Polylactide (PLA)-clay nanocomposites prepared by melt compounding in the presence of a chain extender

2012 ◽  
Vol 72 (5) ◽  
pp. 608-615 ◽  
Author(s):  
N. Najafi ◽  
M.C. Heuzey ◽  
P.J. Carreau
Keyword(s):  
Chain Extender ◽  
Clay Nanocomposites ◽  
Melt Compounding ◽  
A Chain

Synthesis and Characterization of Polyurethane/Clay Nanocomposites

2015 ◽  
Vol 1110 ◽  
pp. 73-76 ◽  
Author(s):  
Sau Leng Sin ◽  
Hong Yan ◽  
Jian Wei Xu
Keyword(s):  
Hydrogen Bonding ◽  
Chain Extender ◽  
Synthesis And Characterization ◽  
Clay Nanocomposites ◽  
Chain Extenders ◽  
A Chain

This paper describes synthesis of a series of polyurethane (PU)/clay nanocomposites by using two different chain extenders ethylenediamine (ED) and 1,3-diamino-2-propanol (DAP). By using DAP as a chain extender, PU/clay nanocomposites show not only the stronger inter-and intrachain interactions through hydrogen bonding, but also exhibit enhanced clay exfoliation as evidenced by the disappearance of clay diffraction at 2θ = 2.5-10°.

Effect of a chain extender on the properties of poly(lactic acid)/zinc oxide/copper chlorophyll acid antibacterial nanocomposites

2014 ◽  
pp. n/a-n/a ◽  
Author(s):  
Weihua Fan ◽  
Yue Zhao ◽  
Aijing Zhang ◽  
Yukun Liu ◽  
Yanxia Cao ◽  
...  
Keyword(s):  
Zinc Oxide ◽  
Lactic Acid ◽  
Chain Extender ◽  
Poly Lactic Acid ◽  
A Chain

scholarly journals Synthesis and Properties of Waterborne Polyurethane (WBPU)/Modified Lignin Amine (MLA) Adhesive: A Promising Adhesive Material

2016 ◽  
Author(s):  
Mohammad Mizanur Rahman ◽  
Md. Hasan Zahir ◽  
Han Do Kim
Keyword(s):  
Adhesive Strength ◽  
Weather Conditions ◽  
Waterborne Polyurethane ◽  
Chain Extender ◽  
Mixing Process ◽  
Adhesive Material ◽  
Lignin Amine ◽  
A Chain ◽  
Modified Lignin ◽  
Adhesive Materials

A series of waterborne polyurethane (WBPU)/modified lignin amine (MLA) adhesives was prepared using modified lignin amine (MLA) as a chain extender by a prepolymer mixing process. A successful Mannich reaction was achieved during the synthesis of MLA by reacting lignin with bis(3-aminopropyl)amine. Higher tensile strength, Young’s modulus and thermal stability were recorded for WBPU/MLA adhesives with higher MLA contents. The WBPU/MLA adhesive materials were used to coat PVC substrates. The adhesive strength increased with increasing MLA content. More importantly, the MLA also enhanced the WBPU/MLA coating in terms of adhesive strength at moderately high temperatures as well as under natural weather exposed conditions. The adhesive strength was essentially unaffected with 6.48 mole% MLA in the WBPU/MLA coating after exposure to natural weather conditions for 180 days.

Preparation and characterization of PET/clay nanocomposites by melt compounding

2011 ◽  
Vol 51 (6) ◽  
pp. 1178-1187 ◽  
Author(s):  
Hesam Ghasemi ◽  
Pierre J. Carreau ◽  
Musa R. Kamal ◽  
Jorge Uribe-Calderon
Keyword(s):  
Clay Nanocomposites ◽  
Melt Compounding

Modification of nylon-6 with poly (m-phenylene isophthalamide) via MDI as a chain extender

1993 ◽  
Vol 28 (18) ◽  
pp. 4862-4867 ◽  
Author(s):  
Ming-Fung Lin ◽  
Yao-Chi Shu
Keyword(s):  
Nylon 6 ◽  
Chain Extender ◽  
A Chain

Polymer/Clay Nanocomposites Produced by Dispersing Layered Silicates in Thermoplastic Melts

2021 ◽  
pp. 1002-1030
Author(s):  
S. S. Pesetskii ◽  
S. P. Bogdanovich ◽  
V. N. Aderikha
Keyword(s):  
Polymer Blends ◽  
Hybrid Composites ◽  
Structural Features ◽  
Layered Silicates ◽  
Clay Nanocomposites ◽  
Structure And Properties ◽  
High Modulus ◽  
Thermoplastic Polymers ◽  
Technological Factors ◽  
Melt Compounding

Results of the studies of technology, structural features and properties of polymer/clay nanocomposites (n-PCM) prepared by melt compounding of thermoplastic polymers are systematized. Special attention is given to the analysis of the effect of nanoclays modification with surfactants on properties of nanocomposites and preparation features of nanomaterials based on polar, non-polar thermoplastics and polymer blends. Effect of technological factors and special compounding regimes in the technology of n-PCM with advanced technical characteristics is considered. Results of the original studies of the structure and properties of the hybrid composites, filled by high modulus fibers in addition to nanoclays, are presented.

Rheology of Thermoplastic Polyurethanes

2007 ◽  
Author(s):  
Chang Dae Han
Keyword(s):  
Rheological Behavior ◽  
Thermoplastic Polyurethane ◽  
Complete Characterization ◽  
Chain Extender ◽  
Reaction Sequence ◽  
Molecular Weights ◽  
Soft Segments ◽  
Hard Segments ◽  
A Chain ◽  
Long Chain

Thermoplastic polyurethane (TPU) has received considerable attention from both the scientific and industrial communities (Hepburn 1982; Oertel 1985; Saunders and Frish 1962). Applications for TPUs include automotive exterior body panels, medical implants such as the artificial heart, membranes, ski boots, and flexible tubing. Figure 10.1 gives a schematic that shows the architecture of TPU, consisting of hard and soft segments. Hard segments, which form a crystalline phase at service temperature, are composed of diisocyanate and short-chain diols as a chain extender, while soft segments, which control low-temperature properties, are composed of difunctional long-chain polydiols with molecular weights ranging from 500 to 5000. The soft segments form a flexible matrix between the hard domains. TPUs are synthesized by reacting difunctional long-chain diol with diisocyanate to form a prepolymer, which is then extended by a chain extender via one of two routes: (1) by a dihydric glycol chain extender or (2) by a diamine chain extender. The most commonly used diisocyanate is 4,4’-diphenylmethane diisocyanate (MDI), which reacts with a difunctional polyol forming soft segments, such as poly(tetramethylene adipate) (PTMA) or poly(oxytetramethylene) (POTM), to produce TPU, in which 1,4-butanediol (BDO) is used as a chain extender. There are two methods widely used to produce TPU: (1) one-shot reaction sequence and (2) two-stage reaction sequence. The reaction sequences for both methods are well documented in the literature (Hepburn 1982). It should be mentioned that MDI/BDO/PTMA produces ester-based TPU. One can also produce ether-based TPU when MDI reacts with POTM using BDO as a chain extender. TPUs are often referred to as “multiblock copolymers.” In order to have a better understanding of the rheological behavior of TPUs, one must first understand the relationships between the chemical structure and the morphology; thus, a complete characterization of the materials must be conducted. The rheological behavior of TPU depends, among many factors, on (1) the composition of the soft and hard segments, (2) the lengths of the soft and hard segments and the sequence length distribution, (3) anomalous linkages (branching, cross-linking), and (4) molecular weight.

Synthesis and properties of a monolithic gradient polymer material based on polyurethane structures and 1,4-butanediol as a chain extender

2017 ◽  
Vol 59 (1) ◽  
pp. 12-26 ◽  
Author(s):  
E. S. Afanasyev ◽  
L. M. Goleneva ◽  
T. A. Matseevich ◽  
A. A. Askadskii
Keyword(s):  
Polymer Material ◽  
Chain Extender ◽  
A Chain
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