The reference matrix. The various influence of SIMA- and SIV-modified celluloses
The reference matrix. The distinct influence of SIMA- and SIV-modified celluloses upon PHB crystallinity and the different influence ofbe explained by the distinctive chemical compositions on the its thermal behavior can SIMA- and SIV-modified celluloses upon PHB crystallinity two its thermal behavior canandexplained by the different chemical compositions on the and modifiers; methacrylic be polymethacrylic pendant units have superior interaction with the PHB methacrylic and for the less reactive vinyl units group. Also, the two modifiers;matrix as opposedpolymethacrylic pendant silane have improved interaction action of unreacted SIV opposed towards the less reactive vinyl silane group. is addition, the with the PHB matrix as as a crosslinker in PHB can not be excluded. ThisIn in agreement using the slightly higher as a crosslinker in PHB can not be excluded. This isPHB/MC-SIVaction of unreacted SIV melting temperature and lower crystallinity on the in agreement MA the slightly larger melting temperature and reduced crystallinity also PHB/MC-SIVwith composite. The crystallization behavior of PHB Safranin Epigenetics composites wasof theinvestigated by SB 271046 MedChemExpress polarized light microscopy (POM), behavior of PHB composites was also investigated by MA composite. The crystallization as discussed under.polarized light microscopy (POM), as discussed under.Polymers 2021, 13, 3970 Polymers 2021, 13, x FOR PEER REVIEW12 of 19 12 of3.3.three. Polarized Optical Microscopy three.three.3. Polarized Optical Microscopy The formation of spherulites in PHB and in composites and their shape and size can The formation of spherulites in PHB and in composites and their shape and size is usually observed in the photos obtained with the polarized optical microscope presented in be observed in the photos obtained together with the polarized optical microscope presented in Figure 7. Figure 7.Figure 7. Polarized optical micrographs of PHB and composites with differently modified celluloses (0); scale bar 50 . Figure 7. Polarized optical micrographs of PHB and composites with differently modified celluloses (0); scale bar 50 .POM pictures show ring-banded spherulites with the characteristic Maltese cross in bothPOM pictures composite. In PHB, spherulites withsize varied among 60 andcross PHB and its show ring-banded the spherulites’ the characteristic Maltese 140 in both in composites among 20 and 180the spherulites’ size varied between 60 and 140 and PHB and its composite. In PHB, , with a greater proportion of smaller sized spherulites and in composites between 20 and 180 ,as observed in the histogramssmaller spheruin the with treated celluloses, with a greater proportion of attached towards the lites in the composites with treated celluloses, as observed nucleating impact of celluloses, representative POM images (Figure 7). This supports the inside the histograms attached towards the representative POM images (Figure 7). Thisis in agreement using the DSC final results. and from the modified celluloses particularly, which supports the nucleating impact of celluloses, and with the modified celluloses especially, that is in agreement with the DSC re3.three.4. sults. Dynamical Mechanical Evaluation The mechanical behavior of your composite films was investigated by DMA as well as the 3.3.4. Dynamical Mechanical Analysis storage modulus (E’) and tan variation with temperature are presented in Figure eight. The glass transition temperature of from the composite filmsfrom the tan vs. temperature curve, The mechanical behavior PHB (Tg ), determined was investigated by.