PAGAT型聚合物凝胶剂量计的高熔点优化

使用丙烯酰胺、明胶、交联剂、除氧剂、甲醛和琼脂糖等,在常氧条件下制备出四种不同配比的聚合物凝胶剂量计。根据U型管两端水平液面恒等原理,在32℃和60℃下比对筛选出具有较高熔点的凝胶剂量计,实验结果表明PAGAT加入适量甲醛所得的聚合物凝胶剂量计具有60℃以上的熔点,可以很好抵御环境温度的大幅度变化,并且有很好的剂量线性响应特性。

低熔点聚合物改性聚氨酯脲弹性纤维的结构与性能

为了改善聚氨酯脲弹性纤维的热粘合性能,采用物理混合的方法制备了低熔点聚合物/聚氨酯脲纺丝原液,然后经干法纺丝制得了低熔点聚合物改造聚氨酯脲弹性纤维;研究了改性聚氨酯脲弹性纤维的表面形貌,力学性能及热粘合性能。结果表明:改性前后的聚氨酯脲弹性纤维表面形貌没有变化;改性聚氨酯脲弹性纤维300%时的拉伸应力和断裂伸长率基本没有发现变化,断裂强力和弹性回复率分别下降了9.6%和6.0%;改性聚氨酯脲弹性纤维的热粘合性能有了显著地提高。

改善聚丙烯树脂性能用的成核剂评述

回顾了聚合物结晶形态研究的进程 ,综述了聚丙烯结晶形态的研究现状、成核剂对聚丙烯结晶过程和形态的影响及其与聚丙烯成型产品物性的关联 ,介绍了聚丙烯用成核剂品种、特点以及利用成核剂改善聚丙烯树脂成型产品性能的研究开发动向。

新纤维的油剂设计

给出了新纤维油剂研发时需考虑的问题,列举了要进行的基本测试,并以新纤维长丝和短丝为例说明油剂设计过程中各项考虑因素。

Pressure-volume-temperature and excess molar volume prediction of amorphous and crystallizable polymer blends by equation of state

In this work the statistical mechanical equation of state was developed for volumetric properties of crystalline and amorphous polymer blends.The Ihm-Song-Mason equations of state(ISMEOS) based on temperature and density at melting point(T_m and ρ_m) as scaling constants were developed for crystalline polymers such as poly(propylene glycol) + poly(ethylene glycol)-200(PPG + PEG-200),poly(ethylene glycol) methyl ether-300(PEGME-350) + PEG-200 and PEGME-350 + PEG-600.Furthermore,for amorphous polymer blends containing poly(2,6-dimethyl-1,4-phenylene oxide)(PPO) + polystyrene(PS) and PS + poly(vinylmethylether)(PVME),the density and surface tension at glass transition(ρ_g and γ_g) were used for estimation of second Virial coefficient.The calculation of second Virial coefficients(B_2),effective van der Waals co-volume(b) and correction factor(α) was required for judgment about applicability of this model.The obtained results by ISMEOS for crystalline and amorphous polymer blends were in good agreement with the experimental data with absolute average deviations of 0.84%and 1.04%,respectively.