The effect of citrate ester plasticizers on the thermal and mechanical properties of poly(DL-lactide)
The effect of citrate ester plasticizers on the thermal and mechanical properties of poly(DL-lactide)
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DOI：
10.1002/app.37600
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发表时间：
2013-02-05
影响因子：
3
通讯作者：
DeBarra, Eamonn
中科院分区：
文献类型：
--
作者：
Harte, Imelda;Birkinshaw, Colin;DeBarra, Eamonn
以柠檬酸三乙酯、柠檬酸三丁酯和柠檬酸乙酰三丁酯为增塑剂，制备了非晶态聚(D，L-丙交酯)。通过差示扫描量热仪(DSC)、动态力学热分析和拉伸试验对所得共混物的组成进行了分析，以考察共混物的性能。用示差扫描量热法测定了共混物的玻璃化转变温度(T(G)S)，并与理论计算的T(G)S进行了比较，结果表明，随着增塑剂含量的增加，共混物的玻璃化转变温度降低，增塑剂效率随柠檬酸酯相对分子质量的增加而提高。然而，在增塑剂含量较高的共混物中，随着相对分子质量的增加，共混物也出现了不相容的情况。理论结果与实验结果在可混溶的组成上是可比较的。随着增塑剂含量的增加，聚合物的延展性增加，强度降低。在PDLLA中加入10wt%的增塑剂，拉伸强度下降50%以上，且随着增塑剂浓度的增加，降幅更大。(C)2012年威利期刊公司J.Appl。波兰姆。SCI。127：1997-2003,2013
Citrate esters triethyl citrate, tributyl citrate, and acetyl tributyl citrate were used as plasticizers for amorphous poly(D,L-lactide) (PDLLA). The resultant compositions were analyzed by means of differential scanning calorimetry (DSC), dynamic mechanical thermal analysis, and tensile testing to investigate the properties of the blends. Glass transition temperatures (T(g)s) obtained by DSC were also compared to theoretically calculated T(g)s. Increasing plasticizer content decreased the resultant T-g of the blend with plasticizer efficiency enhanced as the molecular weight of the citrate ester increased. However, in blends with high plasticizer content, a lack of miscibility also occurred with increased molecular weight. Theoretical results were comparable with those obtained experimentally at compositions, which were miscible. Increasing plasticizer content increased the ductility and decreased the strength of the polymer. The addition of 10 wt % plasticizer to PDLLA decreased tensile strength by over 50% with the deterioration larger at higher concentrations of plasticizer. (c) 2012 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 127: 1997-2003, 2013