Phase behavior, nucleation and optical properties of the binary system isotactic polypropylene/N,N′,N"-tris-isopentyl-1,3,5-benzene-tricarboxamide
Phase behavior, nucleation and optical properties of the binary system isotactic polypropylene/N,N′,N"-tris-isopentyl-1,3,5-benzene-tricarboxamide
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DOI：
10.1016/j.polymer.2005.08.053
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发表时间：
2006-01-01
期刊：
影响因子：
4.6
通讯作者：
Schmidt, HW
中科院分区：
文献类型：
--
作者：
Kristiansen, PM;Gress, A;Schmidt, HW
本文用差示扫描量热法（DSC）和光学显微镜研究了等规聚丙烯（i-PP）和N，N '，N“-三异戊基-1，3，5-苯三甲酰胺（1）组成的二元体系在整个添加剂浓度范围内的相行为。从熔融和结晶研究中获得的数据构建实验相图，并提出了一个简单的monochromatic，非常类似于以前研究的二元体系i-PP/1，3：2，4-双（3，4-二甲基亚苄基）山梨醇（DMDBS）。与后者相反，发现本体系i-PP/1中的结晶温度在所用的最低添加剂浓度下已经增加到接近120 T，并且在进一步增加添加剂浓度下保持恒定。在升高的温度下观察到包含超过类似于2wt%的1的i-PP/1混合物的液-液相分离。对i-PP/1体系的光学性质的研究表明，在高达0.15重量%的浓度范围内，注塑板的雾度和透明度值分别逐渐降低和增加。在0.15和1重量%之间发现了一个相当浓度无关的光学性质的中间区域，然后在浓度超过2重量%时雾度迅速增加。(c)2005爱思唯尔有限公司保留所有权利。
The phase behavior of the binary system consisting of isotactic polypropylene (i-PP) and N,N',N''-tris-isopentyl-1,3,5-benzenetricarboxamide (1)-a selected member of a class of novel, versatile 'designer' nucleating/clarifying agents-was investigated over the entire additive concentration range by means of differential scanning calorimetry (DSC) and optical microscopy. Experimental phase diagrams were constructed from data obtained in melting and crystallization studies, and a simple monotectic is advanced, very similar to the previously studied binary system i-PP/1,3:2,4-bis(3,4-dimethylbenzylidene) sorbitol (DMDBS). In contrast to the latter, the crystallization temperature in the present system i-PP/1 was found to increase to similar to 120 T already at the lowest additive concentration employed and remained constant at further increasing additive concentration. Liquid-liquid phase separation was observed at elevated temperatures for i-PP/1 mixtures comprising more than similar to 2 wt% of 1. A study on the optical properties of the i-PP/1 system revealed that the values for haze and clarity of injection-molded plaques progressively decreased and increased, respectively, in the concentration range up to 0.15 wt%. An intermediate region of fairly concentration-independent optical properties was found between 0.15 and 1 wt%, followed by a rapid increase in haze at concentrations exceeding 2 wt%. (c) 2005 Elsevier Ltd. All rights reserved.