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Zeng Z.,East China University of Science and Technology | Sun L.,East China University of Science and Technology | Xue W.,East China University of Science and Technology | Yin N.,East China University of Science and Technology | Zhu W.,Shanghai Tianyang Hotmelt Adhesives Co.
Polymer Testing | Year: 2010

The relationships between molecular weight and intrinsic viscosity were established for poly(1, 4-butylene adipate) (PBA) with the molecular weight Mw ≤ 20,000 in tetrahydrofuran at 298 K. Thus, two series of PBA samples having narrow and broad molecular weight distributions (MWD) were prepared by polymerization between 1,6-adipic acid and 1,4-butanediol. The number average molecular weights (Mn) of the samples were measured by end-group analysis. Size-exclusion chromatography (SEC) was used to determine average molecular weights (Mn, Mv, Mw and Mz). A numerical method for determination of Mark-Houwink-Sakurada (MHS) equation constants, a and K, was tested with success for the PBA samples, and the influences of polydispersity correction factor (qM H S) on the relationships were studied for PBA with narrow MWD(1.065-1.181) and broad MWD (1.75-2.327). © 2009. Source


Xiao X.,East China University of Science and Technology | Zeng Z.,East China University of Science and Technology | Xue W.,East China University of Science and Technology | Kong Q.,East China University of Science and Technology | Zhu W.,Shanghai Tianyang Hotmelt Adhesives Co.
Polymer Engineering and Science | Year: 2013

The isothermal crystallization kinetics and melting behaviors after isothermal crystallization of poly(butylene terephthalate) (PBT) and poly(butylene terephthalate-co-fumarate) (PBTF) containing 95/5, 90/10, and 80/20 molar ratios of terephthalic acid/fumaric acid were investigated by differential scanning calorimetry. The equilibrium melting temperatures of these polymers were estimated by Hoffman-Weeks equation. So far as the crystallization kinetics was concerned, the Avrami equation was applied and the values of the exponent n for all these polymers are in the range of 2.50-2.96, indicating that the addition of fumarate does not affect the geometric dimension of PBT crystal growth. Crystallization activation energy (ΔE) and nucleation constant (Kg) of PBTF copolymers are higher than that of PBT homopolymer, suggesting that the introduction of fumarate hinders the crystallization of PBT in PBTF. © 2012 Society of Plastics Engineers. Source


Ma X.,East China University of Science and Technology | Xue W.,East China University of Science and Technology | Zeng Z.,East China University of Science and Technology | Zhu W.,Shanghai Tianyang Hotmelt Adhesives Co.
Journal of Adhesion Science and Technology | Year: 2015

In this work, a new polyamide (PA155) was synthesized from higher purity dimer acid, sebacic acid, ethylenediamine, and piperazine, and the ternary blends were prepared by blending PA155 with LLDPE in the presence of the compatibilizer, maleic anhydride grafted linear low-density polyethylene (LLDPE-g-MAH). The weight ratio of PA155 to LLDPE of the samples was kept constant at 80/20 and the amount of LLDPE-g-MAH was varied at 0, 3, 6, 9, and 12 wt% over the total weight of the blend respectively. The scanning electron microscope and mechanical properties tests showed that the compatibility and the mechanical properties were improved with the increase in LLDPE-g-MAH content, and the blend containing 9.0 wt% LLDPE-g-MAH exhibits an optimal miscibility behavior and mechanical properties. The hot melt adhesives which were prepared from the ternary blends were assessed by 180°peel tests of Al/adhesive/polypropylene stack. The peeling strength for the sample containing 9.0 wt% compatibilizer (82.5 N/2.5 cm) is much more than that of the samples without compatibilizer (<20 N/2.5 cm). © 2015 Taylor & Francis Source


Zhou Y.,East China University of Science and Technology | Xue W.,East China University of Science and Technology | Zeng Z.,East China University of Science and Technology | Zhu W.,Shanghai Tianyang Hotmelt Adhesives Co. | Li Z.,Shanghai Tianyang Hotmelt Adhesives Co.
Journal of Adhesion Science and Technology | Year: 2015

A new amine-terminated nylon 6/66/1010 (AM-6/66/1010) copolyamide hot melt adhesive with the molecular weight of 21,000-96,000 Da was synthesized and blocked with 1-hexadecylamine. The AM-6/66/1010 samples were characterized by 1H-NMR spectroscopy, differential scanning calorimetry (DSC), thermal gravimetric analysis, and gel permeation chromatography. The 1H-NMR spectroscopy demonstrated that 1-hexadecylamine functions as blocking agent in this polymerization. The DSC thermograms showed that the extra peak (peak (II)) and the melting peak (peak (I)) of AM-6/66/1010 are moving left and the glass transition temperature of AM-6/66/1010 decreases as the mole ratio αH/C (1-hexadecylamine/total carboxyl) increases. The thermal gravimetric analysis indicated that AM-6/66/1010 hot melt adhesive has a high thermal stability. The peel strength of the test specimen obtained by hot melt glutinous lining of AM-6/66/1010 or AC-6/66/1010 and fabric 6535 (65% PET, 35% cotton) was studied using T-peel tests, and the results showed that the washable and dry-cleaning resistant of AM-6/66/1010 copolyamide hot melt adhesive is better than that of carboxyl-terminated nylon 6/66/1010 (AC-6/66/1010) copolyamide hot melt adhesive. © 2015 Taylor & Francis. Source


Sun L.,East China University of Science and Technology | Cao S.,East China University of Science and Technology | Xue W.,East China University of Science and Technology | Zeng Z.,East China University of Science and Technology | Zhu W.,Shanghai Tianyang Hotmelt Adhesives Co.
Journal of Adhesion Science and Technology | Year: 2016

Pentaerythritol diacrylate (PEDA) was synthesized by direct esterification from acrylic acid and pentaerythritol, and the reactive hot melt polyurethane adhesives (PURs) with high green strength were prepared from Poly(1,6-hexamethyleneadipate), PHA-3000, two kinds of Poly(propylene glycol) (PPG-1000 and PPG-4000) and PEDA as well as terpene-phenolic resin. Five samples of PURs with different weight percent (α) of PEDA (α = 0, 3, 5, 7, and 10 wt%), were obtained. The rheological properties, thermal stability, and mechanical properties of the samples were investigated. The results showed that the melt viscosity (η) and the storage shear modulus of the samples increase with the increase in α, while the thermal stability changes little. The bonding strength of the samples after 10 min, 30 min, and 48 h was assessed by 180° peel tests of Fabric 6535/adhesives/Fabric 6535 stacks. The results showed that the green strength after 30 min increases with the increase in α when α is not higher than 7 wt%. © 2016 Taylor and Francis. Source

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