對苯二甲酸間苯二甲酸與乙二醇共聚酯結晶行為研究

Study of the Crystallization of Poly(ethylene terephthalate-co-isophthalate)

張志卿

指導教授 ： 余子隆教授

元智大學/工程學院/化學工程與材料科學學系/碩士(1997年)

摘要

本論文以DSC熱分析儀及光散射研究聚對苯二甲酸乙二酯及二種共聚酯(對苯
二甲酸(TPA)-間苯二甲酸(IPA)與乙二醇之共聚酯)的恆溫結晶行為。其中兩種
共聚酯的IPA/TPA摩耳比分別為2/100及12/100。恆溫結晶的溫度Tc範圍在150~
195℃之間。我們選擇數個溫度將聚酯樣品置放於DSC樣品槽中作恆溫結晶。結
晶完成後再以10℃/min之升溫速率作DSC掃描。利用DSC恆溫結晶數據我們計算
Avrami eqn.的結晶參數。而DSC的升溫掃描數據則用來計算結晶平衡融點Tmo。
利用Tmo數據及恆溫結晶數據我們計算了聚酯的結晶成核參數(Kg)。利用光散射
我們測定了三種聚酯在不同結晶溫度的結晶粒徑對結晶時間的變化。聚酯的DSC
升溫數據之結晶融點顯示在恆溫結晶時有二~三個結晶粒徑分佈，此結果與一般
文獻的數據相似。光散射數據所計算得之晶體粒徑分佈數比DSC之粒徑分佈數略
多。由於DSC升溫過程中使得原有之晶體融熔，分子運動重新排列產生新的融點
較高的結晶粒子。原有晶體的融解是吸熱現象，而分子重新排列長晶是放熱現象
，二者互相抵消。所以DSC升溫所得的結晶融解吸熱峰解析度比光散射數據差。
比較DSC與光散射的結晶成長速率、結晶起始時間，二者大致吻合。聚酯的結晶
粒徑，結晶速率大約隨著IPA含量增加而遞減。

關鍵字

聚對苯二甲酸乙二酯 ； 對苯二甲酸-間苯二甲酸乙二醇共聚酯 ； DSC ； 光散射 ； 結晶

並列摘要

Differential scanning calorimetry (DSC) and light scattering
were used to study the crystallization behavior of poly(ethylene
terephthalate) and two copolyesters，poly(ethylene terephthalate
-co-isophthalate).The molar ratio of isophthalate/terephthalate
of these two copolyesters were 2/100 and 12/100 . Isothermal
crystallization was carried out in a temperature (Tc) range of
150~190℃.The DSC isothermal crystallization data were used to
calculate Avrami equation parameters.After completing DSC isothermal
crystallization ，the polyester sample was heated from Tc to 300℃
with a heating rate of 10℃/min?The nonisothermal DSC data were
used to calculate the crystalline equilibrium melting temperature
(Tm0) . Using the Tm0 and isothermal crystallization data,we also
calculate nucleation parameter (Kg) .Light scattering was used to
measure the variation of the radius of polyester crystalline with
crystallization time at various crystallization temperature.Multiple
light scattering intensity peaks and multiple endothermic peaks of
nonisothermal DSC scan were observed in this study.Those results
were consistentwith the literature report of DSC crystalline data.
However,owing to the melting of original crystalline and molecular
reorganization to form new high melting temperature crystalline during
nonisothermal DSC scan.The sensitivity of DSC is lower than that of
light scattering method.The data of DSC and light scattering were
consistent with each other.The radius of crystal and crystalline
growth rate decreased with increasing isophthalate content of polyester.

並列關鍵字

poly(ethylene terephthalate) ； poly(ethylene terephthalate-co-isophthalate) ； DSC ； light scattering ； crystallization

參考文獻

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