Thermal analysis, glass transition temperature and rheological behaviour of emulsion copolymers of methyl methacrylate with styrene | Zendy

Zhang Liucheng | Zendy; Liu Guodong | Zendy; Ji Rongqin | Zendy; Yao Yanmei | Zendy; Qu Xiongwei | Zendy; Yang Liting | Zendy; Gao Jungang | Zendy

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Thermal analysis, glass transition temperature and rheological behaviour of emulsion copolymers of methyl methacrylate with styrene

Author(s) -

Zhang Liucheng,

Liu Guodong,

Ji Rongqin,

Yao Yanmei,

Qu Xiongwei,

Yang Liting,

Gao Jungang

Publication year - 2003

Publication title -

polymer international

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.592

H-Index - 105

eISSN - 1097-0126

pISSN - 0959-8103

DOI - 10.1002/pi.1014

Subject(s) - copolymer , glass transition , polymer chemistry , methyl methacrylate , materials science , differential scanning calorimetry , rheology , monomer , thermogravimetric analysis , styrene , thermodynamics , polymer , chemistry , composite material , organic chemistry , physics

Poly(MMA‐ ran ‐St) samples were synthesized under monomer‐starved conditions (drop feeding method) by emulsion copolymerization. Their thermostability was determined by thermogravimetric analysis. The glass transition temperature ( T g ) of the copolymers was determined by differential scanning calorimetry (DSC) and torsional braid analysis (TBA). The results showed that the MMA–St copolymers exhibit an asymmetric T g versus composition curve, which could not be interpreted by Johnston's equation, taking the different contributions of the diads to the T g of the copolymer into consideration. A new sequence distribution equation taking into account the different contributions of the triads was proposed to predict the copolymer T g . The new equation fitted the experimental data exactly. The T g determined by torsional braid analysis (TBA) is higher than the one determined by DSC, but the difference is not constant. The rheological behaviour of the copolymers was also studied and T gTBA ‐ T gDSC increased with the increasing flow index of the copolymer. © 2003 Society of Chemical Industry

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