Effect of side-chain length

In order to examine the effects of the side chain length, chemically prepared [2] samples of poly(3-hexylthiophene) (P3HT), poly(3-octylthiophene) (P30T) and poly(3-dodecylthiophene) (P3DDT) were used, Wide-angle x-ray 

---

In a further study, the effects of side chain length and lanthanide salt were investigated [78]. It was found that the chain length only plays a minor role and that the phase transition temperatures to the Colh and the isotropic phase remain... 

Effect of Side Chain Length. The side chain bound to the cation also affects the Tm due to flexibility and excluded volume effects. To discuss the relation between side chain structure and Tm, the onium cation structure was fixed. The relation between the side chain structure and the thermal properties of imidazolium salts has already been reported by Seddon et al. [16, 17]. The effect of alkyl chain length of 1-alkyl-3-methylimidazolium tetrafluoroborate on the phase transition temperatures is... 

Fig. 10. Effect of side chain length in the amino acid moiety of polydepsipeptides on the in vivo degradability...

System I has been modeled with both Nafion and SSC PFSA membrane to stndy the effect of side chain length on the morphology. The interfacial systems have been stndied nsing Nafion. 

The validity of MD simulation is impacted by the choice of system, interaction potential and algorithm implemented. We first discuss the choice of system. In this work we chose to simulate Nafion with an equivalent weight (EW) of 1144 g/mol, which is a practically reasonable EW. In order to have a direct comparison of the effect of side chain length, SSC PFSA polymer electrolyte was simulated with an EW of 978 g/mol. (Commonly used SSC iono-mer has an EW 800 g/mol). The repeat units of these PFSA membranes are shown in Fig. 3. These two materials have the same backbone separating side chains thus the only differentiating feature is side chain length. 

Effect of Side Chain Length for Precursor. Figure 2 shows both the storage modulus, G, and loss modulus, G", as a function of temperature for the LSC 1140 EW and SSC 800 EW polymers in the thermo-... 

Figure 6. Effect of side chain length and mole percent comonomer on the percent crystallinity by WAXS.

Figure 15. Effect of side chain length on the dynamic mechanical behavior of the sodium sulfonate polymer.

Camaioni, N. et al., Polyalkylthiophene-based photodetector devices Effect of side-chain length on the device performance. Mater. Sci. Eng. C-Biomimetic Supramolec. Syst. 15, 261-263, 2001. 

E. E. Giirel, Y. Pang, and E. E. Karasz. Luminescence properties of modified poly(m-phenylenevinylene)-u/i-(p-phenylenevinylene) Effects of side-chain length, blending and device configuration. Thin Solid Films, 417 (1-2) 147-150, September 2002. 

ISH Ishizone, T., Seki, A., Hagiwara, M., Han, S., Yokoyama, H., Oyane, A., Deffieux, A., and Carlotti, S., Anionic polymerizations of oligo(ethylene glycol) alkyl ether methacrylates Effect of side chain length and co-alkyl group of side chain on cloud point in water, Macromolecules, 41, 2963, 2008. 

Subianto S, Cavaliere S, Jones D J and Rozidre J (2013), Effect of side chain length on the electrospinning of perfluorosulfonic acid ionomers . Polymer, 51,118-128. 

Zhang B, Grohn F, Pedersen JS et al (2006) Conformation of cylindrical brushes in solution effect of side chain length. Macromolecules 39 8440-8450. doi 10.1021/ma0613178... 

Table 2.1 Summary of previous work on effect of side-chain length on field effect mobility for regioregular poly(3-alkylthlophene)s...

Analysis of the proton titration curves of these polyacids according to a treatment first applied to ionic polypeptides leads to thermodynamic parameters for the (hypothetical) conformational transition at zero charge. The effect of side-chain length, temperature, ionic strength, and the presence of protein dena-turants on these parameters has been studied. 

Nakanishi, E., Y. Shimiru, K. Ogura, S. Hibi and T. Hayashi, Effects of side chain length on membrane properties of copoly(N-hydroxyalkyl L-glntamine) hydrogels, Polymer Journal, 23 (1991) 1061-1068. Okajima, S., A. Ando, H. Shinoyama and T. Fujii, Purification and characterization of an extracellular chitosanase produced by Amycolatopsis sp. CsO-2, Journal c>f Fermentation and Bioengineering, 77 (1994) 617-620. 

Svensson, M., Helgee, B., Skarp, K., Hermann, D., and Andersson, G., Chiral liquid crystalline side-chain polymers effects of side-chain length on physical properties, Ferroelectrics, 181, 319-326 (1996). 

Differential thermal analysis has been used to study the effect of side-chain length in polymers on melting point, and the effect of heating rate of polymers on their melting point. DSC has been used to evaluate multiple peaks in polystyrene (PS) [23-25]. 

Table 1.1 Effect of side chain lengths and properties on phase transition temperature (LCST) of poly(iV-suhstituted acrylamide) polymers...

The values for the methacrylate series show the effect of side chain length already observed. The other polymers do not fit irtto any comparative series. They show that a low Tg is generally associated with a high frequency for the transition zone, but this is not the only controlling parameter as evidenced by a comparison of polyisobutylene and unvulcanized Hevea rubber at 298°K. Although Tg is nearly the same for these two, the transition lies at higher frequencies by nearly three logarithmic decades in the rubber. Such differences will be discussed in more detail in terms of the monomeric friction coefficient in Section B below. 

Hou H, Reuning A, Wendorff JH, Greiner A (2000) Tuning of the pitch height of thermotropic cellulose esters. Macromol Chem Phys 201(15) 2050-2054 Huang B, Ge JJ, Li Y, Hou H (2007) Aliphatic acid esters of (2-hydroxypropyl) cellulose—effect of side chain length on properties of cholesteric liquid crystals. Polymer 48(l) 264-269 Isogai A, Saito T, Fukuzumi H (2011) TEMPO-oxidized cellulose nanofibers. Nanoscale 3(l) 71-85... 

---