Characterization of Morphologies of Compatibilized Polypropylene/Polystyrene Blends with Nanoparticles via Nonlinear Rheological Properties from FT-Rheology

被引:82
作者
Salehiyan, Reza [1 ]
Yoo, Youngjae [2 ]
Choi, Woo Jin [3 ]
Hyun, Kyu [1 ]
机构
[1] Pusan Natl Univ, Sch Chem & Biomol Engn, Pusan 609735, South Korea
[2] Korea Res Inst Chem Technol, Div Adv Mat, Taejon 305600, South Korea
[3] Korea Res Inst Chem Technol, Chem Mat Solut Ctr, Taejon 305600, South Korea
基金
新加坡国家研究基金会;
关键词
FOURIER-TRANSFORM RHEOLOGY; IMMISCIBLE POLYMER BLENDS; INTERFACIAL-TENSION; MODEL; VISCOELASTICITY; COALESCENCE; EVOLUTION; SIZE;
D O I
10.1021/ma500700e
中图分类号
O63 [高分子化学(高聚物)];
学科分类号
070305 ; 080501 ; 081704 ;
摘要
Linear and nonlinear viscoelastic properties under dynamic oscillatory shear flow were used to investigate the effects of compatibilization on polypropylene (PP)/polystyrene (PS) blends. Two different nanoparticles (organo-modified clay and fumed silica) were used at various concentrations. To analyze nonlinear stress under large amplitude oscillatory shear (LAOS) flow, nonlinearity (I-3/1) was calculated from FT-rheology. To quantify the degree of dispersion of different particles at various concentrations, a new parameter, nonlinear linear viscoelastic ratio (NLR equivalent to normalized nonlinear viscoelasticity/normalized linear viscoelasticity), was used. The relationship was determined between NLR value and PS droplet size in the PP matrix. From the TEM images, clay was located mostly at the interface or partially inside the PS drops, thereby reinforcing the compatibilization effect. Therefore, clay increased the dispersion morphologies of the PP/PS blends. In contrast, fumed silica was located mostly inside the PS droplets, which means the morphologies of PP/PS blends were not improved. Linear viscoelasticities of both PP/PS/clay and PP/PS/silica showed improvements at elevated particle concentrations. NLR values for the PP/PS/Clay blends were larger than 1 (NLR > 1), whereas NLR values for the PP/PS/silica blends were less than 1 (NLR < 1). Therefore, NLR could be classified into two categories depending on morphology. Based on these results, NLR can be used to distinguish between the effects of two different types of nanoparticles on the morphologies of PP/PS blends.
引用
收藏
页码:4066 / 4076
页数:11
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