Organic hybrid of chlorinated polyethylene and hindered phenol. I. Dynamic mechanical properties

ABSTRACT:We investigated the sound absorption characteristics of an organic hybrid material comprised of chlorinated polyethylene (CPE) as the matrix polymer and N,NЈ-dicyclohexyl-2-benzothiazolyl sulfenamide (DBS) as the second component of an organic low-molecular-weight compound. We found specific crystallites, obtained by annealing, that generated new absorption for a low-frequency sound in a CPE/DBS blend. We observed two sound absorption peaks, around 300 and 1000 Hz, in the annealed CPE/DBS (50 : 50 w/w) blends, whereas those peaks were not observed in the untreated sample. There were two kinds of crystals with different melting points in the annealed samples. It was confirmed that the crystals with the lower melting point brought about sound absorption at a low frequency. The crystals that had the lower melting point were smaller and/or more disordered than the crystals that had the higher melting point. We calculated the fraction of these two types of crystals from differential scanning calorimetry and wide-angle X-ray diffraction measurements. The annealing or reannealing temperature specified the fraction of the crystal with the lower melting point, and the obtained crystal fraction characterized sound absorption frequency. Therefore, it is possible to control the sound absorption frequency of an organic hybrid by heat treatment such as annealing.

Section: Introductionsupporting

confidence: 74%

Low‐frequency sound absorption of organic hybrid comprised of chlorinated polyethylene and N,N′‐dicyclohexyl‐2‐benzothiazolyl sulfenamide

Akasaka¹,

Tobusawa²,

Tominaga³

et al. 2005

“…Figure 1 displays the chemical structures of AO‐80, which shows the one with many hydroxyl groups and ester groups. Wu and his coworkers blended chlorinated polyethylene (CPE) and acrylic rubbers (ACM) with AO‐80 to prepare damping materials 12–14. Such hybrids exhibited two distinct relaxation transitions: (1) the glass transition associated with CPE in the matrix, and (2) the hydrogen bonding dissociation associated with AO‐80 in the particles.…”

Section: Introductionmentioning

confidence: 99%

The structure and dynamic properties of thermoplastic polyurethane elastomer/hindered phenol hybrids

Xiao

Zhao

Feng

et al. 2010

The organic hybrids of thermoplastic polyurethane (TPU)/hindered phenol (AO-80) were prepared through melt blending, which was followed by hot and cold pressing procedure. The microstructure and dynamic mechanical properties of the hybrids were systematically investigated through SEM, DSC, XRD, FTIR, DMA and a tensile tester. The experimental results indicated that AO-80 was completely dissolved in the matrix. The glass transition of the soft segments of TPU was found to shift to higher temperature with the amount of AO-80 increasing, whereas the glass transition of the hard segments exhibited nearly no evident change, indicating that AO-80 was selectively located in the soft region of TPU and the formation of the strong intermolecular interactions (hydrogen bonding) between AO-80 and the soft region of TPU. With the increase of AO-80 in the hybrids, the tand peak gradually shifted to higher temperatures and the maximal tand value increased from 0.4 to 1.6. Meanwhile, the glass transition temperature ranges broadened and the TA value increased greatly with the more content of AO-80. Because of the decrease of the hard segments amount in the hybrids, the tensile stress of these hybrids decreased, but still maintained at a high level. The hybrids were expected to have potential applications as high performance damping materials combined with good mechanical properties.

“…However, homopolymers usually exhibit narrow effective damping temperature ranges of only 20–30°C around their glass transition temperatures ( T g ), among which the polymers have pronounced dissipation of the mechanical energy as heat,1–7 based on the onset of coordinated chain molecular motions. Traditional methods of modification and broadening of the damping range often involve use of a multicomponent polymer system with partial compatibility, such as copolymer,8 mechanical blends,9 interpenetrating polymer networks,10–13 or other additives as modified crosslinking agents, plasticizers, fillers,14 and low‐molecular‐weight organic compounds 1, 7, 15, 16…”

Section: Introductionmentioning

confidence: 99%

Dynamic mechanical properties in blends of poly(styrene‐b‐isoprene‐b‐styrene) with aromatic hydrocarbon resin

2006

Self Cite

The damping properties in blends of poly (styrene-b-isoprene-b-styrene) (SIS) and hydrogenated aromatic hydrocarbon (C 9 ) resin were investigated by dynamic mechanical analysis. SIS exhibited two independent peaks of loss factor (tan d) corresponding to the glass transition of polyisoprene (PI) and polystyrene (PS) segments, respectively. The addition of hydrogenated C 9 resin had a positive impact on the damping of SIS. With the increasing softening point and content of the resin, the main tan d peak shifted to higher temperatures and the useful damping temperature range was broadened. Addition of mica or PS was found to widen the effective damping range evidently in the high-temperature region, especially when PS was mixed in the solid state. It was concluded that the dispersed PS domains played a role of reinforcing fillers at low temperatures and served as a polymer component with a tan d peak due to its glass transition at the high temperature.