lower Tc, n increased with the decrease of Tc. In the microscopic observation of both pure PCL and the blend, the spherulite radius increased linearly with tc, and the linear growth rate G of spherulite decreased with Tc. A correspondence was found between Tc dependence of τ1/2* and that of 1/G.
DOI：
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发表时间：
1984
期刊：
--
影响因子：
--
作者：
高エネルギー物理学研究所
通讯作者：
高エネルギー物理学研究所