Y. C. Chern

National Taiwan University

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K. H. Hsieh

National Taiwan University

C. C. M.

Cochin University of Science and Technology

Wen‐Yen Chiu

National Taiwan University

J. L. Han

National Ilan University

D. C. Liao

Southwest Hospital

Sheng‐Mao Tseng

Taiwan Textile Research Institute

Ying‐Cheng Chiang

National Taiwan University

Ko‐Shan Ho

National Kaohsiung University of Science and Technology

K. S. Hoe

Yu‐Hsung Wang

Chung Yuan Christian University

Cooperative Institutions

National Taiwan University

National Tsing Hua University

Chung Yuan Christian University

National Taipei University of Technology

National Taiwan University of Science and Technology

National Science and Technology Council

National Taiwan University Hospital

Lunghwa University of Science and Technology

Fu Jen Catholic University

National Kaohsiung University of Science and Technology

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Swelling equilibrium and sorption kinetics of urethane‐modified bismaleimides elastomer

Journal of Polymer Science Part B Polymer Physics (1997)

D. C. Liao Y. C. Chern J. L. Han K. H. Hsieh

The swelling equilibrium and diffusion kinetics in various solvents of the maleimide-terminated polyurethanes (UBMIs) and of the triol and tetraol-crosslinked polyurethanes (PU) were studied. The polymer volume fraction of the UBMIs at swelling equilibrium is much higher than that of the tetraol-crosslinked PU networks for the same type of polyol used in the PU. It was explained by the high functionality of the UBMIs produced in the network structure. Furthermore, the molecular weight between crosslinks (Mc) has been calculated from the swelling model and the results exhibit good agreement with the proposed network structure. The early time sorption kinetic data were obtained to investigate the diffusion mechanism of the solvent in the networks. The solubility, diffusion coefficients, and permeability of the solvent in UBMI networks were found to be lower than in the multiol-crosslinked PU networks. © 1997 John Wiley & Sons, Inc. J Polym Sci B: Polym Phys 35: 1747–1755, 1997

Triol

Hildebrand solubility parameter

Volume fraction

Maleimide

10.1002/(sici)1099-0488(199708)35:11<1747::aid-polb8>3.3.co;2-c

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Citations (0)

Kinetic study on the poly(methyl methacrylate) seeded soapless emulsion polymerization of styrene. II. Kinetic model

Journal of Applied Polymer Science (1995)

Chia‐Fen Lee Wen‐Yen Chiu Y. C. Chern

Abstract A seeded soapless emulsion polymerization was carried out with poly(methyl methacrylate) (PMMA) as seeds, styrene as monomers, and potassium persulfate (K 2 S 2 O 8 ) as the initiator to synthesize the PMMA/polystyrene (PS) composite latex. The morphology of the latex particles was observed by transmission electron microscopy (TEM). It showed a core‐shell structure. A core‐shell kinetic model was proposed for the seeded emusion polymerization, in which the thickness of the shell was not constant. An increase of the conversion would increase the thickness of the shell. The entire course of polymerization could be divided into three regions: In the first region, the propagation rate constant ( K p ) and termination rate constant ( K t ) were kept constant at constant temperature. The kinetic data showed that the square root of polymer yield ( W ) was proportional to the reaction time. In the second region, the gel effect was considered and the termination rate constant ( K t ) was empirically modified. The K t would decrease with increasing the conversion. In the third region, both the gel effect and the glassy effect were considered; the propagation rate constant was also empirically modified. The prediction on the conversion and the number‐average molecular weight of polymers during the seeded emusion of polymerization on the basis of our core‐shell kinetic model fitted well with the experimental data. © 1995 John Wiley & Sons, Inc.

Emulsion polymerization

Polystyrene

Potassium persulfate

10.1002/app.1995.070570509

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Citations (15)

Interpenetrating polymer networks of polyurethane and epoxy

Journal of Materials Science (1994)

Y. C. Chern K. H. Hsieh C. C. M.Yingwei Gong

Interpenetrating polymer network

Polyacrylonitrile

10.1007/bf01171558

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Citations (18)

Interpenetrating polymer networks of bismaleimide and polyurethane-crosslinked epoxy

Journal of Applied Polymer Science (1998)

J. L. Han Y. C. Chern Kuanyi Li K. H. Hsieh

This study prepared an interpenetrating polymer network of bismaleimide and polybutylene adipate-based polyurethane-crosslinked epoxy (BMI/PU-EP IPN) using the simultaneous bulk polymerization technique. Infrared spectra analysis was also performed to identify the polyurethane-crosslinked epoxy (PU-EP). Also investigated herein were the mechanical properties including tensile strength, fracture energy, and Izod impact strength of various bismaleimide content in PU-EP matrix. In addition, differential scanning calorimetry and thermogravimetric analyses of the BMI/PU-EP IPN were conducted as well. Analyses results demonstrate that the bismaleimide was dissolved primarily in the polyurethane domains of the epoxy matrix to form a compatible system, thereby increasing the mechanical strength of the BMI/PU-EP IPNs. © 1998 John Wiley & Sons, Inc. J. Appl. Polym. Sci. 70: 529–536, 1998

Interpenetrating polymer network

Thermogravimetric analysis

10.1002/(sici)1097-4628(19981017)70:3<529::aid-app15>3.0.co;2-w

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Citations (47)

Kinetics of curing reaction of urethane function on base-catalyzed epoxy reaction

Journal of Applied Polymer Science (1998)

J. L. Han Y. C. Chern K. H. Hsieh Wen‐Yen Chiu C. C. M.

The kinetic study on the effect of aromatic-connected carbamate (Ar-carbamate) on the curing reaction of phenyl glycidyl ether (PGE) catalyzed by tertiary amine was carried out through thermal analysis of the reaction by differential scanning calorimetry (DSC). By isothermal DSC analysis, the consumption rate of the epoxide group of PGE was found to be a first-order reaction in the presence of aromatic-connected carbamate in the reaction. It was found that the reaction system has a low activation energy (Ea = 4.63 kcal/mol) as compared to the system without Ar-carbamate (Ea = 6.89 kcal/mol). A reaction mechanism was proposed for this reaction system. © 1998 John Wiley & Sons, Inc. J Appl Polym Sci 68:121–127, 1998

Carbamate

Reaction rate

10.1002/(sici)1097-4628(19980404)68:1<121::aid-app13>3.0.co;2-3

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Citations (10)

Damping properties of interpenetrating polymer networks of polyurethane‐modified epoxy and polyurethanes

Journal of Applied Polymer Science (1999)

Y. C. Chern Sheng‐Mao Tseng K. H. Hsieh

Interpenetrating polymer networks (IPNs) were prepared from polyurethane (PU)-modified epoxy with different molecular weight of polyol and polyurethanes based on the mixture of polydiol and polytriol by a one-shot method. Two types of PU-modified epoxy: PU-crosslinked epoxy and PU-dangled epoxy were synthesized, and the effects of the different molecular weights of polyol in the PU-modified epoxy/PU IPNs on the dynamic mechanical properties, morphology, and damping behavior were investigated. The results show that the damping ability is enhanced through the introduction of PU-modified epoxy into the PU matrix to form the IPN structure. As the molecular weight of polyol in PU-modified epoxy increases, the loss area (LA) of the two types of the IPNs increases. PU-dangled epoxy/PU IPNs exhibit much higher damping property than that of the PU-crosslinked epoxy/PU IPNs with 20 wt % of PU-crosslinked epoxy. © 1999 John Wiley & Sons, Inc. J Appl Polym Sci 74: 328–335, 1999

Interpenetrating polymer network

10.1002/(sici)1097-4628(19991010)74:2<328::aid-app14>3.3.co;2-n

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Citations (3)

Interpenetrating polymer networks of polyurethanes and epoxy resin, II. Compatibility and morphology

Die Angewandte Makromolekulare Chemie (1992)

K. H. Hsieh Ying‐Cheng Chiang Y. C. Chern Wen‐Yen Chiu C. C. M.

Abstract The interpenetrating polymer networks (IPN) of polyurethanes (PU) and a glycidyl ether of phenol formaldehyde (GEPF) were prepared by a simultaneous polymerization method. The dynamic mechanical properties and morphologies of the IPNs were investigated. It was found that multiphased morphology was formed in the PU/GEPF IPNs. With the PU based on polyester‐ or polyether‐type polyols, the dynamic mechanical analysis (DMA) of these IPNs exhibited various shifts in the loss moduli (E″) of the high and low temperature transition domains depending upon the types and molecular weights of the polyols employed in the PU. Three distinct transition domains were observed as the PU content increased up to a certain level.

Interpenetrating polymer network

10.1002/apmc.1992.051940102

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Citations (11)

Swelling equilibrium and sorption kinetics of urethane-modified bismaleimides elastomer

Journal of Polymer Science Part B Polymer Physics (1997)

D. C. Liao Y. C. Chern J. L. Han K. H. Hsieh

Triol

Volume fraction

Hildebrand solubility parameter

Maleimide

10.1002/(sici)1099-0488(199708)35:11<1747::aid-polb8>3.0.co;2-p

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Citations (12)

Interpenetrating polymer networks of polyurethanes and epoxy resin, I. Mechanical behavior

Die Angewandte Makromolekulare Chemie (1991)

K. H. Hsieh Ying‐Cheng Chiang Y. C. Chern Wen‐Yen Chiu C. C. M.

Abstract The interpenetrating polymer networks (IPNs) prepared from polyurethane (PU) and a glycidyl ether of phenol formaldehyde (GEPF) were synthesized by using a simultaneous polymerization method. The effects of PU molecular weight and amount on the mechanical property are discussed. For the PU/GEPF IPNs based on polyester‐type PU, as the PU content was increased, the tensile strength and fracture energy decreased, but the impact strength increased significantly. However, for the PU/GEPF IPNs based on polyether‐type PU, the extent of heterogeneity was decreased with decreasing molecular weight of polyether polyol in PU and the tensile strength and fracture energy were enhanced. The impact strength increased to a maximum value and then decreased when the PU content was further increased.

10.1002/apmc.1991.051930109

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Citations (7)

Effect of dihydroxydiphenyl ether on poly(ether ether ketone)

Journal of Polymer Research (1996)

K. H. Hsieh Y. C. Chern K. S. Hoe Yu‐Hsung Wang Bor‐Wen Chan

Orthorhombic crystal system

10.1007/bf01492898

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Citations (2)